ELGAS-2 (CP II) communication protocol
Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions
Supported device types and versions
The protocol supports the communication with ELCOR-2 and microELCOR-2 devices (made by the ELGAS company ) that recalculate a gas quantity.
Communication line configuration
- Communication line category: Serial, SerialOverUDP Device Redundant.
The asynchronous transmission parameters are set according to the setting of a specific device.
Communication station configuration
- Communication protocol: Elcor ELGAS-2 (CP II).
- Station address:
- Node address: value in the range of 0 to 65535.
- Address: meter address, a value in the range of 0 to 255.
- If both addresses are 0, the device must answer obligatorily.
Password for reading: maximum of 6 characters is allowed if the password is set in the device (ELCOR-2 only).
Station protocol parameters
Configuration dialog box - tab „Parameters".
They influence some optional parameters of the protocol. Following station protocol parameters can be set:
Table 1
| Full name | Meaning | Unit | Default value |
|---|---|---|---|
Device Type | Selection of device type. | ELCOR-2 or microELCOR-2 | ELCOR-2 |
Retry Count | The delay between request retries in case of a communication failure. | 3 | |
Wait First Timeout | Delay after sending the request before reading the response. | ms | 100 ms |
Wait Timeout | Delay between response readings until it is completed. | ms | 100 ms |
Max. Wait Retry | Retry count of response reading until it is completed. | 30 | |
Static Data Read Period | Static - configuration data read period (microELCOR-2 only). | min | 60 min |
Hourly Archive Periodic Reading | A period for the reading of hourly archives (0-60 min). Value 0 disables the reading. | min | 0 min |
Wake Up Sequence Length | Length of 'wake-up' data sequence, which is sent before the request after a longer communication pause. | 0 .. 50 bytes | 25 bytes |
Wake Up Each Query | Insert 'wake-up' data sequence before each request. | YES/NO | NO |
Wake Up Character | Form 'wake-up' data sequence from the specified characters. | 0 .. 255 | 255 |
Group Source Address | Group source address (address of the D2000 KOM process). | 0 .. 65535 | 0 |
Source Address | Source address (address of the D2000 KOM process). | 0 .. 255 | 0 |
| Full Debug | A high level of communication tracking, the received values of I/O tags and other debug information is shown. | YES/NO | NO |
I/O tag configuration
Possible value types of I/O tags: Di, Ai, Ci, TxtI, TiA.
The ELCOR-2 device
Table 2 contains the list of main parameters of the device.
Tables 3 to 8 contains the list of variable configuration and informative data according to the parameter type. DESC(ind) parameter represents the common data of all parameters. It describes the quantity. The current value of quantity can be acquired by the configuration of the I/O tag with numerical address - index ind (number from 1 and higher). To find out the technical units - configure text of I/O tag with address UNIT(ind).
Table 2 - Device parameters - Main device parameters
| Object description | Value type | Address | Units |
|---|---|---|---|
| The serial number of the device | Ci, TxtI | SN | |
| Referential temperature | Ai | TB | °C |
| Referential pressure | Ai | PB | kPa |
| Firmware version | TxtI | FW | |
| Station name | TxtI | DESC | |
| CO2 concentration | Ai | TAB(0) | % |
| N2 concentration | Ai | TAB(1) | % |
| Heat of combustion | Ai | TAB(2) | MJ/m3 |
| Relative density | Ai | TAB(3) | |
| H2 concentration | Ai | TAB(4) | % |
| H2S concentration | Ai | TAB(5) | % |
| He concentration | Ai | TAB(6) | % |
| H2O concentration | Ai | TAB(7) | % |
| O2 concentration | Ai | TAB(8) | % |
| Ar concentration | Ai | TAB(9) | % |
