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4 modbus rtu commands, Fc3 read holding register – VEGA VEGAFLEX 83 Modbus and Levelmaster protocol PFA insulated User Manual

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77

11 Supplement

VEGAFLEX 83 • Modbus and Levelmaster protocol

41838-EN-130314

Register Name

Register Number

Type

Note

TV

2106

DWord

Third Variable in Byte Order ABCD DCBA (Little En-

dian)

QV

2108

DWord

Quarternary Variable in Byte Order DCBA (Little En-

dian)

Status

2200

DWord

See Register 100

PV

2202

DWord

Primary Variable in Byte Order BACD (Middle Endian)

SV

2204

DWord

Secondary Variable in Byte Order BACD (Middle En-

dian)

TV

2206

DWord

Third Variable in Byte Order BACD (Middle Endian)

QV

2208

DWord

Quarternary Variable in Byte Order BACD (Middle En-

dian)

Unit Codes for Register 104, 108, 112, 116

Unit Code

Measurement Unit

32

Degree Celsius

33

Degree Fahrenheit

40

US Gallon

41

Liters

42

Imperial Gallons

43

Cubic Meters

44

Feet

45

Meters

46

Barrels

47

Inches

48

Centimeters

49

Millimeters

111

Cubic Yards

112

Cubic Feet

113

Cubic Inches

11.4 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