Concord 4 Series Systems 12
Figure 7. Connecting N/C and N/O Intrusion Detection and Motion Detector Circuits to the Panel
Connecting 2-Wire Smoke Detectors
Zone input 8 can be set up (in program mode) to accept the following 12 VDC, 2-wire smoke
detectors:
• System Sensor models 2400, 2400TH
• ESL models 429AT, 521B, 521BXT—(models 521B and 521BXT require the following dip
switch settings: 1-on, 2-off)
When set up for 2-wire smoke detectors, zone 8 can handle up to 20 smoke detectors (all of the
same model, as listed above) with 120 uA maximum idle current per detector. Maximum total
loop current allowed in an alarm condition is 90 mA. Connect one or more, 2-wire smoke detec-
tors to the panel as shown in Figure 8.
Note
The Two-Wire Smoke set-
ting (in program mode) must
be on when using 4-wire
smoke detectors as shown
in Figure 8. See
ONBOARD
OPTIONS—INPUTS in the sec-
tion “Programming the
Panel” for complete details.
Figure 8. Connecting 2 and 4-Wire Smoke Detectors to the Panel
Panel Terminals
2k Ohm EOL
Resistor 49-454
1 3
1 4 1 5 1 6 1 7
G N D
Z O N E 1 Z O N E 3
Z O N E 2
G N D
2k Ohm EOL
Resistor 49-454
Normally
Closed
(N/C)
Contacts
In Series
Normally
Open (N/O)
Contacts in
Parallel
L P
-
+
L N
1 9 2 0
G N D
Z O N E 5
1 1
+ 1 2 V
Motion
Detector
2k Ohm EOL Resistor 49-454
(Locate at Sensor)
Use only the 2-wire smoke detector models described above. Alarm signals from other
detectors may not be processed correctly if the panel has lost AC power and is operating
only from the backup battery.
Caution
!
2k Ohm EOL
(Locate at Last Detector)
Resistor 49-454
2-Wire
4-Wire
2 2
G N D
2 3
2 4
Z O N E 7
2 W S M K
Z O N E 8
+
C
O
M
. . . . . . . .
+
- -
C
O
M
N
O
N
O
+
C
O
M
. . . . . . . .
+
-
-
C
O
M
N
O
N
O
2 2
G N D
2 3
2 4
Z O N E 7
2 W S M K
Z O N E 8
+
-
+
-
Model
449AT
2k Ohm EOL
(Locate at Last Detector)
Resistor 49-454
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