Apr 14, 2018 · To test the functionality of MODBUS RTU sensor TSH300 / TST300, without TCW210-TH controller, you will need a PC with WIN OS, USB to RS-485 converter, UTP cables, and 5VDC power supply. 1. Read carefully the user manual of the sensor. 2. Wire properly the sensor, power supply, USB to RS-485 converter and terminator (s).