VEGA VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) Modbus and Levelmaster protocol Approval according to LPR radio standard - Manual (Page 74)

10 .4 Modbus RTU commands
FC3 Read Holding Register
With this command, any number (1-127) of holding registers can be read out. The start register, from
which the readout should start, and the number of registers are transmitted.
Request:
Parameter Length Code/Data
Function Code 1 Byte 0x03
Start Address 2 Bytes 0x0000 to 0xFFFF
Number of Registers 2 Bytes 1 to 127 (0x7D)
Response:
Parameter Length Code/Data
Function Code 1 Byte 0x03
Start Address 2 Bytes 2*N
Register Value N*2 Bytes Data
FC4 Read Input Register
With this command, any number (1-127) of input registers can be read out. The start register, from
which the readout should start, and the number of registers are transmitted.
Request:
Parameter Length Code/Data
Function Code 1 Byte 0x04
Start Address 2 Bytes 0x0000 to 0xFFFF
Number of Registers N*2 Bytes 1 to 127 (0x7D)
Response:
Parameter Length Code/Data
Function Code 1 Byte 0x04
Start Address 2 Bytes 2*N
Register Value N*2 Bytes Data
FC6 Write Single Register
With this function code an individual holding register can be written.
74 VEGAPULS 62 • Approval according to LPR radio standard
10 Supplement
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