How does the Rock use Wiegand and how would it know if access is granted or denied?

The Rock sits between the badge reader and the Access Control System (ACS) using the Wiegand protocol to communicate. The Rock monitors the Wiegand LED signal(s) from the ACS to learn if access was granted.

The Rock supports 1-Wire and 2-Wire modes for LED operation.

For 1-Wire LED, the orange wire is used.

For 2-Wire LED, both the orange and brown wires are used.