Bosch Rexroth EFC 3600 Operating Instructions Manual page 181

DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
CRC higher byte
End
Fig.13-18: Function 0x10_Request from RTU master
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
CRC lower byte
CRC higher byte
End
Fig.13-19: Function 0x10_Response from RTU slave
● Function 0x17: Read/Write N register words, range 1 ~ 16.
Example: To read data in 2 continuous registers starting from address 0114H, write
00C8H and 00C8H to 2 continuous registers starting from address 0117H. The
frame structure is described in the tables below:
Start
Slave address
ModBus function code
Higher byte of read register start address
Lower byte of read register start address
Higher byte of read register number
Lower byte of read register number
Higher byte of write register start address
Lower byte of write register start address
Higher byte of write register number
Lower byte of write register number
Bytes of data for writing
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
Communication Protocols
DAH
Transmission time for 3.5 bytes
Transmission time for 3.5 bytes
01H
10H
01H
14H
00H
02H
00H
30H
Transmission time for 3.5 bytes
Transmission time for 3.5 bytes
01H
17H
01H
14H
00H
02H
01H
17H
00H
02H
04H
00H
C8H
00H
C8H
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