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11
Wiring Instructions
3.0 Wiring Instructions
3.1 RS-485 Wiring
The RS-485 wiring to the
RAX-LCD-LITE Module is
recommended to be twisted
shielded pair as shown in the
diagram. The wire needs to
conform to:
• 300mA power limited
• 22 AWG maximum of
2000 feet
• 20 AWG maximum of
4000 feet
• 18 AWG maximum of
8000 feet
• Maximum 40 ohm loop
resistance
The RS-485 wiring from the
fire alarm control panel to the
annunciator(s) must be point-
to-point from the fire alarm
panel to the first annunciator, then to the next annunciator, and so on. No star wiring or T-
tapping is allowed. Each RAX-LCD-LITE Annunciator Module has a 120 ohm end-of-line
resistor on JW6. The End-of-Line (EOL) jumper on JW6 should be installed on the right 2 pins
on the last wired module. Otherwise it should remain on the left two pins or can be removed.
3.2 24V DC Power Wiring
The 24 VDC field wiring needs to be of an appropriate gauge for the number of annunciators and the total
wiring run length. Use Section 5.2 Current Drain for Battery Calculations to calculate the maximum
current for all annunciators summed together
.
Note: All circuits are power limited, supervised and must use type FPL, FPLR, or FPLP
power limited cable.
Attention: Accidentally connecting any of the 24 VDC wires to the RS-485 wiring
will result in damage to the annunciator and/or to the fire alarm control
panel to which it is connected.
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S
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Figure 3 Wiring Diagram
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