História stránky

...

Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Scheduler in Siemens Desigo devices
Scheduler in Delta Controls devices
Information about events
Information about alarms
Comment on the address cache
Comment on Delta Controls devices
Comment on E-DDC3.1 devices
Comment on Siemens Desigo devices
Comment on Klimasoft MBG-MSTP devices
Comment on iLON 10 Ethernet adapter
Comment on BACnet MS/TP implementation
Comment on BBMD (BACnet Broadcast Management Devices) support
Tell commands
Literature
Changes and modifications
Document revisions

Kotva
typy_verzie typy_verzie

Supported device types and versions

...

The BACnet communication protocol (Building Automation and Control Networks) implements ANSI/ASHRAE 135-2001 standard.
This implementation was tested with the following devices:

...

Kotva
komunikacna_stanica komunikacna_stanica

Communication station configuration

...

• Kotva
  requesttype requesttype

  Request type: Reading and writing of the object properties may be done in several ways:

  • Kotva
    readproperty readproperty

    ReadProperty - a periodical reading of object property as request-response. A polling period is configured on the Time parameters tab of station. TheReadProperty-Request message is used for the request and the ReadProperty-Ack message is the response from the device. The periodic reading burdens the network and is ineffective. That is why, if the device supports the sending of change data, we recommend you to use SubscribeCOV or SubscribeCOVProperty requests.
    The ReadProperty-Request message is sent if the Subscribe/read checkbox is checked.
  • ReadPropertyMultiple - the functionality is similar to the previous parameter. Unlike ReadProperty, more object properties are sent in one request/response, so communication is much more effective. TheReadPropertyMultiple-Request message is used for the request and the ReadPropertyMultiple-Ack message is the response from the device.
    The ReadPropertyMultiple-Request message is sent if the Subscribe/read checkbox is checked.
  • WriteProperty - the WriteProperty-Request message is used for writing the values. The Application tag parameter must be specified as well. If Subscribe/read is checked, the written value is verified by reading from the station using the ReadProperty-Request message after writing.

  • Kotva
    subscribecov subscribecov

    SubscribeCOV - activation of reading of object value when they change. If the Subscribe/read checkbox is checked, after starting, the KOM process sends the SubscribeCOV-Request message which asks the device to send information about the change of object value. You can specify whether the device will send the confirmed notifications (ConfirmedCOVNotification-Request message) or the unconfirmed ones (UnconfirmedCOVNotification-Request). The confirmed notification requires an explicit confirmation from the KOM (the BACnet-SimpleACK-PDU message), so puts more load on the network. However, the probability that the notification will be lost is lower than in case of using unconfirmed notifications (if the device does not receive a confirmation, it repeats the message).
    
    Note 1: Besides the dynamic registration by the SubscribeCOV-Request message, some devices can support also a static one (it is saved in the configuration). So the registration is not required and the checkbox Subscribe/read may be left unchecked.
    Note 2: The registration can be sent at regular intervals (e.g. because of a potential failure of the device power supply). You can set this interval on the station - the Resubscribe interval parameter.
    Note 3: SubscribeCOV-Request messages (and also SubscribeCOVProperty-Request messages, see the following point) are also sent after the connection with the station is re-established (after a failure or after switching from the StOFF state to the StOn).

  • Kotva
    subscribecovproperty subscribecovproperty

    SubscribeCOVProperty - the functionality is similar to SubscribeCOV. Moreover, you can specify the Property identifier (so you can monitor also the changes of other object properties than the present value) and Increment - a size of increment which causes the change to be sent (i.e. a dead band).
    The SubscribeCOVProperty-Request message is sent.
    
    Note: The Siemens PXC64-U device did not support the Increment parameter.

  • Kotva
    whois whois

    WhoIs - the identification message Who-Is-Request to detect the type of Device Object in a device. The I-Am-Request message is the response (it contains the iAmDeviceIdentifier, maxAPDULengthAccepted, segmentationSupported, and vendorID fields). If the I/O tag is TxtI, this information is extracted to the value of the I/O tag in a text form. After you identify the Device Object, you can configure the I/O tag for reading the property object-list of this Device Object. If the device implements this property, it returns the list of identifiers of all objects which it contains. Then you can query the properties of these objects (object-name, location, description, present-value ..)
    
    Note: For Siemens PXC64-U you must set the Array index and then read the property object-list. Array index=0 defines the number of array elements, Array index=1 up to N enables the access to the individual elements.

  • Kotva
    whohas whohas

    WhoHas - the identification message Who-Has-Request to detect the object name from the object identifier or vice versa. The response is the I-Have-Request message (it contains the fields deviceIdentifier, objectIdentifier, and objectName). The Who-Has-Request message is sent only once when initialization of I/O tag (or after the TELL command SETPTADDR). It is intended for the transfer between names and identifiers of objects.
    The message Who-Has-Request will contain either name or identifier of the object depending on whether the Address type has been configured as Name or Object type+Instance in I/O tag.
    If Subscribe/read is checked, you can use the information from the BACnet cache, which is much faster than detection from the communication.

  • Kotva
    readwritescheduler readwritescheduler

    ReadWriteScheduler - the ReadProperty-Request message is used for the request, the WriteProperty-Request message is used for write (it writes N time-value pairs). The configuration is used for the reading and writing of objects of schedule type, see the Scheduler in Siemens Desigo devices paragraph.

  • Kotva
    geteventinformation geteventinformation

    GetEventInformation: detection of objects that are in alarm or error state or they need to be acknowledged, see the section Information about events.

  • Kotva
    acknowledgealarm acknowledgealarm

    AcknowledgeAlarm: the acknowledgment of alarms that have been read by the GetEventInformation request. See the section Information about alarms. I/O tag must be the text output (TxtO).

