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Byte
Field
4
Number of registers to write - high byte
5
Number of registers to write - low byte
6
Number of data bytes to follow (n)
7
Value at first register
...
...
6+n
Value at last register
7+n/8+n
Error check CRC
Standard response from SGC controller server for function 16
Byte
Field
0
Server address
1
Function code (0x10)
2
First register address - high byte
3
First register address - low byte
4
Number of registers written - high byte
5
Number of registers written - low byte
6/7
Error check CRC
Command from Modbus client for function 3
Byte
Field
0
Server address
1
Function code (0x3)
2
First register address - high byte
3
First register address - low byte
4
Number of registers to read - high byte
5
Number of registers to read - low byte
6/7
Error check CRC
Standard response from SGC controller server for function 3
Byte
Field
0
Server address
1
Function code (0x03)
2
Byte count (n)
3
First register - high byte
4
First register - low byte
...
...
1+n
Last register - high byte
2+n
Last register - low byte
3+2n/4+2n
Error check CRC
User manual 4189341340A EN
Comments
Number of registers to write must be between 1 to
255
Comments
As configured in the controller.
16-bit register address, register address map is
described in the Register map.
Number of registers that have been written.
Comments
As configured in the controller.
16-bit register address, register address map is
described in the Register map.
Number of registers to read must be between 1 to
255
Comments
As configured in the controller.
Equals to number of registers to be read times two.
8-bit even number between 2 to 250.
Number of registers that have been written.
Page 66 of 76
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