16
ACS Manual —
P/N 15842:
N3
5/4/2022
Design Considerations
Cabinet Mounting of Annunciators
4.5 Cabinet Mounting of Annunciators
ACS modules must be mounted in special backboxes or in the CAB-3/4 series cabinets using a hinged dress panel such as ADP-4B, DP-
DISP, DP-DISP2, and ADP2-640:
•
ACM-16AT/ACM-32A in CAB-3 series cabinets
•
ACM-24AT, ACM-48A in CAB-4 series cabinets
See Section 3.5, “Cabinet & Panel Hardware”. For information on boosting the EIA-485 circuit signal or adding additional devices (not
addresses), see the
RPT-485W/RPT-485WF Installation Manual.
Annunciator
Fire Alarm
Control Panel
Two-wire
EIA-485 Circuit*
cab
a
3.
w
m
f,
ACM
-2
4
a
tfa
ce.wm
f
annunciator
expander
Expander
“Receive only” annunciator set to
address “X” and installed upstream.
Full Function “Receive/Transmit”
annunciator set to Address “X”
Figure 4.1 Supervising Receive Only Annunciators
NOTE:
A common reference connection must be made between multiple power supplies for the EIA-485 circuit to function properly. In the
AM2020/AFP1010, a common connection between the reference terminal of the SIB-2048A/SIB-NET EIA-485 interface and the reference
terminal (battery negative) of ACS power supplies must be made.
EIA-485 Reference
annunciators in a backbox,
powered from control panel
Fire Alarm
Control Panel
EIA-485 Circuit
ca
ba3
.w
m
f
annunciators in a cabinet,
powered from remote supply
two-wire EIA-485 circuit
Power Loop
A common reference connection
must be made between multiple
power supplies for the EIA-485
circuit to function properly!
A
C
M-
24
ATfa
ce.wm
f
Figure 4.2 Using Multiple Power Supplies With the EIA-485 Circuit