• Kotva
  addresstype addresstype

  Address type: Each object in the BACnet protocol is addressed by an Object identifier. When designing the application in the Desigo system, the objects are represented by a name, but the object address is not accessible and can vary following the changes of application. On the other hand, the Delta Controls devices contain the objects whose addresses are defined by the author of the application. For this reason, there are two ways how to define the address of I/O tag which corresponds to two Address type:
  • Name: enter the object name. A type of object and instance number is queried dynamically from the communication. To avoid the overloading of communication lines when starting the KOM process, data is stored in a BACnet cache.
  • Object type + Instance: enter the type of object and an instance number. This is recommended for BACnet objects with constant addresses.
• Object type: type of objects, whose properties will be read/written. You can use the predefined types or write the number of a new type of object which has been defined by a producer. The type of object is a 10-bit number.
• Instance: an object identification number within the object type. Each object has a unique Object Identifier in the device, which is a pair [Object type, Instance].

• Kotva
  objectname objectname

  Object Name: name of the object, when Address type = Name, i.e. it means the I/O tag address [Object type, Instance], is detected dynamically from the communication. Object Name must be specified exactly, i.e. spaces in the beginning and at the end are not tolerated, and the upper and lower case letters must correspond to the object name that is stored in the BACnet device.
• Property type: type of property - only PropertyIdentifier is specified for Simple, and both PropertyIdentifier and Complex address must be specified for Complex. The complex type of property is necessary for the parsing of OEM-extended standard messages (items of 'Abstract Syntax & Notation' type). When sending the ReadProperty-Request, ReadPropertyMultiple-Request, SubscribeCOV-Request, and  SubscribeCOVProperty-Request messages, the Complex address is ignored.
• Property identifier: identifier of an object property. You can use the predefined properties or configure a numeric identifier of new property which was defined by the OEM manufacturer. The type of property identifier is Enumerated Value, the properties 0-511 are reserved for BACnet, the numbers from 512 to 4194303 can be used by the OEM manufacturer.
• Array index: some properties may be defined as arrays of values. In this case, a particular item of an array can be read or written.

• Kotva
  application_tag application_tag

  Application tag: it must be specified when writing the value (Request type=WriteProperty) and possibly for other types of requests if the parsed response contains context tags which application type is unknown because it is the extension of messages defined by the OEM manufacturer. The exception is an output tag of text type that is considered to be 'AnyTree', if the application tag is unspecified, and it can be used to write any user-specified ASN sequence.
  
  Note: If the value is Invalid, it is not written as the defined Application tag, but as Application tag "Null".

• Kotva
  complex_address complex_address

  Complex address: address of a tag in a 'tree' in connection with the extension of messages that have been defined by the OEM manufacturer.
  Example of address: [1].[3].2.1
  Description:
  [1] - context tag No.1 (it is assumed that it is the sequence),
  [3] - it is the context tag No. 3 in this sequence (again, it must be a sequence),
  2 - it is the second tag in order in this sequence (again, it must be a sequence),
  1 - it is the first tag in order in this sequence.
  The address in 'tree' starts from the propertyValue level (see the examples below). The easiest way to view the parsed message is to turn on debugging for a line and watch the debug info on the console or in the line log file.
  
  Example 1: Let's have a device that contains the object of type 2 (Analog Value) with instance number 1. Let's assume that the device sends the object value as a triplet of numbers. The first number is the current value, the second one is a one-minute average and the third one is a ten-minute average. The log of the parsed message could be the following:

   === ASN Body beg ===
   objectIdentifier (tag 0) OBJID 2 analog-value,1
   listOfResults (tag 1) SEQUENCE {
    propertyIdentifier (tag 2) ENUM 85 present-value
    propertyValue (tag 4) SEQUENCE {
     REAL 1.40000E+00
     REAL 1.10000E+00
     REAL 1.30000E+00
    }
   }
   === ASN Body end ===
  

  If you want all three values, you must configure three I/O tags (Object type=analog_value, Instance=1, Property-identifier=present-value, Property-type=complex), which differ in the complex address (for the first I/O tag specify 1, for the second one specify 2, and for the third one specify 3). Tick off the checkbox Subscribe/read in a configuration of one of these I/O tags only, because the response to one request is the message with three values. When sending the ReadProperty-Request, ReadPropertyMultiple-Request, SubscribeCOV-Request, SubscribeCOVProperty-Request, and WriteProperty-Request messages, the complex address is not used.
  
  Note: If you configure the I/O tag with Property-type=simple, its value would be set to the first found value after parsing of the message (in the previous example it is 1.40000E+00).
  
  Example 2: Siemens Desigo PXC64-U contains I/O tag (Object type=schedule, Instance=6, Subscribe-read is checked, Property-identifier=weekly-schedule, Property-type=complex, Array index=1, Complex address=1). A debugging has been started on the line. After the I/O tag is saved, the KOM process sends the request and writes the response:

   === ASN Body beg ===
   objectIdentifier (tag 0) OBJID 17 schedule,6
   propertyIdentifier (tag 1) ENUM 123 weekly-schedule
   propertyArrayIndex (tag 2) UNSIGNED 1
   propertyValue (tag 3) SEQUENCE {
    SEQUENCE {
     TIME 0:0:0.0
     UNSIGNED 2
     TIME 4:0:0.0
     UNSIGNED 3
     TIME 22:0:0.0
     UNSIGNED 1
    }
   }
   === ASN Body end ===
  

  In propertyValue, there is the sequence of 6 values (time and positive number alternately). If you want to access the first time, you have to set Complex address=1.1, if to the first positive number, set Complex address=1.2. I.e. the first element - sequence - the second element in the order within it (UNSIGNED 2). If you need to access to more times and/or values at the same time, you must configure several I/O tags and check the Subscribe/read checkbox in one of them only.
  
  Note 1: If the I/O tag was created with a complex address 1, its value would remain Unknown, because this address matches the 1st element in propertyValue, which is a sequence, not a simple type.
  
