Chapter 1. Modbus Communications
14
Communications Options User’s Guide
Table 6: MODBUS Registers for a Sentinel Flowmeter
MODBUS Reg #
Description
Default
Unit
Refresh
Size in Bytes
1, 2*
Actual Volumetric Flow
0
am
3
/hr
1s
4 (IEEE 32 bit Float)
3, 4*
Soundspeed
0
m/s
1s
4 (IEEE 32 bit Float)
5
Measurement Status
0
1s
2 (16 bit Int)
6, 7*
Area Average Velocity
0
m/s
1s
4 (IEEE 32 bit Float)
8, 9*
Normal Volumetric Flow
0
sm
3
/hr
1s
4 (IEEE 32 bit Float)
10, 11, 12, 13**
Actual Volume Forward Total
0
am
3
2s
8 (64 bit double
precision)
14, 15, 16, 17**
Actual Volume Reverse Total
0
am
3
2s
8 (64 bit double
precision)
18, 19, 20, 21**
Normal Volume Forward Total
0
sm
3
2s
8 (64 bit double
precision)
22, 23, 24, 25** Normal Volume Reverse Total
0
sm
3
2s
8 (64 bit double
precision)
26, 27*
Mass Flow
0
kg/hr
2s*
4 (IEEE 32 bit Float)
28, 29*
Forward Mass Total
0
kg
2s*
4 (IEEE 32 bit Float)
30, 31*
Reverse Mass Total
0
kg
2s*
4 (IEEE 32 bit Float)
32, 33*
Energy Flow
0
J/hr
5s*
4 (IEEE 32 bit Float)
34, 35*
Forward Energy Total
0
J
5s*
4 (IEEE 32 bit Float)
36, 37*
Reverse Energy Total
0
J
5s*
4 (IEEE 32 bit Float)
38, 39*
Pressure
10
5
Pa
10s/Fixed
4 (IEEE 32 bit Float)
40, 41*
Temperature
20
C
10s/Fixed
4 (IEEE 32 bit Float)
42
Super Compressibility Factor x 1000
1000
10s/Fixed
2 (16 bit Int)
43
Density x 1000
1000
lb/ft
3
10s/Fixed
2 (16 bit Int)
44
Kinematic Viscosity x 10
8
1000
m
2
/s
10s/Fixed*
2 (16 bit Int)
45
Heating Value
25000
kJ/m
3
10s/Fixed*
2 (16 bit Int)
46
Path A Velocity
0
m/s x 1000
10s
2 (16 bit Int)
47
Path A Sound Speed
0
m/s x 10
10s
2 (16 bit Int)
48
Path A% Readings in Error
0
10s
2 (16 bit Int)
49
Path A Last Error
0
10s*
2 (16 bit Int)
50
Path B Velocity
0
m/s x 1000
10s
2 (16 bit Int)
51
Path B Sound Speed
0
m/s x 10
10s
2 (16 bit Int)
52
Path B% Readings in Error
0
10s
2 (16 bit Int)
53
Path B Last Error
0
10s*
2 (16 bit Int)
54
Path C Velocity
0
m/s x 1000
10s
2 (16 bit Int)
55
Path C Sound Speed
0
m/s x 10
10s
2 (16 bit Int)
56
Path C% Readings in Error
0
10s
2 (16 bit Int)
57
Path C Last Error
0
10s*
2 (16 bit Int)
58
Path D Velocity
0
m/s x 1000
10s
2 (16 bit Int)
59
Path D Sound Speed
0
m/s x 10
10s
2 (16 bit Int)
60
Path D% Readings in Error
0
10s
2 (16 bit Int)
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