Circutor CVMk MODBUS 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


MODBUS RTU MASTER supports data reading from the analyzers Circutor CVMk.

Communication line configuration


Communication station configuration



Station protocol parameters

There can be defined the following parameters:

Table 1

Key wordFull nameMeaningUnitDefault value
RCRetry CountNumber of retry calls when an error in communication occurs.-2
RTRetry TimeoutDelay between retry calls if an error in communication occurs.ms200 millisec.
WFTWait First TimeoutFirst waiting on the response after sending a call.ms100 millisec.
WTWait TimeoutDelay between the readings of a response until it is completed.ms100 millisec.
MWRMax Wait RetryNumber of retry response reading until it is completed.-15

String with protocol parameters is written according to this rule:

Key_word=value;Key_word=value;...

Example:

RC=1;RT=500;

If a key word with valid value has not been found in the initial string, default value is used according to Table 1.

I/O tag configuration


I/O tags: Ai

Address – decimal number in the range of 0 to 65535 – number of MODBUS double register, or a hexadecimal number with a hash at the beginning (e.g. #0ABC).

The values are read by 2 registers and interpreted as a 4 byte integer. The addresses of values are described in literature about Circutor.

Literature


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Changes and modifications


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Document revisions


Communication protocols