  

  Kotva
  pozn2 pozn2

  Note 2: The I/O tag of Text type is able to contain not only simple value but also any ASN sequence. The values are written according to rules for writing of ASN sequence. If you set Complex address=1 and change the I/O tag to text input or text output in the previous example, its value will be a string " T0:0:0.0; u2; T4:0:0.0; u3; T22:0:0.0; u1; ". If Property-type=complex, but Complex address is not defined, the value will be "0{ T0:0:0.0; u2; T4:0:0.0; u3; T22:0:0.0; u1; }".
• Increment: increment of value change in the object property which causes the reporting of a change (see SubscribeCOVProperty).
• Confirmed: the checkbox specifies whether the device should send the confirmed notifications (ConfirmedCOVNotification-Request) or unconfirmed one (UnconfirmedCOVNotification-Request) for the configured Request types SubscribeCOV and SubscribeCOVProperty.

• Kotva
  subscriberead subscriberead

  Subscribe/read: if the checkbox is ticked, the respective messages for reading/registration of value changes are sent for the configured Request types:
  ReadProperty: the ReadProperty-Request message
  ReadPropertyMultiple: the ReadPropertyMultiple-Request message
  SubscribeCOV: the SubscribeCOV-Request message 
  SubscribeCOVProperty: the SubscribeCOVProperty-Request message 
  ReadWriteScheduler: the ReadProperty-Request message

...

Note: In versions from 20th December 2018 and newer, the recycling of browser dialog has been implemented. If the dialog is closed by the Cancel button or after selecting an object, it is actually only hidden and it is available for browsing by another I/O tag within the same station so that the tree structure with , containing the browsed objects, is preserved. Clicking on the close icon at the top right corner will cause the dialog to be really closed.

...

Note: If the Application tag is not configured properly (for the binary value it is Enum), the Desigo station returns an error 'invalid-data-type' when attempting to write:

...

When writing the value, the WriteProperty-Request message is used. As Subscribe/read is checked, the value is read after it's written. If I/O tag would be configured with Request type WriteProperty, its behavior would differ only by an absence of periodic value reading (when starting the KOM process and during its running, the period is configured on the station, in Time parameters tab).

...

D2000 supports the reading and writing of schedulers. A scheduler contains BACnet attributes weekly-schedule(123) and exception-schedule(38).
Weekly-schedule is the field an array of 7 items (one item for each day in of the week). Each item represents a sequence of time-value pairs that defines define the value changes of the scheduler in a given time. When reading and writing, you can configure also an Array index which enables to access to the items in an array and access individual items of a weekly-schedule(123) array. The array index is 1-7 for single individual days (1=Monday), the index 0 contains a size of the array (value 7 for the attribute the weekly-schedule(123) )attribute, value 0 up to N for the exception-schedule(38) attribute).
Exception-schedule is intended for the holidays that require a different regime mode as is configured for common days. Exception-schedule is the sequence of 0 up to N items. One An item always contains a date (or range of dates), several time-value pairs (as regards in a weekly-schedule), and a priority (1= top, 16= the lowest). The priority defines which of the items will be used if they overlap.

Reading of scheduler (the

...

weekly-schedule attribute)

• Value after -by-value: a dynamic change of complex address (1.1, 1.2, 1.3, etc.) in a script enables us to read all values and times similarly as for other properties.
• All times and values for one day at the same time:
  • Value type: a text input (reading of scheduler) or text output (read/write)
  • Request type: ReadProperty (reading of scheduler), ReadWriteScheduler (read/write)
  • Subscribe/read: Y
  • Object type: schedule(17)
  • Instance: an instance number (e.g. 6) which is found in a Desigo configuration or with the help of the WhoIs request.
  • Property type: Complex
  • Property identifier: weekly-schedule(123)
  • Array index: 1 up to 7, it depends on the day being read
  • Application tag: if it is not defined, Unsigned is will be used (it is necessary used only when for writing the value)
  • Complex address: 1 (address of a sequence)

The times and values separated by a semicolon are read into the text value (see Note).
When writing the value to a scheduler you should realize that the value can be sent with various application tags (Unsigned, Signed), however, the device expects a particular tag (the easiest way to find it, is by reading of the value  value while line logging is active on the line). The application tag of value is defined by the item Application tag item in the configuration. The valid value of Application tag can be Boolean, Unsigned, Signed, Real, and Double. If any other type is set, the Unsigned value is automatically sent. A value type can be changed dynamically - if the first character of a text value is B, U, S, R or D, it stands for (B)oolean, (U)nsigned, (S)igned, (R)eal or (D)ouble.

...

Writing to the scheduler (the weekly-schedule attribute)

• You must configure Request type=ReadWriteScheduler and assign

...

• a sequence of time-value pairs separated by semicolon into I/O tag of text output

...

• type, e.g. "0:0:0; 1; 2:30:40.5; 2; 5:00:00;1".
• The text string with the length=0 is ignored so that the "empty sequence" will not be

...

• written to the scheduler after saving the D2000 configuration or

...

• when the KOM process is started. For this reason, if the time plan of the scheduler must be deleted for

...

• a particular day, the string of nonzero length (it contains neither time nor value: " ") must be

...

• written to the I/O tag.

Kotva
note_schedulersiemens note_schedulersiemens

Note: Another possibility to write weekly-schedule, besides the special ReadWriteScheduler request ReadWriteScheduler, to write weekly-schedule is recording writing of an ASN sequence, e.g. the sequence "{ T0:0:0 u1; T2:30:40.5 u2; T5:0:0 u1 }" corresponds to the value "0:0:0; 1; 2:30:40.5; 2; 5:00:00;1". The I/O tag configuration differs only in Request type=ReadProperty. You can also write the time frame schedule for the whole week, if Array index is not set and the value contains 7 sequences for the individual days, e.g. "{ T0:10:0 u3 T1:3:0 u1; } {T2:0:0.0 u2 T5:30:10.0; u3; } { T6:0:0.0 u2 T7:0:0.0 u3} { T20:0:0.33; u1} { T21:0:0.0; u1} { T22:0:0.0; u2} { T0:0:0.0; u3; T1:2:0.0; u1; T2:0:0.0; u2; T5:30:10.0; u3}".

...

