
2-3 System Wiring
9
2-2.3 Mounting the Control Unit
1.
Position the unit on the mounting tabs located at
the top of the back cover. Refer to Figure 5.
WARNING: Ensure that AC Power is OFF when mount-
ing the unit to the back panel. If the header terminals
are inserted into the incorrect terminals on the termi-
nal block, permanent damage to the unit may result.
2.
Ensure that the two antennas are not obstructed,
bent or repositioned, the tamper switch spring fits
through the access hole to make contact with the
wall and that the header pins on the printed circuit
board are inserted into the correct terminals.
3.
Slide tabs on bottom of unit into the slots of the
back cover.
4.
Secure unit in place with the two screws provided.
2-3 System Wiring
The R, B, Y1, G2 terminals located on the inside of the
back cover, can be configured as a Keybus, or 2 hard-
wired zones or 2 PGMs (programmable outputs), or 1
PGM and 1 hardwired zone . If configured as a Keybus
or hardwired zone, wire devices using 22 AWG
stranded wire; maximum wire run distance must not
exceed 1000 ft. (305 m.).
Ratings: 9 V
AC
/ 20 VA / 50/60 Hz.
2-3.1 Keybus Wiring
The Keybus is used to communicate to other modules on
the system. In this configuration the ‘R’ terminal is
+6V
DC
, the B terminal is ground, Y1 terminal is the
CLOCK and the G2 terminal is the DATA. If the system is
configured for Keybus then Keybus Enabled (section
[018] option 1) must be ON. Hardwired zones 1 and 2,
and PGMs 1 and 2 will not be available. If an NT9204
module is connected to the system (via the Keybus) then
PGMs 11, 12, 13 and 14 will be available. Enter [00] in
section [030] when an NT9204 is used.
☞
The Keybus can not drive any module other
than the NT9204 directly. To connect to
LINKS2x50, an NT9204 module must be con-
nected to the Keybus.
Figure 5
Example of Keybus Wiring
Module A is wired correctly
(within 1000’/305m of the panel)
Module B is wired correctly
(within 1000’/305m of the panel)
Module C is NOT wired correctly
(greater than 1000’/305m from the
panel)
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