Communications Options User’s Guide
15
Chapter 1. Modbus Communications
61
Path D Last Error
0
10s*
2 (16 bit Int)
62
Path E Velocity
0
m/s x 1000
10s
2 (16 bit Int)
63
Path E Sound Speed
0
m/s x 10
10s
2 (16 bit Int)
64
Path E% Readings in Error
0
10s
2 (16 bit Int)
65
Path E Last Error
0
10s*
2 (16 bit Int)
66
Path F Velocity
0
m/s x 1000
10s
2 (16 bit Int)
67
Path F Sound Speed
0
m/s x 10
10s
2 (16 bit Int)
68
Path F% Readings in Error
0
10s
2 (16 bit Int)
69
Path F Last Error
0
10s*
2 (16 bit Int)
70
Internal Update Rate
10
Hz
On Init.
2 (16 bit Int)
71
Sound Speed Low Limit
300
m/s
On Init.
2 (16 bit Int)
72
Sound Speed High Limit
500
m/s
On Init.
2 (16 bit Int)
73
Velocity High Limit
40
m/s
On Init.
2 (16 bit Int)
74
Velocity Low Limit
–40
m/s
On Init.
2 (16 bit Int)
75
Signal Strength High Limit
100
dB
On Init.
2 (16 bit Int)
76
Signal Strength Low Limit
20
dB
On Init.
2 (16 bit Int)
77
Amplitude High Limit
95
On Init.
2 (16 bit Int)
78
Amplitude Low Limit
35
On Init.
2 (16 bit Int)
79
Number in Average
32
On Init.
2 (16 bit Int)
80
Software Version
(2 ASCII)
On Init.
2 (16 bit Int)
81
Checksum
On Init.
2 (16 bit Int)
82
Number of Paths
4
On Init.
2 (16 bit Int)
83
Modbus Address
32
On Init.
2 (16 bit Int)
*
The complete floating point value is constructed by combining readings from the first register with
a second register. An eight Hex digits number will represent the IEEE-754 hexadecimal floating point
value. 32-bit Hexadecimal Representation To Decimal Floating-Point conversion can be performed
if needed.
Example: Reg 1 reading is 44d7, Reg 2 reading is 4000, Actual Volumetric Flow is 44d74000, which
corresponds to 1722.
**The complete double precision floating point value is constructed by combining readings from all four registers
according to IEEE-754 for double precision.
Table 6: MODBUS Registers for a Sentinel Flowmeter
MODBUS Reg #
Description
Default
Unit
Refresh
Size in Bytes
