How to Configure Traffic Signal Flash Settings

Traffic signal flash configuration determines how a cabinet and controller assign flash outputs during remote flash operation. In a standard 332 cabinet, the CMU channels and remote flash channels are assigned in a specific way, and the remote flash setting must match the correct channel assignment to avoid a red fail after reboot.

During the All Red after Flash interval, the overlaps do not turn on. The CMU will give a red fail on any overlap channel during this condition.

In a standard 332 cabinet, the following channel assignments are used:

• AUX S1 = CMU Channel 9
• AUX S3 = PED 3 or NU
• AUX S4 = CMU Channel 11 / Remote Flash Channel 16 / OLC
• AUX S5 = CMU Channel 12 / Remote Flash Channel 17 / OLD

For CMU use, Channels 9–12 are used for overlaps, and Channels 13–16 are used for pedestrian channels.

For remote flash, use the channel assignment that matches the cabinet wiring and controller output assignment. A remote flash setting on Channel 17 is the correct setting to try for the cabinet configuration described here, rather than Channel 16.

A referenced remote flash setup was:

1. Channel 2: Flash 1, no Alt Flash 0
2. Channel 1 (Phase 1) / Channel 4 (Phase 3): Flash 1, Alt Flash 1

If remote flash is not setting properly, the system can show a red fail after reboot. The configuration should be checked against:

1. The controller output assignment information
2. The cabinet drawings
3. The correct remote flash channel assignment

If the cabinet is a standard 332 configuration, verify that the remote flash channel matches the cabinet hookup chart before testing again.