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Document 15342 Rev D1 07/24/97 P/N 15342:D1
Multiple Annunciator Wiring
• Do not "T-Tap" the power-limited EIA-485 circuit. It will not function properly. Wire as
shown below.
• Leave the 120 ohm resistor installed across the EIA-485 Out terminals at the last
annunciator on the circuit (see below). Remove this resistor from all other annuncia-
tors.
• Connect Earth Ground to a mounting screw on the backbox or cabinet.
• Connect 24 VDC Power to the annunciator. This power must be power-limited but need
not be supervised by a power supervision relay since it is inherently supervised by the
control panel (loss of communications is registered during loss of power to the
annunciator).
TB2
TB2
Control
Panel
EIA-485 (+)
EIA-485 (-)
ELR
Part #
71244
Figure 3-3: Wiring Multiple Annunciators (6,000 ft. max. run)
Last ACM-8R or other
annunciator-type device
First ACM-8R or other
annunciator-type device
4 (-)
3 (-)
2 (+)
1 (+)
4 (-)
3 (-)
2 (+)
1 (+)
Supervised and power-limited
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