CRC higher byte 33H
End Transmission time for 3.5 bytes
Fig.13-16: Function 0x08_Request from RTU master
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
CRC higher byte 33H
End Transmission time for 3.5 bytes
Fig.13-17: Function 0x08_Response from RTU slave
● Function 0x10: Write N register words, range 1 ~ 16.
Example: To modify 2 continuous registers start from 0114H with words 0032H and
0032H with slave frequency converter address 01H. The frame structure is descri‐
bed in the tables below:
Start
Transmission time for 3.5 bytes
Slave address 01H
ModBus function code 10H
Higher byte of write register start address 01H
Lower byte of write register start address 14H
Higher byte of register number 00H
Lower byte of register number 02H
Bytes of data 04H
Higher byte of data in register 0109H 00H
Lower byte of data in register 0109H 32H
Higher byte of data in register 010AH 00H
Lower byte of data in register 010AH 32H
CRC lower byte DEH
Bosch Rexroth AG
Communication Protocols
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
178/235
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