WattStation
TM
EV Charger MODBUS Register Guide
2 GE Energy ©2012 GE Company All Rights Reserved
CCO
ON
NTTEEN
NTTSS
1!
Publications........................................................................................................................................................................................... 3!
2!
MODBUS Communication Overview ......................................................................................................................................... 4!
2.1! General Overview............................................................................................................................................................................... 4!
2.2! MODBUS/TCP Overview................................................................................................................................................................... 6!
3!
EVSE MODBUS Communication Architecture ....................................................................................................................... 7!
3.1! MODBUS/TCP Communication Topologies ............................................................................................................................ 7!
3.2! MODBUS Access Control................................................................................................................................................................. 9!
3.3! MODBUS Function Codes Supported........................................................................................................................................ 9!
3.4! MODBUS Exception Codes Supported....................................................................................................................................13!
3.5! MODBUS Operations.......................................................................................................................................................................14!
4!
EVSE MODBUS Register Map.......................................................................................................................................................14!
4.1! EVSE MODBUS Register Data Module Information Registers......................................................................................14!
4.2! EVSE MODBUS Operation Status Registers..........................................................................................................................16!
4.3! EVSE Identification Register ........................................................................................................................................................17!
4.4! EVSE Current Charging Information Diagnostic Registers ...........................................................................................18!
4.5! EVSE MODBUS Diagnostic Registers .......................................................................................................................................20!
4.6! EVSE MODBUS Connection Table Diagnostic Registers .................................................................................................21!
4.7! Summary of EVSE MODBUS Data Registers ........................................................................................................................23!
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