ModBus and USB Serial Terminal Instructions for Thermal Flow Meters


 The Tactical Flow Meter uses the Modbus RTU Communication protocol. To enjoy the highest level of resolution many values are transmitted as CDAB Longs, that by default, according to the ModBus RTU protocol. These CDAB Longs carry a 10,000 multiplier to provide FOUR digits of precision. To parse the reading from the flow meter the user need only divide the returned Long CDAB value by 10,000.  We also provide some variables in the CDAB Float that are in the IEEE 752 format. These are used in emulation modes for various manufacturers.

Factory Tactical Flow Meter ModBus COM Setup:

BAUD 19200
Data Bits: 8
Parity: Even
Stop Bits: 1
Termination Character: NONE


Note: Zero Suppression provides the user with the ability to suppress readings from the flow meter, however we will not suppress the Sensor RAW value from your being able to read it. The suppression is handy for suppressing low value totalizing events and low end control system anomalies.

Configuration Registers:

These registers are from one single sample and are for reference.


You may wish to skip getting ModBus Pro in favor of using the simnple program shown above. It is very simple and is only provided as a test tool to assist you in using the ModBus protocol and learning how to parse out the data. The Tactical Flow Meter has constants in the form of an I32 Integer, a IEEE 754 Single Float from 4 bytes and a string. Read more


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