Wiring The Serial Interface Module; Figure 5 Wiring Block Diagram - Federal Signal Corporation Legend LGD Installation, Operation And Service Manual

Wiring the Serial Interface Module

For the wiring block diagram, see Figure 5.

Figure 5 Wiring block diagram

FUSE ELECTRICAL SOURCES: Always fuse current/voltage sources with
a fuse connected near the power source. Ensure that the fuse is properly
rated to protect the electrical load, the wiring, and the connectors used in
the circuit. Failure to follow this notice could result in vehicle or equipment
damage.
For typical installations with common controllers and switch boxes, see the wiring
schematics in the Appendix starting on page 52.
For wiring the controller's functions to the Serial Interface Module's 24-pin cable
harness, see Table 9 on page 20 and the figures on pages 32 though 34. If
additional wire is necessary for the harness (except ground), 22 AWG wire is
adequate. The ground wires must be extended with 16 AWG or better wire.
This section is an overview of default settings that are activated when connecting
LED and MODE control wires to 12 Vdc (+BAT). All programming and changes
to default settings should be done after bench testing the light bar and before
installation. Programming is covered in "Programming Priority MODES 1, 2, 3, and
INTERSECTION" on page 22. For a description of the control wires from the
Serial Interface Module, see Table 9 on page 20.
MODES 1, 2 , and 3
To activate a mode, apply 12 Vdc (+BAT) to a mode control wire. MODE 3 overrides
MODE 2, and MODE 2 overrides MODE 1. You can program one of the 26 flash
patterns in the light bar's library to each mode input.
STEADY BURN (LGD Models Only)
When the light bar is equipped with one or more STEADY BURN LED modules,
applying 12 Vdc (+BAT) to the STEADY BURN control wire (red/white) turns on the
LEDs when any MODE input is selected.
Installation, Operation, and Service Manual
Federal Signal www.fedsig.com
Wiring the Legend in the Vehicle
FUSE
16 AWG
SERIAL INTERFACE
MODULE
CAT5 CABLE
BLACK 10 AWG
RED 10 AWG
IGNITION
1 A
MAXI FUSE
40 A
- +
BATTERY
290A5977
29