Fluid Components Intl ST51A - Modbus Engineering Units Codes Table; Modbus Device Status Code Table; Table 22 - Modbus Engineering Units Codes; Table 23 - Device Status Code Bit Assignments, Register #4025

OPERATION ST51A/ST75A/ST75AV Mass Flow Meters
64 Fluid Components International LLC
Modbus Engineering Units Codes Table
Table 22 – Modbus Engineering Units Codes
Units Type
Modbus Code
Unit Description
Temperature
32
degrees Celsius
33
degrees Fahrenheit
Volumetric Flow
123
Standard Cubic Feet per Minute (SCFM)
185
Standard Cubic Feet per Hour
182
Normal Cubic Meters per Minute
121
Normal Cubic Meters per Hour
175
Liter per Minute (LPM)
16
Gallons per Minute (GPM)
Mass Flow
82
Pounds per Hour (LB/H)
75
Kilograms per Hour (KG/H)
Velocity Flow
20
Standard Feet per Second (SFPS)
21
Standard Meters per Second (SMPS)
Totalizer
168
Standard Cubic Feet
166
Normal Cubic Meters
41
Liters
63
Pounds per Hour (LB/H)
61
Kilograms per Hour (KG/H)
40
Gallons
Modbus Device Status Code Table
Register #4025 is a 16-bit flag register that shows device status. A set bit (1) indicates a particular condition as listed in the table below.
Table 23 – Device Status Code Bit Assignments, Register #4025
Bit
Error/Status Description
0 (LSB)
Flow < Min Flow
1
Flow > Min Flow
2
Unused/Reserved
3
Flow > Customer Max Flow
4
Temperature < Customer Min Temperature
5
Temperature > Customer Max Temperature
6
Unused/Reserved
7
tcDelta_r < dr_min
8
tcDelta_r > dr_max
9
Unused/Reserved
10
Unused/Reserved
11
Unused/Reserved
12
Unused/Reserved
13
Unused/Reserved
14
Unused/Reserved
15 (MSB)
Delta_r > drNamur_max OR Delta_r < drNamur_min