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Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Changes and modifications
Document revisions


Supported device types and versions



The ASCII Client/Server protocol is intended for parsing serial communication containing simple text-oriented data (data sentences) that conform to a template
StartMark Data1 Separator Data2 Separator .... DataN EndMark

StartMark, Separator and EndMark parameters can be configured within the station address.

It is also possible to periodically transmit text-oriented data with an identical template - with the fact that the StartMark, Separator and EndMark parameters for transmission can be different from those for reception.

Example of received data:

Sending<CR><LF>11.8<CR><LF>-17.519723239035<CR><LF>12.2<CR><LF>0.3312<CR><LF>1.465<CR><LF>0.01<CR><LF> 11.384611976362<CR><LF>

Setting individual parameters:

StartMark = ding<CR><LF>

Separator = <CR><LF>

EndMark = Sen


Note: this communication protocol is simpler than the Generic User Protocol and only offers simple value parsing. On the other hand, parsing does not need to be implemented in the ESL script, but is performed directly by the KOM process.


Communication line configuration



Category of communication line:



Communication station configuration



  • Communication protocol ASCII Client/Server.

  • Data Input section

    • Receiving enabled - the protocol processes input data.

    • Startup - text sequence indicating the start of data (StartMark). The end of the sequence must be followed by data.

    • Value delimiter - text sequence separating individual values ​​(Separator).

    • End mark - text sequence indicating the end of data (EndMark).

  • Data output section

    • Transmitting enabled - the protocol writes data with the period Data output period.

    • Startup - text sequence written at the beginning of the data (StartMark).

    • Value delimiter - text sequence separating individual recorded values ​​(Separator).

    • End mark - text sequence written at the end of the data (EndMark).

Note: StartMark, Separator and EndMark parameters can also contain special (control) characters in symbolic form, e.g. <CR> or <LF>. The following table lists the supported characters:



Table 1

Symbolic formCharacterASCII value
<NUL>
NUL0
<SOH>
SOH1
<STX>
STX2
<ETX>
ETX3
<EOT>
EOT4
<ENQ>
ENQ5
<ACK>
ACK6
<BEL>
BEL7
<BS>
BS8
<HT>
HT9
<LF>
LF10
<VT>
VT11
<FF>
FF12
<CR>
CR13
<SO>
SO14
<SI>
SI15
<DLE>
DLE16
<DC1>
DC117
<DC2>
DC218
<DC3>
DC319
<DC4>
DC4

20

<NAK>
NAK21
<SYN>
SYN22
<ETB>
ETB23
<CAN>
CAN24
<EM>
EM25
<SUB>
SUB26
<ESC>
ESC27
<FS>
FS28
<GS>
GS29
<RS>
RS30
<US>
US31
<SPACE>
SPACE32


Station protocol parameters



The following station parameters can be set:


Table 2


Full name

Description

UnitDefault value

Wait timeout

Waiting between data readings.sec0.2

Maximum read timeout

Maximum reading time of one data sentence (if data input is enabled in the station configuration).
If the data sentence is not fully read within this time, the state machine is reset and waiting for the startup sequence to arrive.

sec5

Data output period

Data transmission period (if transmission is enabled in the station configuration).

sec60

Moxa timeout

If the SerialOverUDP Device Redundant communication line is used, on which two serial servers are configured (e.g. Moxa NPort), the parameter specifies a timeout after which the redundant serial servers will be switched in the event of a communication error (if no data is received within this time limit).

sec120


I/O tag configuration



Possible value types of I/O tag: Ai, Ci, Ao, Co.


Input I/O tags:



Output I/O tags:



Note: it is possible to configure and use an I/O tag with the address IN and I/O tags IN_A, IN_B, IN_C, IN_D on a single station at the same time.
In a similar way, it is possible to configure and use an I/O tag with the address OUT and I/O tags OUT_A, OUT_B, OUT_C, OUT_D on a single station at the same time.



Changes and modifications



-


Document revisions



  • Ver. 1.0 - October 30, 2024 - Creating the document.


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