IMPORTANT: Terminate the cable on the keypad first, then the KPT and then PX-700. This is the best way to avoid blowing the keypad fuse on the PX-700. (See Wiring Information for more details.) An ATC Touchscreen Controller installation requires both the ATC and one ATC RS-232 Interface Board per ATC with one exception as noted below under �Four Conductor Wiring.� 1. Install the ATC RS-232 Interface Board at the head end of the Installation (the equipment end). 2. Pull Cat 5 cable from the ATC location to the head end. 3. Terminate both ends of the Cat 5 cable with RJ-45 8 pin connectors (for short runs or programming on the bench, you may use standard Ethernet cable available at any computer supply store). It is critical that you pair the Cat 5 cable wires as follows and that both ends of the cable are wired identically: � Pins 1 and 2 (RXD + and -) � Pins 4 and 5 (RS-485 � [data 2] and + [data 1]) � Pins 3 and 6 (power and ground) � Pins 7 and 8 (TXD + and -) This pin number pattern is looking down at the flat side of the connector (not the side with the locking tab). Make sure the colored pairs are the same at both ends of the cable.