Writing to the scheduler (the exception-schedule attribute)

The recording of writing to the exception-schedule is supported over via the recording writing of the an ASN sequence.
Example: I/O tag configuration:

...

Application tag: not defined (write the whole ASN sequence)

With Using the help of this string "0{ 0D2.10.2005 } 2{ T1:0:0; u1; T12:0:0; u3 } 3u10" you can write the time frame schedule for the day October 2, 2005. The scheduler has the value 1 from since 1:0:0, the value 3 from since 12:00:00. The priority of the exception-schedule is 10. When rereading of reading a value after writing (Subscribe/Read was configured) with the activated debug on the line, you can see the following log:

...

To set the exception-schedule for the range of dates, write the value "0{ 1{ D5.10.2005; D8.10.2005}} 2{ T1:0:0; u1; T7:0:0; u3; } 3u15". This value for the range of dates 5.10.2005-8.10.2005 sets the scheduler from 1:00:00 to the value 1 and from 7:00:00 to the value 3. The priority of the exception-schedule is 15. When rereading of value  When reading a value after writing (Subscribe/Read was configured) with the activated debug on the line, you can see the following log:

...

Several items of above mentioned types can be written to the  the exception-schedule by the using a string which contains jointed joined sequences, e.g. "0{ 0D2.10.2005 } 2{ T1:0:0; u1; T12:0:0; u3 } 3u10 0{ 0D3.10.2005 } 2{ T0:0:0; u2; T5:0:0; u3; T14:0:0; u1 } 3u11 0{ 1{ D5.10.2005; D8.10.2005}} 2{ T1:0:0; u1; T7:0:0; u3; } 3u15 "

...

We also tested the reading and writing to the scheduler in the Delta Controls DAC-1146 device. Only the BACnet attribute weekly-schedule(123) was tested. The weekly-schedule is an array with 7 items (one item for each day in the week). Each item is the sequence of time-value pairs that define the value changes of the scheduler in given at a specific time. In contrast of to Siemens Desigo devices, the schedulers are implemented with Boolean values True/False that are externally presented as Enum values 0/1. This is the example of scheduler Delta Controls:
"{ T0:10:0 E0 T1:3:0 E1; } {T2:0:0.0 E1 T5:30:10.0; E0; } { T6:0:0.0 E0 T7:0:0.0 E1} { T20:0:0.33; E0} { T21:0:0.0; E1} { T22:0:0.0; E0} 0{ T0:0:0.0; E0; T1:2:0.0; E1; }"
The writing has done and then as well as subsequent reading of E2 value E2can be performed, however the interpretation by , we don't know the DAC-1146 is unclear.'s interpretation of E2 :-) .

Kotva
events events

Information about events

...

The request GetEventInformation-Request is intended to call for ask the list of objects that are in the state Offnormal or Fault states or whose change to Offnormal, Fault, or Normal has not been acknowledged from the device.
Example of I/O tag configuration:

• I/O tag type: text input (TxtI)
• Request type: GetEventInformation
• Subscribe/read: Y
• Object type: undefined
• Instance: undefined
• Property type: complex
• Application tag: undefined

The message GetEventInformation-Ack is a A reply to GetEventInformation-Request is the GetEventInformation-Ack message, which contains the list of objects and the list of properties for each object:

• objectIdentifier: identifier of object
• event-state: object status (0=normal, 1=fault, 2=offnormal, 3=high-limit, 4=low-limit, 5=life-safety-alarm)
• acknowledgedTransitions: 3 bits that define whether the last transition to the offnormal, fault, or normal status was acknowledged
• eventTimeStamps: the

...

• timestamps of the last transition to the offnormal, fault, and normal status
• notifyType: defines whether it is a notification of alarm (0) or event (1)
• eventEnable: 3 bits that

...

• define whether the events report to to-offnormal, to-fault, to-normal
• eventPriorities: 3 unsigned values defining the event

...

• priorities

At the end of the list, there is the moreEvents attribute moreEvents that is non zero if the list of events is incomplete (e.g. the exceeding of the maximum length of maximum the message, etc.). For In this reasoncase, you must reconfigure the I/O tag and set Object type and Instance on to the last object in the list. It causes the generation of a new message GetEventInformation-Ack message.

Example of response GetEventInformation-Ack response:

 === ASN Body beg ===
 listOfEventSummaries (tag 0) SEQUENCE 0 {
  objectIdentifier (tag 0) OBJID 0 analog-input,1
  event-state (tag 1) ENUM 3 high-limit
  acknowledgedTransitions (tag 2) BITSTRING 1,1,1 to-offnormal(0),to-fault(1),to-normal(2)
  eventTimeStamps (tag 3) SEQUENCE 3 {
   dateTime (tag 2) SEQUENCE 2 {
    date DATE 9.11.2005 Wed
    time TIME 13:28:49.0
   }
   dateTime (tag 2) SEQUENCE 2 {
    date DATE 9.11.2005 Wed
    time TIME 13:25:59.0
   }
   dateTime (tag 2) SEQUENCE 2 {
    date DATE 9.11.2005 Wed
    time TIME 13:25:56.0
   }
  }
  notifyType (tag 4) ENUM 0 alarm
  eventEnable (tag 5) BITSTRING 1,1,1 to-offnormal(0),to-fault(1),to-normal(2)
  eventPriorities (tag 6) SEQUENCE 6 {
   eventPriority UNSIGNED 3
   eventPriority UNSIGNED 3
   eventPriority UNSIGNED 7
  }
  objectIdentifier (tag 0) OBJID 214,1
  event-state (tag 1) ENUM 2 offnormal
  acknowledgedTransitions (tag 2) BITSTRING 0,1,0 to-offnormal(0),to-fault(1),to-normal(2)
  eventTimeStamps (tag 3) SEQUENCE 3 {
   dateTime (tag 2) SEQUENCE 2 {
    date DATE 18.11.2005 Fri
    time TIME 12:52:11.0
   }
   dateTime (tag 2) SEQUENCE 2 {
    date DATE 18.11.2005 Fri
    time TIME 11:16:23.0
   }
   dateTime (tag 2) SEQUENCE 2 {
    date DATE 9.11.2005 Wed
    time TIME 12:23:58.0
   }
  }
  notifyType (tag 4) ENUM 0 alarm
  eventEnable (tag 5) BITSTRING 0,0,0 to-offnormal(0),to-fault(1),to-normal(2)
  eventPriorities (tag 6) SEQUENCE 6 {
   eventPriority UNSIGNED 3
   eventPriority UNSIGNED 3
   eventPriority UNSIGNED 7
  }
 }
 moreEvents (tag 1) BOOLEAN FALSE
 === ASN Body end ===    

...

