Vega VEGABAR 86 Operating Instructions Manual page 63

Parameter
Request: Function Code
Start Address
Number of Registers
Response: Function Code
Start Address
Register Value
FC4 Read Input Register
With this command, any number (1-127) of input registers is read out. The start register, from which
the readout should start, and the number of registers are transmitted.
Parameter
Request: Function Code
Start Address
Number of Registers
Response: Function Code
Start Address
Register Value
FC6 Write Single Register
This function code is used to write to a single Holding Register.
Parameter
Request: Function Code
Start Address
Number of Registers
Response: Function Code
Start Address
Register Value
FC8 Diagnostics
With this function code different diagnostic functions are triggered or diagnostic values read out.
Parameter
Request: Function Code
Sub Function Code
Data
VEGABAR 86 • Modbus and Levelmaster protocol
Length Code/Data
1 Byte 0x03
2 Bytes 0x0000 to 0xFFFF
2 Bytes 1 to 127 (0x7D)
1 Byte 0x03
2 Bytes 2*N
N*2 Bytes Data
Length Code/Data
1 Byte 0x04
2 Bytes 0x0000 to 0xFFFF
N*2 Bytes 1 to 127 (0x7D)
1 Byte 0x04
2 Bytes 2*N
N*2 Bytes Data
Length Code/Data
1 Byte 0x06
2 Bytes 0x0000 to 0xFFFF
2 Bytes Data
1 Byte 0x04
2 Bytes 2*N
2 Bytes Data
Length Code/Data
1 Byte 0x08
2 Bytes
N*2 Bytes Data
10 Supplement
63