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How to connect PT-100 to Modbus RS485 converter


This small PT-100 to Modbus RS485 can be useful for connect some PT-100 temperature sensors.

We use a just read the Modbus converter register.

HMI screen in operation with 2 PT-100 sensors


PT-100 to RS485 DIN-Rail converter module

Working voltage: 8-25 VDC
Working current: 8-13 mA
Serial port baud rate: 9600 (default), N, 8, 1
Up to 247 modules. For 16 or more, we suggest to use a RS485 repeater
For 3 wires or 2 wires PT-100 sensor
Temperature range: -20 to +220 °C
Accuracy: 1%
Size: 60 X 30 X 16 mm

PT-100 wiring with 2 or 3 wires


RS485 and Power supply wiring


HMI project

With this HMI project, you can try quickly the solution : Download it!