You can acknowledge the events and alarms, whose list has been loaded received by the request GetEventInformation request. According to the BACnet protocol, the format of this request is (the record in ASN.1 syntax):

  *********************** Confirmed Alarm and Event Services ******************
  AcknowledgeAlarm-Request ::= SEQUENCE {
    acknowledgingProcessIdentifier [0] Unsigned32,
    eventObjectIdentifier [1] BACnetObjectIdentifier,
    eventStateAcknowledged [2] BACnetEventState,
    timeStamp [3] BACnetTimeStamp,
    acknowledgmentSource [4] CharacterString,
    timeOfAcknowledgment [5] BACnetTimeStamp
  }

The For a more detailed description of the parameters is stated in , see the literature.
The acknowledgment is executed by the writing of the above-mentioned sequence to the text of the output I/O tag according to the record rules of writing of any ASN sequence.

Example: The loading of following list of alarms and events with the help of GetEventInformationwas read using the GetEventInformation request:

   ===  ASN Body beg ===
   listOfEventSummaries (tag 0) SEQUENCE 0 {
    objectIdentifier (tag 0) OBJID 0 analog-input,1
    event-state (tag 1) ENUM 4 low-limit
    acknowledgedTransitions (tag 2) BITSTRING 0,1,1 to-offnormal(0),to-fault(1),to-normal(2)
    eventTimeStamps (tag 3) SEQUENCE 3 {
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 11:54:23.0
     }
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 10:4:37.0
     }
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 11:54:23.0
     }
    }
    notifyType (tag 4) ENUM 0 alarm
    eventEnable (tag 5) BITSTRING 1,1,1 to-offnormal(0),to-fault(1),to-normal(2)
    eventPriorities (tag 6) SEQUENCE 6 {
     eventPriority UNSIGNED 3
     eventPriority UNSIGNED 3
     eventPriority UNSIGNED 7
    }
    objectIdentifier (tag 0) OBJID 0 analog-input,2
    event-state (tag 1) ENUM 3 high-limit
    acknowledgedTransitions (tag 2) BITSTRING 1,1,1 to-offnormal(0),to-fault(1),to-normal(2)
    eventTimeStamps (tag 3) SEQUENCE 3 {
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 10:41:59.0
     }
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 10:12:20.0
     }
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 10:12:21.0
     }
    }
    notifyType (tag 4) ENUM 0 alarm
    eventEnable (tag 5) BITSTRING 1,1,1 to-offnormal(0),to-fault(1),to-normal(2)
    eventPriorities (tag 6) SEQUENCE 6 {
     eventPriority UNSIGNED 3
     eventPriority UNSIGNED 3
     eventPriority UNSIGNED 7
    }
    objectIdentifier (tag 0) OBJID 214,1
    event-state (tag 1) ENUM 2 offnormal
    acknowledgedTransitions (tag 2) BITSTRING 0,1,1 to-offnormal(0),to-fault(1),to-normal(2)
    eventTimeStamps (tag 3) SEQUENCE 3 {
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 11:54:23.0
     }
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 10:12:20.0
     }
     dateTime (tag 2) SEQUENCE 2 {
      date DATE 25.11.2005 Fri
      time TIME 10:12:21.0
     }
    }
    notifyType (tag 4) ENUM 0 alarm
    eventEnable (tag 5) BITSTRING 0,0,0 to-offnormal(0),to-fault(1),to-normal(2)
    eventPriorities (tag 6) SEQUENCE 6 {
     eventPriority UNSIGNED 3
     eventPriority UNSIGNED 3
     eventPriority UNSIGNED 7
    }
   }
   moreEvents (tag 1) BOOLEAN FALSE   === ASN Body end === 

The first object is the first in list
objectIdentifier (tag 0) OBJID 0 analog-input,1
which is in has the status low-limit status 
event-state (tag 1) ENUM 4 low-limit
and contains has unacknowledged transition to the offnormal status (i.e. according to D2000 terminology it is an active alarm low-limit alarm which requires the acknowledgement):
acknowledgedTransitions (tag 2) BITSTRING 0,1,1 to-offnormal(0),to-fault(1),to-normal(2)
This transition occurred in time
dateTime (tag 2) SEQUENCE 2 {
date DATE 25.11.2005 Friri
time TIME 11:54:23.0
}
The alarm is acknowledged with the record of by writing a text value
0u1; 1o0:1 ; 2E2; 3{ 2{ D25.11.2005 T11:54:23} } 4C'D2000' 5{ 2{ D25.11.2005 T11:55:23 }}
and the individual items are as follows (see the definition of AcknowledgeAlarm-Request above):

• 0u1u1 - tag 0, unsigned value 1 - acknowledgingProcessIdentifier = identifier of process which acknowledges the alarm (it could can be optionalarbitrary)
• 1o0:1:1 - tag 1, the identifier of object of type 0, instance 1 - eventObjectIdentifier = the identifier of object which contains the alarm
• 2E2 - tag 2, enum value 2 - eventStateAcknowledged = the acknowledged value (BACnet standard defines the following events that can be acknowledged):
  normal (0),
  fault (1),
  offnormal (2),
  high-limit (3),
  low-limit (4),
  life-safety-alarm (5)
  in this case we acknowledge the transition to the offnormal status in this case status 
• 3{ 2{ D25.11.2005 T11:54:23} } - timeStamp = the sequence with of date and time which must be acknowledged (it must match to the received event date and time which has been read)
• 4C'D2000' - acknowledgmentSource = a source of alarm acknowledgement (it seems any string is okit's an arbitrary string)
• 5{ 2{ D25.11.2005 T11:55:23 }} - timeOfAcknowledgment = date and time when the alarm was acknowledged

After acknowledging of alarm and a repeated reading of the list of alarms and events by the request GetEventInformation request , you will see the alarm has been acknowledged, as 
acknowledgedTransitions (tag 2) BITSTRING 0,1,1 to-offnormal(0),to-fault(1),to-normal(2)
will change to:
acknowledgedTransitions (tag 2) BITSTRING 1,1,1 to-offnormal(0),to-fault(1),to-normal(2)

If the object had been in a normal state, it would not have been listed in the list of alarms at all. In this example it is in low-limit state, i.e. it is an active acknowledged alarm.