| CO concentration | Ai | TAB(10) | % |
| C1H4 concentration | Ai | TAB(11) | % |
| C2H6 concentration | Ai | TAB(12) | % |
| C3H8 concentration | Ai | TAB(13) | % |
| iC4H10 concentration | Ai | TAB(14) | % |
| nC4H10 concentration | Ai | TAB(15) | % |
| iC5H2 concentration | Ai | TAB(16) | % |
| nC5H2 concentration | Ai | TAB(17) | % |
| C6H14 concentration | Ai | TAB(18) | % |
| C7H16 concentration | Ai | TAB(19) | % |
| C8H18 concentration | Ai | TAB(20) | % |
| C9H20 concentration | Ai | TAB(21) | % |
| C10H22 concentration | Ai | TAB(22) | % |
Table 3 - Device parameters - Analog values
| Object description | Value type | Address | Units |
|---|---|---|---|
| Analog value - transducer serial No. | TxtI, Ci | SN(ind) | |
| Analog value - the upper limit of measuring range | Ai | HL(ind) | |
| Analog value - the lower limit of measuring range | Ai | LL(ind) | |
| Analog value - technical units | TxtI | UNIT(ind) | |
| Analog value - name | TxtI | DESC(ind) |
Table 4 - Device parameters - Counter
| Object description | Value type | Address | Units |
|---|---|---|---|
| Counter - serial number of gas meter | TxtI, Ci | SN(ind) | |
| Counter - technical units | TxtI | UNIT(ind) | |
| Counter - name | TxtI | DESC(ind) |
Table 5 - Device parameters - Error counter
| Object description | Value type | Address | Units |
|---|---|---|---|
| Error counter - primary counter number | TxtI, Ci | CNT(ind) | |
| Error counter - technical units | TxtI | UNIT(ind) | |
| Error counter - name | TxtI | DESC(ind) |
Table 6 - Device parameters - Standard counter
| Object description | Value type | Address | Units |
|---|---|---|---|
| Standard counter - primary counter number | TxtI, Ci | CNT(ind) | |
| Standard counter - calculation number | TxtI, Ci | CLC(ind) | |
| Standard counter - technical units | TxtI | UNIT(ind) | |
| Standard counter - name | TxtI | DESC(ind) |
Table 7 - Device parameters - Conversion factor
| Object description | Value type | Address | Units |
|---|---|---|---|
| Conversion factor - analogue (pressure) number | Ci | CNTP(ind) | |
| Conversion factor - analogue (temperature) number | Ci | CNTT(ind) | |
| Conversion factor - pressure error volume | Ai | DEFVALP(ind) | kPa |
| Conversion factor - temperature error volume | Ai | DEFVALT(ind) | °C |
| Conversion factor - compressibility error volume | Ai | DEFVALK(ind) | |
| Conversion factor - technical units | TxtI | UNIT(ind) | |
| Conversion factor - name | TxtI | DESC(ind) |
Table 8 - Device parameters - Standard flow rate
| Object description | Value type | Address | Units |
|---|---|---|---|
| Standard flow rate - primary flow number | Ci | CNT(ind) | |
| Standard flow rate - calculation number | Ci | CLC(ind) | |
| Standard flow rate - technical units | TxtI | UNIT(ind) | |
| Standard flow rate - name | TxtI | DESC(ind) |
The microELCOR-2 device
As an address of the I/O tag, also the data from "Address" or "Alternate address" columns can be used.
Table 9 - Actual values
| Object description | Value type | Address | Default address | Units |
|---|---|---|---|---|
| Primary volume | Ai | OH.1 | V | m3 |
| Standard volume | Ai | OH.2 | VN | Nm3 |
| Error primary volume | Ai | OH.3 | VEST | m3 |
| Error standard volume | Ai | OH.4 | VNEST | Nm3 |
| Primary flow rate | Ai | OH.5 | Q | m3/hour |
| Standard flow rate | Ai | OH.6 | QN | Nm3/hour |
| Compressibility ratio | Ai | OH.7 | K | |
| Actual pressure | Ai | OH.8 | P | kPa |
| Actual temperature | Ai | OH.9 | T | K |
| Calculation number | Ai | OH.10 | Z | |
| Device temperature | Ai | OH.11 | TPR | °C |
| Operating value - rest (only in VF input) | Ai | OH.12 | VZB |
Table 10 - Service data
| Object description | Value type | Address | Default address | Units |
|---|---|---|---|---|
| Type + serial number | TxtI | SE.1 | VCE | |
