Hello Team,
We have connected 4 x SN65HVS885 in cascade mode. We read them successfully and correctly only when all of the RE (return) pins are connected to a common ground. Also, we needed to connect the free IPs to this common ground.
Since our project includes digital inputs from different field devices, we need a disctinct connection for every IP/RE couple. However, in that case, a logical level "1" is randomly generated on some of the free input pins (IPs).
So, my question is, how is it possible to have the SN65HVS885 work correctly without using a common ground? Instead, each input field pair should use its own IP-RE couple.
Kind regards,
Varban