61
10 Supplement
VEGABAR 87 • Modbus and Levelmaster protocol
46297-EN-220624
Unit Code
Measurement Unit
2
in Hg
3
ft H2O
4
mm H2O
5
mm Hg
6
psi
7
bar
8
mbar
11
Pa
12
kPa
13
torr
32
°C
33
°F
40
US liq. gal.
41
L
42
Imp. Gal.
43
m3
44
ft
45
m
46
bbl
47
in
48
cm
49
mm
111
cyd
112
cft
113
cuin
237
MPa
10.4 Modbus RTU commands
FC3 Read Holding Register
With this command, any number (1-127) of holding registers is read out. The start register, from
which the readout should start, and the number of registers are transmitted.
Parameter
Length
Code/Data
Request:
Function Code
1 Byte
0x03
Start Address
2 Bytes
0x0000 to 0xFFFF
Number of Registers
2 Bytes
1 to 127 (0x7D)
