SEDEMAC GC1100 User Manual

GC1100 SEDEMAC
Page | 45
Byte
Field
Remarks
two. 8-bit even number between 2 to 250
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
Function 16 (0x10): Write Holding Registers
This function is used to issue certain commands to the controller. The command-response pattern is as
shown in Table 34 and Table 35.
Table 34: Command from MODBUS master for Function 16
Byte
Field
Remarks
0
Slave address
As configured in genset controller
1
Function code (0x10)
2
First register address – high byte
16-bit register address, register address map
is described in Table 38
3
First register address – low byte
4
Number of registers to write – high byte
Number of registers to write must be between
1 to 255
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
Table 35: Normal response from genset controller slave for Function 16
Byte
Field
Remarks
0
Slave address
As configured in genset controller
1
Function code (0x10)
2
First register address – high byte
16-bit register address, register address map
is described in Table 38
3
First register address – low byte
4
Number of registers written – high byte
Number of registers that have been written
5
Number of registers written – low byte
6/7
Error check CRC
Function 3 (0x03): Read Holding Registers
This function is used to read holding registers that is the commands that have been issued to the
controller. The command-response pattern is as shown in Table 36 and Table 37.
Table 36: Command from MODBUS master for Function 3
Byte
Field
Remarks
0
Slave address
As configured in genset controller
1
Function code (0x03)

SEDEMAC GC1100 Specifications

General

Brand	SEDEMAC
Model	GC1100
Category	Controller
Language	English