| The serial number of the temperature sensor | TxtI | SE.2 | VCT | |
| The serial number of the pressure transducer | TxtI | SE.3 | VCP | |
| Version SW+HW | TxtI | SE.4 | VER | |
| Customer number | TxtI | SE.5 | CZ | |
| The serial number of the gas meter | TxtI | SE.6 | PVC | |
| Network address | TxtI | SE.7 | ADR | |
| Constant of gas meter | Ci | SE.8 | KP | 0=1, 1=0.1, 2=0.01, 6=100, 7=10 |
| Measuring interval | Ci | SE.9 | IM | |
| Interval of data sending through a serial line | Ci | SE.10 | IV | |
| Start hour of the gas day | Ci | SE.11 | CD | |
| Start of measurement | TiA | SE.12 | DSM | |
| Date and time of the device | TiA | SE.13 | DAT | |
| Battery capacity | Ci | SE.14 | BAT | % |
| Actual status | TxtI | SE.15 | OS | |
| Configuration bytes | TxtI | SE.16 | KB | |
| The communication speed of a serial line | Ci | SE.17 | RK | 4=4800, 5=9600, 6=19200 |
| CRC 51 | Ci | SE.18 | C1 | |
| CRC MSP 430 | Ci | SE.19 | C2 | |
| CRC EEPROM1 | Ci | SE.20 | C3 | |
| CRC EEPROM2 | Ci | SE.21 | C4 | |
| CRC EEPROM3 | Ci | SE.22 | C5 | |
| Battery voltage | Ai | SE.23 | UPRHEX | V |
| Display configuration | Ci | SE.24 | KDIS | |
| Bits of permission to write the items | TxtI | SE.25 | W_RUN | |
| Customer's region | TxtI | SE.26 | REGION | |
| Saving interval in the hourly archive | Ci | SE.27 | IU | |
| Quantity of diff. pulses between IMP and IMP1 | Ci | SE.28 | IMP1_PI | 0=off, 255=on permanently |
| Input pulse ratio | Ci | SE.32 | I_V_DP | |
| Bits of write permission in RUN by a user | Ci | SE.33 | WU_RUN | |
| Actual status 2 | Ci | SE.34 | OS2 | |
| The setting of pulse ratio of gas meter VF on m3 | Ci | SE.35 | KPVF |
Table 11 - Parameters
| Object description | Value type | Address | Default address | Units |
|---|---|---|---|---|
| Base pressure | Ai | PA.1 | PN | kPa |
| Base temperature | Ai | PA.2 | PT | °C |
| Default pressure | Ai | PA.3 | PEST | kPa |
| Default temperature | Ai | PA.4 | TEST | °C |
| Default compressibility level | Ai | PA.5 | SK | |
| Min. pressure limit | Ai | PA.6 | PMIN | kPa |
| Max. pressure limit | Ai | PA.7 | PMAX | kPa |
| Min. temperature limit | Ai | PA.8 | TMIN | °C |
| Max. temperature limit | Ai | PA.9 | TMAX | °C |
| Limit of max. flow rate | Ai | PA.10 | QMAX | m3/hour |
| Method of compressibility calculation | Ci | PA.11 | MK | |
| CO2 concentration | Ai | PA.12 | KCO2 | % |
| N2 concentration | Ai | PA.13 | KN2 | % |
| H2 concentration | Ai | PA.14 | KH2 | % |
| Relative density | Ai | PA.15 | KD | % |
| Heat of combustion | Ai | PA.16 | KHON | kWh/m3 |
Table 12 - Minimums/maximums
| Object description | Value type | Address | Default address | Technical units |
|---|---|---|---|---|
| Pressure under the limit | Ai | MI.1 | PMMIN | kPa |
| Time of pressure under the limit | TiA | MI.2 | DPMMIN | |
| Pressure above the limit | Ai | MI.3 | PMMAX | kPa |
| Time of pressure above the limit | TiA | MI.4 | DPMMAX | |
| The temperature under the limit | Ai | MI.5 | TMMIN | °C |
| Time of temperature under the limit | TiA | MI.6 | DTMMIN | |
| Temperature above the limit | Ai | MI.7 | TMMAX | °C |
| Time of temperature above the limit | TiA | MI.8 | DTMMAX | |
| Flow rate above the limit | Ai | MI.9 | QMMAX | m3/hour |
| Time of flow rate above the limit | TiA | MI.10 | DQMMAX | |
| Time of reset of minimums/maximums | TiA | MI.11 | DNUL |
Parameters and minimums/maximums are read in a period which is set by the Static Data Read Period protocol parameter.
Literature
- Description of system μ-ELCOR and microELCOR-2 - operating schedule (Elgas 1. 6. 2006)
- Reference books of producer ELGAS s.r.o.
Changes and modifications
-
Document revisions
- Ver. 1.0 - April 22th, 2009 - the creation of the document.
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