Why is the Twido RS485 limited to a maximum of 200 meters?



The RS485 standard says that the bus max length depends of the wire quality and cable capabilities and can go up to about 1000 to 1500 meters. The Twido RS485 port is certified only for 200 meter maximum length because the RS485 is non-isolated. If you use the TWDXCAISO in order to isolate the RS485 line the maximum length of the Network with the TWDXCAISO is 1000 meters.

Note: The Twido product line was obsoleted  Dec. 2015 and was replaced with the M221 line.