
ST100A Series Flow Meter
OPERATION
Fluid Components International LLC
83
Modbus Exception Codes Table
below summarizes the possible Modbus exception codes for the ST100A Series.
Table 24 – ST100A Series Modbus Exception Codes
Code
Exception
Description
02
Illegal Data Address
The Data address received in the query is not an
allowable address for the master/slave
03
Illegal Data Value
A value contained in the query data field is not an
allowable value for master/slave
Modbus Variables and Registers Map Table
below summarizes the Modbus variables and registers for the ST100A Series.
Table 25 – ST100A Series Modbus Variables and Registers Map
Variables/Parameter
Modbus
Register
Data Type
Access
Flow MS (of float32 value)
4100
16 bit integer
Read
Flow LS (of float32 value)
4101
16 bit integer
Read
Temp. MS (of float32 value)
4102
16 bit integer
Read
Temp. LS (of float32 value)
4103
16 bit integer
Read
Totalizer1 MS (of float64 value)
4104
16 bit integer
Read
Totalizer1 LS (of float64 value)
4105
16 bit integer
Read
Totalizer2 MS (of float64 value)
4106
16 bit integer
Read
Totalizer2 LS (of float64 value)
4107
16 bit integer
Read
Pressure MS (of float32 value)
4108
16 bit integer
Read
Pressure LS (of float32 value)
4109
16 bit integer
Read
Totalizer Modulo MS (of float32 value)
4110
16 bit integer
Read
Totalizer Modulo LS (of float32 value)
4111
16 bit integer
Read
Totalizer Rollover MS (of float32 value)
4112
16 bit integer
Read
Totalizer Rollover LS (of float32 value)
4113
16 bit integer
Read
Reset Totalizer (input “ABCD” hex)
4116
16 bit integer
Write
Enable/Disable Totalizer (1 = Enable, 0= Disable)
4117
16 bit integer
Read/Write
Flow Unit
4119
16 bit integer
Read
Temperature Unit
4120
16 bit integer
Read
Totalizer Unit
4121
16 bit integer
Read
Pressure Unit
4122
16 bit integer
Read
Status Code 1
4124
16 bit integer
Read
Status Code 2
4125
16 bit integer
Read
Status Code 3
4126
16 bit integer
Read
Flow value
5101
Float32
Read
Temperature value
5102
Float32
Read
Totalizer MS (of float64 value)
5103
Float32
Read
Totalizer LS (of float64 value)
5104
Float32
Read
Pressure value
5105
Float32
Read
Summary of Contents for ST100A Series
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