Circutor CBS8 (Available until stocks) Manual de usuario descargar pdf (Pagina 36)

----- Relay Station CBS-8 -------- --- Page No. 35

10.3.- MODBUS

Protocol

The CBS-8 system analyzer can communicate via MODBUS

protocol, as described below.

The MODBUS

protocol uses RTU mode (Remote terminal Unit). Each

8-bit byte in a message contains two hexadecimal 4 bit characters.

The format for each byte in RTU mode is:

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

2 hexadecimal characters in each 8

bit field of the message.

* Bits per byte : 8 data bits

* Field CHECK- ERROR : CRC (Cyclical Redundancy Check).

MODBUS FUNCTIONS USED IN THE CBS-8

FUNCTION 03h and 04h Reading n Words (16 bits - 2 bytes). The reading

function used by all of the CBS-8 parameters.

FUNCTION 06h Writing one WORD (16 bits - 2 bytes) in one

position in the memory.

FUNCTION 10h Writing n WORDS (16 bits - 2 bytes) in

consecutive positions in the memory.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41

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Circutor CBS8 (Available until stocks) Manual de usuario Pagina 36