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 Circutor CVMk analyzers.
Communication line configuration
- Communication line category: Serial.
- Parameters of the asynchronous line depending on the design and type of device connection – see literature about Circutor.
Communication station configuration
- Communication protocol: MODBUS Circutor CVMk.
- The station address is a number in the range of 0 up to 255 specified as a decimal number or as a hexadecimal number with a hash at the beginning (e.g. #1A).
Station protocol parameters
There can be defined the following parameters:
Table 1
| Keyword | Full name | Meaning | Unit | Default value |
|---|---|---|---|---|
RC | Retry Count | The number of request retries when an error in communication occurs. | - | 2 |
RT | Retry Timeout | Delay between request retries if an error in communication occurs. | ms | 200 millisec. |
WFT | Wait First Timeout | First waiting for the response after sending a request. | ms | 100 millisec. |
WT | Wait Timeout | Delay between the readings of a response until it is completed. | ms | 100 millisec. |
MWR | Max Wait Retry | The number of response reading retries until the response 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 keyword with a valid value has not been found in the initial string, the default value is used according to Table 1.
I/O tag configuration
I/O tags: Ai
Address – a number in the range of 0 to 65535 – number of MODBUS double register. It can be specified as a decimal number 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 the literature about Circutor.
Literature
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Changes and modifications
-
Document revisions
- Ver. 1.0 – May 9, 2000 – the creation of the document
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