489
Communications Guide
http://www.GEindustrial.com/multilin i
GE Multilin
Table of Contents
MODBUS PROTOCOL Electrical Interface..................................................................................................................................1
Modbus RTU Description......................................................................................................................1
Data Frame Format and Data Rate.......................................................................................................1
Data Packet Format................................................................................................................................2
CRC-16 Algorithm..................................................................................................................................3
Timing.....................................................................................................................................................3
MODBUS FUNCTIONS Supported Functions.............................................................................................................................3
Function Codes 03/04: Read Setpoints / Actual Values......................................................................4
Function Code 05: Execute Operation..................................................................................................5
Function Code 06: Store Single Setpoint.............................................................................................5
Function Code 07: Read Device Status................................................................................................6
Function Code 08: Loopback Test.........................................................................................................6
Function Code 16: Store Multiple Setpoints........................................................................................7
Function Code 16: Performing Commands.........................................................................................8
Error Responses.....................................................................................................................................8
MODBUS MEMORY MAP Memory Map Information.....................................................................................................................9
User-Definable Memory Map Area......................................................................................................9
Event Recorder.......................................................................................................................................9
Waveform Capture..............................................................................................................................10
Dual Setpoints......................................................................................................................................10
Passcode Operation.............................................................................................................................10
489 Memory Map.................................................................................................................................11
Memory Map Data Formats................................................................................................................40
DNP PROTOCOL Device Profile Document.....................................................................................................................46
Implementation Table.........................................................................................................................47
Default Variations................................................................................................................................48
DNP POINT LISTS Binary Input / Binary Input Change (Objects 01/02)..........................................................................49
Binary / Control Relay Output Block (Objects 10/12).........................................................................51
Binary / Frozen Counter (Objects 20/21).............................................................................................52
Analog Input / Input Change (Objects 30/32).....................................................................................53
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