Write Multiple Registers - Siemens SITRANS F Operating Instructions Manual

Communication modules modbus rtu rs485

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Table Of Contents

Table of Contents

Table 6- 9

Message byte

Slave address

Function code

Coil address

New coil value

CRC-16

Exception response

The exception response message contains the same slave address as the command

message.

The function code of the exception message is actually a value of 80 hex plus the original

function code of 05hex . The exception code indicates where the error occurred in the

command message. A complete listing of exception codes is shown in a later chapter

Table 6- 10

Message byte

Slave address

Function code

Exception code

CRC-16

Examples

Coil 0 (Restart Modbus communication)

To activate a new baudrate and parity/framing the coil 0 (restart Modbus communication)

must be send. Otherwise a power down/up initiate a new baudrate and parity/framing:

● Query: 1,5,0,0,255,0,140,58 (Hex 01,05,00,00,FF,00,8C,3A) (Set coil 0 to 0xFF00)

● Receive: 1,5,0,0,255,0,140,58 (Hex 01,05,00,00,FF,00,8C,3A) (Restart Modbus

6.5