UFM2/UBT User Manual
Page 30 Issue 1.1b July 20
4.3 Modbus (if fitted)
The Modbus RTU interface is configured via the Modbus sub menu.
• Float byte order –AB CD – Big endian – MSB first.
• The data rate can be selected in the range 1200 to 38400 baud.
• The address can be set in the range 1 to 126.
• Minimum Polling Rate 1000 ms (1 s). Time out after 5 seconds.
• The unit will only respond to Modbus requests while operational, while the flow reading, volume
total, energy total, power or temperature screens are displayed.
• If the flow reading is invalid then the flow value will be zero.
• If a UBT temperature sensor goes out of range then the value will go to 12.2°F (-11°C).
The above faults will set the relevant status bit (see page 38).
On a unit set to Imperial the temperature is in °F, Power is in BTUs and flow in US Gallons.
The UFM2/UBT complies with the Modbus specification document:
http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf
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