A 0975AT Sensor Network Termination Cable should be used to connect the last sensor on the network to improve communication reliability.
RS485 best practice requires a termination resistor to be placed at each end of a network. The 0975AT cable has a built-in 120 Ω resistor. Another 120Ω termination resistor is supplied with the 0975AT cable, this should be installed at the RS485 Master end of the network.
- If there is only one sensor on the network, then an 0975AT cable should be used.
- Only one 0975AT cable should be used on a network.
- A 120Ω resistor must also be placed at the RS485 Master end of the network.
- All other sensors must remain unterminated using a 0975A Sensor Cable.
For further information, please refer to Hydronix Engineering Note: “EN0060 Sensor Cable Wiring Information (Hydronix Part no. 0975A and 0975AT)“.