Fc4 read input register, Fc6 write single register – VEGA VEGABAR 83 Modbus and Levelmaster protocol - Operating Instructions User Manual

Page 71

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71

10 Supplement

VEGABAR 83 • Modbus and Levelmaster protocol

46295-EN-131107

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.
Request:

Parameter

Length

Code/Data

Function Code

1 Byte

0x06

Start Address

2 Bytes

0x0000 to 0xFFFF

Number of Registers

2 Bytes

Data

Response:

Parameter

Length

Code/Data

Function Code

1 Byte

0x04

Start Address

2 Bytes

2*N

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