GE 869 - Page 92

10-8 869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE
MODBUS PROTOCOL CHAPTER 10: MODBUS PROTOCOL
Table 10-18: Login as Administrator Function Format continued
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
Table 10-20: Examples of Command values
Function Format for “Clear All” command:
Table 10-21: Function Format for “Clear All” command
Table 10-22: Function Format for “Clear Energy Use Data” command
Table 10-23: Function Format for “Force Virtual Input 1” command
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
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 0 0 0 0 0 0 0 0 0
Description Memory Map Address
DEC HEX
Command Register 40129 0x0080
Command Function Register 40130 0x0081
Command Value Value Description
1 Reset
96 Clear All Records
98 Clear Events
105 Clear Energy Use Data
4096 Force Virtual Input 1
Slave # Function Data Starting
Address
Number of
Setpoints
Byte count Data 1 Data 2
FE 10 0080 0002 04 0005 0060
Slave # Function Data Starting
Address
Number of
Setpoints
Byte count Data 1 Data 2
FE 10 0080 0002 04 0005 0069
Slave # Function Data Starting
Address
Number of
Setpoints
Byte count Data 1 Data 2
FE 10 0080 0002 04 0005 1000
Master Transmission Byte# Example Description
Slave Address 1 FE message for slave # 254
Function Code 1 05 execute operation
Operation Code 2 00 01 operation code
Code Value 2 FF 00 perform function
CRC 2 DF 6A CRC error code