Lower byte of start address 00H
Higher byte of data 00H
Lower byte of data 02H
CRC lower byte C5H
CRC higher byte F7H
End Transmission time for 3.5 bytes
Fig.13-12: Function 0x03_Request from RTU master
Start Transmission time for 3.5 bytes
Slave address 01H
ModBus function code 03H
Bytes of data 04H
Higher byte of data in register 0100H 00H
Lower byte of data in register 0100H 05H
Higher byte of data in register 0101H 00H
Lower byte of data in register 0101H 00H
CRC lower byte EAH
CRC higher byte 32H
End Transmission time for 3.5 bytes
Fig.13-13: Function 0x03_Response from RTU slave
● Function 0x06: Write one register word
Frequent writing may damage the internal regis‐
ters!
– When data is written into the internal registers, there is a limit on the writing times.
The register address may be damaged once the writing times is beyond the writ‐
ing limit. So please avoid frequency writing!
– For details of user writing permission, please see chapter 17.2.1 "Description of
Attribute Symbols in Parameter Tables" on page 195.
Example: Write 0000H to communication register address 0005H of the slave fre‐
quency converter with address 01H. The frame structure is described in the tables
below:
Start
Transmission time for 3.5 bytes
Slave address 01H
Bosch Rexroth AG
Communication Protocols
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
176/235
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