Specifications

DS7400Xi Ver. 3+ Reference Guide Copyright © 1995-96 Detection Systems, Inc. Page 8
WARNING: Before servicing, remove
all power including the transformer,
battery and phone line. A complete
functional test is required after any
programming.
CAUTION: Incorrect connections may
result in damage to the unit.
NO
Typical burglar
alarm loop wiring
Z– L+
Typical 2-wire
smoke detector
wiring
Z– L+
Alarm
Power
++
–
Loop +
or PO2
Zone
Input
Aux. Power (—)
(terminal 5 or 7)
–
Alarm
Power
++
–
Typical 4-wire smoke
detector wiring.
For example:
Detection Systems’
DS250 in an MB4W base.
End-of-Line
Supervision Relay
(e.g. Detection Systems’
EOL200)
Z– L+
Loop +Zone
Input
Loop +Zone
Input
in out
in out
NC
EARTH GROUND: Must be connected to
a good earth ground such as a cold water
pipe and also connected to the cabinet cover,
using the supplied wire jumper.
ALARM OUTPUT:
Provides 12 VDC, special application, up to
1.75 A for powering bells, siren drivers, etc.
Function programmed in address 0146.
A/C INPUT: Use U. L. listed, 18 VAC 50
VA, class 2 transformer. Model TR-1850
requires 50/60 Hz. unswitched dedicated
outlet - do not share.
1
2
3
4
5
6
7
8
A
C
–
A
–
+
AUXILIARY POWER:
Provides 12 VDC, special application, up to
1.0 A for powering detectors.
OPTION BUS:
Used for options such as the ARDIS
communications module, the DS7420i Dual
Phone Line module, etc.
Also for keypads #11 - #15.
For Commercial Fire Mode: Option Bus wiring
should be in conduit if run ouside the
enclosure.
O
P
T
I
O
N
R
B
G
Y
A/C Power Indication LED
TYPICAL BURGLAR AND FIRE WIRING
Note: Shared cable is not recommended for
keypad, multiplex, options bus, telephone, or siren wiring.
ZONES 1-8: Zones 1-8 are intended for connection of Normally
Open or Normally Closed alarm contacts. They may also be used
for compatible 2-wire smoke detectors. These zones require a
2.21KΩ resistor (P/N 25899) at the end of the loop. Power is
momentarily removed from L+ after a [PIN] + [System Reset] or
during a fire verification.
Zone 1-8 assignments are programmed in address 0018-0025.
17 18 19 20 21 22 23 24 25 26 27 28 29 30
PO1 PO2
1–
L+
2– 3– 5– 6– 7– 8–4–
L+ L+ L+
PROGRAMMABLE OUTPUTS:
PO1 shorts to aux. power negative when activated, PO1 can sink up to 1.0 A.
PO1 function programmed in address 0147.
PO2 supplies 12 V and up to 500 mA when activated.
PO2 function programmed in address 0148.
KEYPAD BUS*:
Up to 15 keypads**
may be used. Can be
“home-run” or
“daisy-chained.”
9 10 11 12 13 14 15 16
RBGYGBSR
Keypad
(#1 - #10)
PHONE LINE:
* = Maximum wire length each: 1000 ft. (305 m).
Maximum wire length total in system: 6000 ft. (1830 m) when using
#22 AWG (0.8 mm) or #18 AWG (1.0 mm) cable.
** = Keypads #1 - #10 connect to the Keypad Bus and keypads #11 - #15
connect to the Option Bus.
(for a list of
compatible 2-wire
smoke detectors,
see Technical Service
Note P/N 27685)
System is Power Limited except for
battery terminals. All wiring entering
this enclosure must be power limited.
TTHRHR
Keypad
(#1 - #10)
3.0 Control Terminal Wiring