To read the list of alarms, to show them in a browser, and to acknowledge the alarm, you must write the ESL scripts which will parse the text value of GetEventInformation request and compose a text value for AcknowledgeAlarm.

...

If the station has at least one I/O tag with Address Type = Name, the numerical address is detected by Who-Has-Request from ObjectName when initializing these I/O tags. After getting the address, the data (the quadruplet ObjectName; Object Type; Instance; DeviceInstance) is saved to the cache file and is available for the next start of the KOM process.
There is one cache file for every station. It is located in an application directory, in a subdirectory Cache. Its name is Cache_station_name.txt, e.g. Cache_B.StationX1.txt.
When saving a BACnet station, the data is reloaded from this file. If the file was not found, the Who-Has messages are generated for all I/O tags that contain Address Type = Name in this station.
This behavior may be used after changing the configuration of the device which communicates with the KOM process (if the addresses of objects were changed when changing the configuration). Just delete the cache file in this station and save it the station - within several seconds, the cache file will be created again and it will be filled with the acquired data.

Note: the interaction of cache and I/O tags with Request type = WhoHas.

• If the parameter Subscribe/read is

...

• checked in the configuration of the I/O tag, the cache is not searched and the Who-Has-

...

• Request message is sent to the communication. The obtained information is not written to the cache. It can be used for the objects that are generated and deleted dynamically, which would otherwise

...

• congest the cache.
• If Subscribe/read is

...

• not checked in the configuration of the I/O tag, the cache is searched. If ObjectName or ObjectIdentifier was not found, the Who-Has-Request message is sent to the communication. If the

...

• response comes, the information is written into the cache.

Kotva
delta delta

Comment on Delta Controls devices

...

The test configuration included a DSC-1212E device connected to the local Ethernet network Ethernet and a DAC-633 device connected to DSC-1212E over MS/TP interface (RS-485). D2000 KOM communicated directly with DSC-1212E, and with a DAC-633 over DSC-1212E (it which performed the function of a BACnet router).
We used the software ORCAview 3.30 Build 1481 software from which we detected obtained the following configuration information:

Kotva
dsc-1212e dsc-1212e

DSC-1212E
After logging on to the ORCAview and finding a DSC-1212E device, the object BACnet Settings 3200 (3200 is a software address of the particular device) can be found in the right pane of the Navigator dialog window window. Clicking on BACnet Settings 3200 opened the a dialog window which that contained several tabs. The first tab (Setup tab included ) contained also the UDP/IP port type. After clickin clicking it, its parameters are displayed in at the bottom of the window, e.g. among others Network (during the testing, we saw a specific number 40032), IP Address, and UDP Port.
When communicating with DSC-1212E, in the D2000 configuration of the station the Source network could be either set to the value of Network or left empty. The IP Address and UDP Port parameters must be used to configure the Address and Port parameters in the station configuration in D2000. A station type was BACnet/IP.

Note: On thethe Advanced tab, in the BACnet Properties area, the parameter Local Netwok Number was set to 10032 (it was the same as the Network port of the Ethernet type on the Setup tab). This port is used for BACnet over Ethernet communication (without the use of IP protocol), which is not supported in by D2000 yet.

Kotva
dac-633 dac-633

DAC-633
I logged After logging on to the ORCAview and found finding a DAC-633 device. Then , the object BACnet Settings 3202 (3202 is a software address of the particular device) occurred can be found in the right panel in Navigator dialog windowpane of the Navigator window. Clicking on BACnet Settings 3202 opened the a dialog window which contained several tabs. The tab (Setup tab included ) contained also the port MS/TP port with the Status attribute Status, the and its value Active, and the and the attribute Status Reference of with a value BACnet Settings 3202 (NET1). After I had clicked on clicking it, its parameters displayed in at the bottom of the window, e.g.  among others Network and MAC Address.
When communicating with DAC-633 I had to set , the following station parameters had to be configured in D2000:

• Station type: BACnet/IP
• Address: the parameter IP Address in the configuration of DSC-1212E
• Port: the parameter UDP Port

...

• in the configuration of DSC-1212E
• Source network: the parameter Network in the configuration of DSC-1212E
• Destination network: the parameter Network

...

•  of the MS/TP port in the configuration of DAC-633
• Destination address: the parameter MAC Address

...

• of the MS/TP port in the configuration of DAC-633

As D2000 communicates with DAC-633 over via DSC-1212E, the parameters Address, Port, and Source network, which correspond to DSC-1212E, and Destination network and Destination address, which correspond to MS/TP network between DSC-1212E and DAC-633, must be set in the station configuration.

Both devices support the both polling and change method of reading of data (both ReadProperty and SubscribeCOV).
The parameters Object type and Instance parameters in the configuration of the I/O tag was were detected in ORCAview from the attributes Object and Description attributes (e.g. object 3200.AI12 is Analog Input, Instance 12; the object 3202.PG3 is Program, Instance 3). The parameter Address type parameter is Object type+Instance and Request type is SubscribeCOV, if it is not defined other parameter.
unless declared otherwise:

Communicated I/O tagstag types:

• Analog-input
• Analog-output (Application tag: Real -

...

