Openpath Readers and ACUs communicate via RS-485. The following wire types are compatible, listed in the order of preference which impacts distance.

• l Shielded CAT6A (recommended, additional two pairs can be used for sensors)

• l Shielded CAT6

• l Shielded RS485 w/22-24AWG (lower gauge, thicker wire is better)

• l Shielded CAT5

• l Unshielded CAT6 l Unshielded CAT5

• l Shielded 22/6

• l Unshielded 22/6

Ideally, use one twisted pair for GND and VIN (power) and one twisted pair for +B and -A (data).

Wiring Information

Recommended maximum cable length: 300 ft (91 m) with CAT6 or 500 ft (152 m) if two wire pairs are used for GND and VIN (power).

For shielded wiring: Connect one side of the drain wire (the shield around the wires) to the GND terminal on the ACU. Both the shield and the GND wire can share the same GND terminal. Do not connect the other side of the shield to anything.

For standard reader installation: We recommend that you install a 1-Gang 20 CU box in order to flush-mount the reader. Alternatively, the reader may also be surface mounted with the included back plate.

Note: For elevators, all relays and readers must be connected to the same ACU. If you need more than four access-controlled floors or readers, add the Openpath Elevator Expansion Module.