Installation and Programming Instructions for the Serial Interface Module
7
Serial Interface Module
Federal Signal
www.fedsig.com
Steady Burn Red
When the light bar is equipped with a STEADY BURN RED LED module, applying 12 Vdc to the control lead
causes that module to operate when any mode input is selected.
Front Cutoff
12 Vdc applied to the FRONT CUT OFF control lead deactivates the selected MODE operation to the front of
the light bar. Only the rear lights will function. Additionally, with FLASH TAKEDOWN/ALLEY active, only the
alley lights flash. See “Programming Front/Rear Cut Off” on page 4.
Rear Cutoff
12 Vdc applied to the REAR CUT OFF control lead deactivates the selected MODE operation on the rear of
the light bar. Only the front lights function. See “Programming Front/Rear Cut Off” on page 4.
Intersection
Mode 1, 2, or 3 needs to be active to initiate the INTERSECTION feature. The factory setting activates the
INTERSECTION Mode when 12 Vdc is applied to the control lead for INTERSECTION. When 12 Vdc is removed,
the light bar returns to the original mode of operation. Additional programming for alternative configurations of
this feature are described in the sections “Programming the Intersection Function” on page 5.
Flash Takedown Alley
Applying 12 Vdc to the FLASH TAKEDOWN/ALLEY control lead flashes the ALLEY lights and TAKEDOWN
lights. MODE 1, 2, or 3 must be in operation for the FLASH TAKEDOWN/ALLEY feature to function.
Alley Lights
Applying 12 Vdc to the LEFT or RIGHT ALLEY control leads activates the corresponding alley light.
Takedown
Applying 12 Vdc to the Takedown control lead illuminates the TAKEDOWN lights. TAKEDOWN overrides the
FLASH TAKEDOWN/ALLEY and FRONT CUTOFF modes of operation.
Low Power
LOW LIGHT HAZARD: Enabling the Low Power function in the light bar may cause the light output
to fall below certain current light output standards and guidelines for emergency warning lights.
Use extreme caution when using this function. Ensure that the ambient light conditions are low
enough that you are seen and that the reduction of glare from the light bar is safer than full light
output in the situation. Failure to heed this warning may result in serious injury or death to you or
others in your vicinity.
LOW POWER mode is disabled when the light bar is in MODE 3 or INTERSECTION Mode.
Applying 12 Vdc to the control lead for LOW POWER mode dims the LEDs to 25 percent of their full
brightness. LOW POWER mode is functional only in MODE 1 or MODE 2 operation. LOW POWER is disabled
when switching to another mode of operation, including INTERSECTION mode.
To enter LOW POWER mode again, disconnect 12 Vdc from the lead for LOW POWER Mode and reapply
12 Vdc to the lead for LOW POWER Mode after a mode change occurs.
Under dark conditions, a light bar with an ambient light sensor automatically dims. Under bright conditions,
the light bar returns to full brightness. If MODE 3 or INTERSECTION is activated, the light bar returns to full
brightness in the dark and dims when MODE 3 or INTERSECTION is deactactivated.
