Bosch Rexroth EFC 3600 Operating Instructions Manual page 180

Bosch Rexroth AG
Communication Protocols
CRC higher byte
End
Fig.13-16: Function 0x08_Request from RTU master
Start
Slave address
ModBus function code
Higher byte of sub-function
Lower byte of sub-function
Higher byte of test word 1
Lower byte of test word 1
Higher byte of test word 2
Lower byte of test word 2
CRC lower byte
CRC higher byte
End
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
Slave address
ModBus function code
Higher byte of write register start address
Lower byte of write register start address
Higher byte of register number
Lower byte of register number
Bytes of data
Higher byte of data in register 0109H
Lower byte of data in register 0109H
Higher byte of data in register 010AH
Lower byte of data in register 010AH
CRC lower byte
178/235
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
33H
Transmission time for 3.5 bytes
Transmission time for 3.5 bytes
01H
08H
00H
00H
12H
34H
56H
78H
73H
33H
Transmission time for 3.5 bytes
Transmission time for 3.5 bytes
01H
10H
01H
14H
00H
02H
04H
00H
32H
00H
32H
DEH