Circutor CVMk2 Series Bedienungsanleitung PDF herunterladen (Seite 123)

123

CVM

OPERATION

123

CVM

COMMUNICATION

8. COMMUNICATIONS

8.1. MODBUS/RTU PROTOCOL ©

CVMk2 uses the Modbus/RTU © as the communications protocol on the COM2 port. This is a

question-response based protocol. The question frame format is:

NPAAXXXXYYYY CRC.

PN: The number of the peripheral congured for the system.

AA: Modbus function to be executed.

XXXX: System's memory position where the function should be begin. (Example: If AA=04 the

function is read only).

YYYY: Read positions, from the XXXX position, to be read or written. (This depends on the AA

function).

CRC: Code for detecting 16 bit errors. (automatically generated).

The response format is

NPAABBCCCC..CRC

PN: Number of the peripheral that responds

AA: Function that responds.

BB: Number of bytes in the response.

CCCC: Registry value.

...

CRC: Error detection registry.

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Circutor CVMk2 Series Bedienungsanleitung Seite 123