Installation Guide
RECOMMENDED CONFIGURATION
Openpath readers and ACUs communicate via RS-485. The following wire types are compatible,
listed in the order of preference which impacts distance.
● Shielded CAT6A (recommended, additional two pairs can be used for sensors)
● Shielded CAT6
● Shielded RS485 w/22-24AWG (lower gauge, thicker wire is better)
● Shielded CAT5
● Unshielded CAT6
● Unshielded CAT5
● Shielded 22/6
● Unshielded 22/6
Ideally, use one twisted pair for GND and VIN (power) and one twisted pair for +B and -A (data).
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.
Version 1.5
©
Openpath 2019
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