GE Power Management 750/760 Feeder Management Relay 16-
5
16 COMMUNICATIONS 16.3 MODBUS PROTOCOL
16
16.3.4 SUPPORTED FUNCTION CODES
Modbus officially defines function codes from 1 to 127 though only a small subset is generally needed. The
750/760 relays support some of these functions, as summarized in the following table. Subsequent sections
describe each function code in detail.
Table 16–1: GE POWER MANAGEMENT 750/760 MODBUS FUNCTION CODES
FUNCTION CODE MODBUS DEFINTION GE POWER MANAGEMENT
DEFINITION
HEX DEC
01 1 Read Coil Status Read Binary Status
02 2 Read Input Status Read Binary Status
03 3 Read Holding Registers Read Actual Values or Setpoints
04 4 Read Input Registers Read Actual Values or Setpoints
05 5 Force Single Coil Execute Operation
06 6 Preset Single Register Store Single Setpoint
10 16 Preset Multiple Registers Store Multiple Setpoints
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