GE Industrial Solutions WattStation Pedestal EVSE Charger MODBUS Register Mapping Guide - Manual (Page 11)

WattStation TM EV Charger MODBUS Register Guide
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• M MO OD DBBU USS FFC C 44 RReessppoonnssee (note N = Quantity of input registers)
Field Length (bytes) Value (hex)
Function Code 1 0x04
Byte Count 1 2 × N
Register Value 2 × N
Table – 3.5
3.3.3 Function Code 6 (0x06): Write single register
Function code 6 is used to write a single holding register in EVSE. The MODBUS Function code 6
Request PDU specifies the address if the register to be written. In the PDU Registers are addressed
starting at zero. Therefore registers numbered 1 is addressed as 0.
MODBUS FC 6 Request
Field Length (bytes) Value (hex)
Function Code 1 0x06
Register Address 2 0x0000 to 0xFFFF
Register Value 2 0x0000 to 0xFFFF
Table – 3.6
The register data in the response message are packed as two bytes per register, with the binary
contents right justified within each byte. For each register, the first byte contains the high order bits
and the second contains the low order bits.
• M MO OD DBBU USS FFC C 66 RReessppoonnssee
Field Length (bytes) Value (hex)
Function Code 1 0x06
Register Address 2 0x0000 to 0xFFFF
Register Value 2 0x0000 to 0xFFFF
Table – 3.7
3.3.4 Function Code 16 (0x10): Write Multiple Holding Registers
Function code 16 (0x10) is used to write data into a contiguous block of holding registers in EVSE.
The MODBUS Function code 16 (0x10) Request PDU specifies the starting register address, the number
of registers to be written, the data length, and the data values. In the PDU Registers are addressed
starting at zero. Therefore registers numbered 1-16 are addressed as 0-15.