Installation guide

6. Comm LED: displays a solid green when the RAD detects two things—the communication pair of wires

and that communication is established between the HAL and RAD. The light displays solid red if the

RAD cannot communicate with the HAL. This is likely due to a problem with the communications pair

of wires.

7. Audio Rx LED: displays solid green when the RAD detects that the pair of wires for receiving audio is

functioning properly, regardless of the RAD model. Displays red if there is a problem.

8. Audio Tx LED: displays solid green if communication with the HAL has been established and the HAL

informs the RAD of the Tx Audio lock. Displays solid red if there is a problem communicating with the

RAD or if there is a problem with the Audio Tx pair of wires.

9. Light sensor: detects the amount of light in the room and dims or brightens all LEDs appropriately—pri-

marily to prevent the LEDs from glowing in a darkened room like cat eyes on Halloween. Note that you

cannot turn these LEDs off manually. This is by design. We wanted to avoid the possibility of someone

erroneously thinking the RAD is defective (because the power light is off) and attempting to replace it

unnecessarily.

10. Locate mode: The Halogen software application contains a feature allowing you to verify the physical

location of a specific RAD or HAL device. When you place a RAD in Locate mode, the Power, Comm,

Audio Tx, and Audio Rx LEDs on the front of the corresponding RAD flash green. The flashing con-

tinues until you cancel the request in the software, place another RAD in Locate mode, interrupt the con-

nection between the computer and the HAL, disconnect the RAD, or power cycle the HAL. Mismatch

mode: When a RAD is connected to a RAD port on the back of a HAL, a comparison is made between

the physical RAD model and the RAD model specified for this port in the HAL configuration. If there is

a mismatch the Power, Comm, Audio Tx, and Audio Rx LEDs on the front of the corresponding RAD

flash red.

Following is an illustration of the back and side of a typical RAD:

HAL SYSTEM DESIGN GUIDE