• can be written)
• Analog-value (Application tag: Real -

...

• can be written)
• Binary-input
• Binary-output (Application tag: Enum -

...

• can be written)
• Binary-value (Application tag: Enum -

...

• can be written)
• Calendar (Request type: ReadProperty, Property type: Complex, Property identifier: datelist(123), Application tag: Date, Complex address: 1,2,.. etc. -

...

• sequential reading

...

• of the array; possibility to write the whole calendar

...

• using the

...

• ASN sequence

...

• when the Complex address is not

...

• specified, e.g. "0D1.9.2006; 0D3.10.2006; 0D8.9.2006")
• Event-enrollment
• Schedule (Request type: ReadProperty or WriteProperty -

...

• can be written; Property identifier: weekly-schedule(123))
• Program (Request type: ReadProperty, Application tag: Boolean -

...

•  can be written - stops and starts the program)
• Multi-state-value (Application tag: Unsigned -

...

• can be written)
• Trend-log (the cyclic buffer of values that are saved with the configured

...

• period)
  • Property identifier: 1074 - an array of trend

...

• • timestamps in tens of milliseconds since

...

• • the time of data reset
  • Property identifier: 1076 - bit string array (attributes of values?)
  • Property identifier: 1077 - an array of trend values
  • Property identifier: 1105 - the time of

...

• • data reset

Kotva
e-ddc3.1 e-ddc3.1

Comment on E-DDC3.1 devices

...

The communication was revived according to worked with the following configurationsettings:

• Line: TCP/IP-UDP
• Station type: BACnet/IP
• Address: 10.0.6.23 (IP address of E-DDC3.1)
• Port: 47808
• Source network: not

...

• specified
• Destination network:

...

• not specified
• Destination address: 2001 (this was acquired from manufacturer's BACnet OPC server - the

...

• "Device ID" parameter)

We tested ReadProperty, SubscribeCOV, WriteProperty (in with the objects of Binary Output, Binary Value, Analog Value type).
The defined Communicated I/O tags tag types (the test configuration contained only these types):

• Analog-input
• Analog-value (Application tag: Real -

...

• can be written)
• Binary-input
• Binary-output (Application tag: Enum -

...

• can be written)
• Binary-value (Application tag: Enum -

...

• can be written)

The device with the original firmware (2.01.05) with the original firmware did not work with properly handle Who-Is request. We had to upgrade this firmware to the version 2.01.16. Then everything, including WriteProperty, worked properly.

Kotva
desigo desigo

Comment on Siemens Desigo devices

...

Based on the document "DESIGO INSIGHT: Installation, setup and communication - Engineering guide", the recommended address settings for LonWorks communication are:

• DomainID: 0x49
• SubnetID: 1
• NodeID:
  • 1..100 - range reserved for automation stations (PX) and system devices (BACnet routers)
  • 101..120 - operating devices and DESIGO INSIGHT management stations
  • 121..127 - temporary

...

• • operator devices (e.g. the PXM20 operator unit) and tools (DTS)

Kotva
mbg-mstp mbg-mstp

Comment on Klimasoft MBG-MSTP devices

...

The test configuration contained Moxa NPort 5150 (a converter from UDP to RS485) connected to the converter MBG-MSTP converter, which communicated with a heat meter Siemens UH50-A21R-SK06-G. Only analogue inputs was detected. The converter The analog inputs were read, the MBG-MSTP converter supported ReadProperty only ReadProperty.
The communication was revived according to worked with the following configurationsettings:

• Line: SerialOverUDP Device Redundant with the IP address and port of the Moxa NPort 5150
• The

...

• parameters of BACnet protocol

...

• which are configured on the line:
  MS/TP address: 6 (any address 1-254 that does not clash with other addresses on RS485 bus)
  MS/TP N max_info_frames: 20.

...

• The default value is 5. If this parameter exceeds the number of I/O tags, it causes

...

• all I/O tags

...

• to be read in one cycle

...

• , which is not interrupted because of sending a token. We recommend

...

• not to increase the value of this parameter if other master devices are connected with RS485

...

• , which could have problems if they do not receive

...

• a token for a longer time.
  MS/TP usage_timeout: 99. According to a standard, the value must be under 100 ms.

...

• The default value of 20 ms caused

...

• problems with communication (MBG-MSTP did not manage to react

...

• within a specified timeout).

...

• Station type: MS-TP
• Address: 1 (according to the configuration of MBG-MSTP)
• I/O tag configuration:
  Request type: ReadProperty
  Object type: analog-input(0)
  Instance: according to the configuration of MBG-MSTP or a device which is behind it

Kotva
ilon10 ilon10

Comment on iLON 10 Ethernet adapter

...

When using the iLON 10 Ethernet adapter for communication you should realize that the communication processor of this device (Neuron 3120) has relatively short default buffers (network buffer is 66 bytes). Therefore it does not receive the longer packets. It can be seen in the web interface of iLON 10 - on the Status tab Status and , the parameter Missed Messages increases number increases when trying to read the value (e.g. always after saving the I/O tag if its parameter Subscribe/read is marked). This problem occurred during testing when schedule a time plan of a scheduler contained more than 4 pairs 4 time-valuevalue pairs. When there were 4 pairs, the length of the LON message was 63 bytes. After adding next another pair via PXM20, the loading reading of schedule the scheduler failed.

Warning! The NodeUtil utility NodeUtil enables to increase the size of the received packet by increasing of both the network and application bufferbuffers. However, if you set improper values, you can damage the iLON 10 device (Neuron 3120 stopped communication with the user processor).
If you decide to preset reconfigure the size of buffers, just change it from 66 bytes to 88 (and reduce the number of buffers) because the KOM process informs, in its packets, that it is able to receive 50-byte ASDU (+ 3 bytes BACnet header 3 and 16 bytes and LON header 16 bytes).
The buffers of the PCLTA-10 ISA adapter (built on the Neuron 3150 communication chip Neuron 3150) had the long enough buffers (255 bytes).
After we bought the a new iLON 10, the configuration was successful with these parameters:

• configuration software: Echelon Node Utility Release 1.82

...

