REXROTH EFC 3600 - Page 207

Message start Transmission time for 3.5 bytes
Slave address 01H
ModBus function code 17H
Higher byte of read register start address 01H
Lower byte of read register start address 14H
Higher byte of read register number 00H
Lower byte of read register number 02H
Higher byte of write register start address 01H
Lower byte of write register start address 17H
Higher byte of write register number 00H
Lower byte of write register number 02H
Bytes of data for writing 04H
Higher byte of data in register 0109H 00H
Lower byte of data in register 0109H C8H
Higher byte of data in register 010AH 00H
Lower byte of data in register 010AH C8H
CRC lower byte 38H
CRC higher byte E3H
Message end Transmission time for 3.5 bytes
Tab. 13-21: Function 0x17_Request from RTU master
Message start
Transmission time for 3.5 bytes
Slave address 01H
ModBus function code 17H
Bytes of read register 04H
Higher byte of read register 0100H 00H
Lower byte of read register 0100H 32H
Higher byte of read register 0101H 00H
Lower byte of read register 0101H 32H
CRC lower byte D9H
CRC higher byte 3DH
Message end Transmission time for 3.5 bytes
Tab. 13-22: Function 0x17_Response from RTU slave
Error code and exception code
If a slave receives the request without a communication error, but cannot han-
dle it, the slave will return an exception response which includes error code and
EFC 3600
Bosch Rexroth AG
Communication Protocols
DOK-RCON03-EFC-3600***-IT03-EN-P
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