ModBus function code 06H
Higher byte of write register address 00H
Lower byte of write register address 05H
Higher byte of write data 00H
Lower byte of write data 00H
CRC lower byte 99H
CRC higher byte CBH
End Transmission time for 3.5 bytes
Fig.13-14: Function 0x06_Request from RTU master
Start Transmission time for 3.5 bytes
Slave address 01H
ModBus function code 06H
Higher byte of write register address 00H
Lower byte of write register address 05H
Higher byte of write data 00H
Lower byte of write data 00H
CRC lower byte 99H
CRC higher byte CBH
End Transmission time for 3.5 bytes
Fig.13-15: Function 0x06_Response from RTU slave
● Function 0x08: Diagnostics
Example: To test the communication loop of 2 continuous words 1234H and 5678H
with frequency converter slave address 01H, the frame structure is described in the
tables below:
Start
Transmission time for 3.5 bytes
Slave address 01H
ModBus function code 08H
Higher byte of sub-function 00H
Lower byte of sub-function 00H
Higher byte of test word 1 12H
Lower byte of test word 1 34H
Higher byte of test word 2 56H
Lower byte of test word 2 78H
CRC lower byte 73H
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
Bosch Rexroth AG
Communication Protocols
177/235
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