Chillies

Hi guys, I have a problem I'm using a PTZ Camera through an encoder via RS485 Cable to gain control of the camera but not exactly sure how to connect the wiper in order for it to work as I use a Pelco KBD300A keyboard to control the camera. The wiper has a Thick Blue and Brown Cable, must a power supply be connected to the wiper wires itself or does it go straight to the RS485 Cable??? Thanks