How to determine which RS422/RS485 RJ45 port is port 1 on the back of the DX8100 Series Hybrid Video Recorder.
Pelco Video Management
DX8100 Series hybrid video recorder (HVR)
Which port is port 1, 2, 3,4 for PTZ control or attaching a KBD300A.
On the RS422/RS485 card, port 1 is at the bottom and port 4 is at the top.