RS422 control on the FS85011
Pelco Cameras, Pelco Transmission & Power
Setup RS422 control
The FS85011 fiber series comes setup as RS422 from the factory (block seated on both pins). If the P3 jumper was moved to one pin it will need to be moved back to both pins connected.
See picture below
View the following article for: How to set the FS85011 fiber module for coaxitron protocol.