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 word Full name Meaning Unit Default value
RC Retry Count Number of retry calls when an error in communication occurs. - 2
RT Retry Timeout Delay between retry calls if an error in communication occurs. ms 200 millisec.
WFT Wait First Timeout First waiting on the response after sending a call. ms 100 millisec.
WT Wait Timeout Delay between the readings of a response until it is completed. ms 100 millisec.
MWR Max Wait Retry Number 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.

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