
14.3.2 Modbus Interface
The Modbus communication is via RS485 interface, see descriptions on RS485+
chapter 8.1 "Wiring Diagram" on page 31
14.3.3 Modbus Function and Message Format
Supported functions
The main function of Modbus is to read and to write parameters. Different func-
tion codes decide different operation requests. Modbus functions managed by
VFC 3210 and their limits are shown in the table below:
Code
Function name
Broadcast
Max. value of N
3 = 0x03
Read N register words
NO
16
6 = 0x06
Write one register word
YES
–
8 = 0x08
Diagnosis
NO
–
16 = 0x10
Write N register words
YES
16
23 = 0x17
Read/write N register words
NO
16
Tab. 14-3: VFC 3210 Modbus functions and limits
'Read' and 'Write' are considered from the prospect of the master
station.
Modbus message formats are different according to the function codes shown
below.
Slave
No.
0x03
Address of 1
st
word
Number of words
CRC16
Hi | Lo
Hi | Lo
Lo | Hi
Tab. 14-4: Function 3_Request from the master
Slave
No.
0x03
Number of bytes
1
st
word value
–
Last word value
CRC16
Depends on
master request
Hi | Lo
–
Hi | Lo
Lo | Hi
Tab. 14-5: Function 3_Response from the slave
Slave
No.
0x06
Address of word
Value of word
CRC16
Hi | Lo
Hi | Lo
Lo | Hi
Tab. 14-6: Function 6_Master request and slave response (in same format)
Bosch Rexroth AG
Communication
VFC 3210
192/253
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