Circutor CVM96 Series Manual do Utilizador descarregar pdf (Página 37)

----- Supply network analyzer CVM 96 ---------- ------- Page No. 36

10.4.- MODBUS © protocol

The CVM 96 analyzer can communicate by means of the MODBUS ©

protocol, as it is following described:

When the CVM 96 communicates with MODBUS protocol, it uses the RTU

mode (Remote Terminal Unit ). Each 8-bits byte in a message contains two 4-bits

hexadecimal characters.

The format for each byte in RTU mode is :

* Code : 8-bits binary, hexadecimal 0-9, A-F

Two hexadecimal characters

contained in each 8-bits field of the

message.

* Bits per Byte : 8 data bits

* Error Check Field : Cyclical Redundancy Check ( CRC ) .

MODBUS FUNCTIONS:

FUNCTION 01 Reading of relay state

FUNCTION 3 or 4 Reading of n Words (16 bits-2 bytes). This function

permits to read all the electrical parameters of the CVM

96. Each parameters is a 32-bits long, hence two words

are required to inquiry for a parameter.

( 4 bytes - XX XX XX XX ).

FUNCTION 05 Writing one relay

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 43 44

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