GE 869 Communications Manual page 92

MODBUS PROTOCOL
10-8
Table 10-18: Login as Administrator Function Format continued
Data 10 Data 11 Data 12 Data 13 Data 14 Data 15 Data 16 Data17 Data 18 Data 19 Data 20 Data 21 Data 22
0 0 3000 0
Commands using Modbus Function 10H (Store Multiple Setpoints)
Sending commands requires writing 4 bytes to the Command address register using the
Modbus Function 10H (Store Multiple Setpoints). The 4 bytes are the function and the
command values. The function value is always 05.
Table 10-19: Modbus Commands registers
Description
Command Register
Command Function Register
Table 10-20: Examples of Command values
Command Value
1
96
98
105
4096
Function Format for "Clear All" command:
Table 10-21: Function Format for "Clear All" command
Slave # Function Data Starting
Address
FE 10 0080
Table 10-22: Function Format for "Clear Energy Use Data" command
Slave # Function Data Starting
Address
FE 10 0080
Table 10-23: Function Format for "Force Virtual Input 1" command
Slave # Function Data Starting
Address
FE 10 0080
Commands using Modbus Function 05H (Execute Operation)
Specific command operations such as described above can also be performed using
function code 05H.
Table 10-24: Format for Function Code 05H
Master Transmission
Slave Address
Function Code
Operation Code
Code Value
CRC
0 0 0 0
Memory Map Address
DEC
40129
40130
Value Description
Reset
Clear All Records
Clear Events
Clear Energy Use Data
Force Virtual Input 1
Number of Byte count
Setpoints
0002 04
Number of Byte count
Setpoints
0002 04
Number of Byte count
Setpoints
0002 04
Byte# Example
1 FE
1 05
2 00 01
2 FF 00
2 DF 6A
869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 10: MODBUS PROTOCOL
0 0 0 0
HEX
0x0080
0x0081
Data 1 Data 2
0005 0060
Data 1 Data 2
0005 0069
Data 1 Data 2
0005 1000
Description
message for slave # 254
execute operation
operation code
perform function
CRC error code
0