Encrypted Module Network

The Protege system incorporates encrypted RS-485 communications technology. Always connect the NA and NB terminals of the controller to the NA and NB terminals of the expansion devices and keypads. The N+ and N- must connect to a 12V power supply source capable of supplying the peak current drawn by all modules.

• If a shielded cable is used, the shield must be connected at only one end of the cable.

  Ideally this is to the cabinet ground, mains supply earth or copper pipe. Do not connect a shield at both ends.

• Do not connect the shield to a V- connection on the Controller
• Do not join the shield and black wires at the reading device
• Do not connect the shield to any shield used for isolated communication