750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE 3 - 1
750/760 Feeder Management Relay
Chapter 3: Modbus Functions
GE
Grid Solutions
Modbus Functi ons
Supported Modbus 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
below. Subsequent sections describe each function code in detail.
Table 1: GE Multilin Modbus Function Codes
Code Definition Description Substitute
Hex Dec
01 1
Read Binary Status
Read one or more consecutive
binary status bits from the 750/760.
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02 2 ---
03 3
Read Actual Values
Or Setpoints
Read actual value or setpoint
registers from one or more
consecutive memory map register
addresses.
04h
04 4 03h
05 5 Execute Operation
Perform 750/760 specific
operations.
10h
06 6
Store Single
Setpoint
Write a specific value into a single
setpoint register.
10h
10 16
Store Multiple
Setpoints
Write specific values into one or
more consecutive setpoint registers.
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