• sizes and

...

• quantities of buffers:

    DEVICE:0> (B)uffer configuration
    Node buffer configuration
    Type			Count	Size	Bytes
    Receive transaction	11	13	143
    Transmit transaction	2	28	56
    App buffer in		2	82	164
    App buffer out		2	82	164
    Net buffer in		5	82	410
    Net buffer out		2	82	164
    App buff out priority	1	82	82
    Net buff out priority	1	82	82
    ==> Total bytes = 1265
    

...

The implementation of BACnet MS/TP is not complete yet. It was tested only on basic in an elementary configuration (the D2000 KOM against a BACnet MS/TP MicroGateway produced by the York company). The communication works with both the Serial line (RS485/RS232 converter was used) and SerialOverUDP Device Redundant line (Moxa NPort series 5xxx was used).
MicroGateway (York company) implements the communication of an MS/TP Master type (i.e. it sends the frame the Poll for master frame to detect the existence of other Master stations). The D2000 KOM relies on a partner station and does not contain the implement a method of sending of this frame type. Also, it does not solve handle a failure of the station to which it sends a token.
The actual present implementation is applicable only for communication with one Master station. It can be applicable used for communication with one or more Slave stations (not tested). Also, the time ratio could cause some problems in heavily loaded systems, i.e. KOM could answer to the frames the Poll for master or Token frames later than in required time, which may might cause the collisions on the line. The time ratios may become even worse when you activate the logs on the line.

Kotva

...

bbmd bbmd

Comment on BBMD (BACnet Broadcast Management Devices) support

The following feature concerning the conversion of text names to numeric addresses of measured points (Siemens Desigo devices) on the TCP/IP-UDP line has been added to the BACnet protocol (and is available in versions published after 17.01.2012): if the KOM process sends a Who-Has request and the I-Have response comes from another IP address, the KOM process searches for the station that sent the Who-Has request with the text name specified in the response (within the line). If such a station is found, the answer is matched to its challenge.
This feature is useful when communicating with multiple Siemens routers (behind which are, for example, BACnet/LON devices), one of which is configured as a BBMD (Bacnet Broadcast Management Device) and the other is not.
Model situation:
The KOM process communicates with two Desigo PXG80-N BACnet routers (Rtr1 and Rtr2). Behind each router is a LON network, for simplicity with a single Desigo PXM20 station (Des1 or Des2). Router Rtr2 is configured to forward BACnet broadcasts from the LON network to Rtr1.

• Rtr1 has an IP address of 10.0.0.1 and has BBMD functionality enabled. Behind Rtr1 is the LON network with network address 11 and a Desigo PXM20 device (Des1) with address 1.1
• Rtr2 has an IP address of 10.0.0.2 and has BBMD functionality turned off. Behind Rtr2 is the LON network with network address 12 and a Desigo PXM20 device (Des2) with address 2.2

Let's have one TCP/IP-UDP communication line and on it two BACnet/IP stations representing Des1 and Des2

• L.Bacnet line:  TCP/IP-UDP type
• Station B.Des1:
  Station type: BACnet/IP
  Address: 10.0.0.1 (address of Rtr1, behind which Des1 is located)
  Port: 47808 (standard BACnet port)
  Destination network: 11 (address of network behind Rtr1)
  Destination address: 1.1 (address of Des1 in a LON network)
  Register-Foreign-Device: enabled (for the KOM process to register as a broadcast recipient on Rtr1, which has active BBMD functionality)
• Station B.Des2:
  Station type: BACnet/IP
  Address: 10.0.0.2 (address of Rtr2, behind which Des2 is located)
  Port: 47808 (standard BACnet port)
  Destination network: 12 (address of network behind Rtr2)
  Destination address: 2.2 (address of Des2 in a LON network)
  Register-Foreign-Device: disabled (Rtr2 has inactive BBMD functionality)
• Any I/O tag M.Des2_test on B.Des2 station (e.g. of SubscribeCOV type) with Address type = Name

The KOM process sends a Who-Has request to the Des2 device to convert the text name configured in the M.Des2_test address. The IP address of Rtr2 (10.0.0.2) is used for sending.
Rtr2 forwards the request to the LON network to Des2 (according to the parameters Destination network = 12 and Destination address = 2.2 specified in the configuration of B.Des2 station ). An I-Have broadcast response arrives from the BACnet/LON device Des2. As the BACnet router Rtr2 is without BBMD support, it forwards the response (assuming it is configured to do so) to the BACnet router Rtr1, which has BBMD support enabled.
Rtr1 forwards the I-Have message as a UDP packet to the KOM process because the Register-Foreign-Device parameter of B.Des1 station is configured and thus the KOM process has registered as a broadcast message recipient at Rtr1. This way, the I-Have message gets to the KOM process with a different IP address than the original request. The functionality described above matches such a response with a request from the B.Des2 station based on the match of the text name of the object in the sent request.

At the same time, one configuration limitation results from the described procedure - all the described activities take place in the context of one line, so it is necessary that all stations that are within the scope of one BBMD device are located on one line.

Kotva
tell_cmd tell_cmd

Tell commands

...

Kotva
literatura literatura

Literature

...

Info
title Blogs
You can read blogs about BACnet protocol (for now, in Slovak language only): Communication - BACnet protocol  Communication - BACnet protocol, part 2 Communication - BACnet protocol, part 3

Kotva
zmeny_upravy zmeny_upravy

Changes and modifications

...

Ver. 1.1 - October 20, 2005 - support of schedulers, reading, and writing of ASN sequences

Ver. 1.2 - November 22, 2005 - support of a dynamic detection of I/O tag address from the object name, address cache in a file

Ver. 1.3 - June 14, 2006 - support of BACnet router (tested with PXG80-N)

Ver. 1.4 - April , 02, 2008 - a partial support of BACnet MS/TP protocol (tested on BACnet MS/TP MICROGATEWAY on the cooler produced by York company)

...