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Communications Guide
http://www.GEindustrial.com/multilin
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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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