----- Supply network analyzer CVMk and CVMk-ITF ------ Page Nº 58
12.6. APPENDIX F : MODBUS © protocol
The CVMk power meter has also the MODBUS © protocol .
When the CVMk is configured to work with MODBUS protocol , it use the
RTU mode (Remote terminal Unit ) . Each 8-bit byte in a message contains two
4-bits hexadecimal characters.
The format for each byte in RTU mode is :
* Code : 8- bit binary , hexadecimal 0-9, A-F
Two hexadecimal characters
contained
in each 8-bit field of the message .
* Bits per Byte : 8 data bits
* Error Check Field : Cyclical Redundancy Check ( CRC ) .
MODBUS FUNCTIONS :
FUNCTION 3 or 4 Reads the n Words (16 bits- 2 bytes ). It uses this function
to read all the electrical parameters of the CVMk. This
registers are longs of 32 bits ; In this case It is necessary
to read two Words.
( 4 bytes - XX XX XX XX ).
FUNCTION 6 Writing of 1 Word. This function is used to change from
MODBUS to CIRBUS.
Valid Register 0
Valid value 0
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