Connections - Bosch LTC 8714 Instruction Manual

LTC 8714 and 8715 Series | Instruction Manual | Installation

4.5 Connections

4.5.1 Expanding up to Eight Keyboards Using the
LTC 8714 Series Keyboard Port Expander
1. Make sure power is turned OFF on the
Allegiant Series main bay and the LTC 8714
Series Keyboard Port Expander. Make sure that
the external power supply used to power the
Allegiant Series keyboards is not connected to
a wall outlet.
2. For each keyboard used with the LTC 8714
Series, one LTC 8557 kit is required. The
LTC 8557 kit consists of two junction boxes,
a power supply, a barrel plug cord, and a
3 meter (10 ft) keyboard cable.
3. Connect the 3m (10ft) cable supplied with the
keyboard between the keyboard and the remote
junction box.
4. Up to 1.5km (5000ft) of customer supplied
2
0.5mm (24AWG) shielded twisted pair (Belden
9841 or equivalent) may be run between the
two junction boxes. Connection to the junction
boxes are made to three of the four screw
terminals as follows. Note reversal to data
connections.
Terminal Remote
Number Keyboard
Junction Box
1 Spare
2 +
3 –
4 Shield
5. Connect the 3m (10ft) cable supplied
with the LTC 8557 kit between the junction
box and the PORT connector on the LTC 8714
Keyboard port expander. Connect the power
supply to the junction box at the remote
keyboard site. Verify that the junction box
power LED indicator lights. Also verify that the
keyboard LEDs are flashing.
Bosch Security Systems | May 23, 2005
4.5.2 Expanding Beyond Eight Keyboards Using
In order to expand beyond eight keyboards, the use
of an LTC 8715 Series unit in conjunction with an
LTC 8714 Series unit is required. Using multiple
LTC 8715 units, the remote keyboards can be
expanded to 120. Note that the maximum number
of keyboards may be limited by the Allegiant system.
See FIGURE 10.
Local
Junction Box
Spare
–
+
Shield
6. Similarly, repeat Step 5 for each Allegiant Series
keyboard.
7. Using the cable supplied with the LTC 8714
Series Keyboard Port Expander, connect one
end of the cable to the connector marked
SYSTEM on the LTC 8714 Series unit. Connect
the other end of the cable to the connector
marked COMM2 on the Allegiant Series system
(see FIGURE 9).
the LTC 8714 Series Keyboard Port Expanders
with the LTC 8715 Series Expander
1. Follow Steps 1 through 7 in the previous section
for connecting up to eight keyboards using the
LTC 8714 Series unit.
2. Select the appropriate group number on the
LTC 8714 Series unit via dip switch S402,
switches 2 through 5. The group number must
be unique and must not conflict with other
LTC 8714 units or the local keyboards (i.e.,
keyboards connected directly to the ports
located on the main CPU bay) in the Allegiant
system.
3. Using the cables supplied with the LTC 8714,
connect the SYSTEM port on the LTC 8714 to
any one of the four PORTS on the LTC 8715
unit. Repeat steps 1 and 2 for all LTC 8714
Series units.
4. Using the cable supplied with the LTC 8715 unit,
connect the SYSTEM port on the LTC 8715
Series unit to the COMM2 port on the Allegiant
Series main bay. In this configuration, up to
32 remote keyboards can be connected using
four LTC 8714 units and one LTC 8715 unit. To
expand beyond 32 remote keyboards, another
tier of LTC 8715 units may be used (see
FIGURE 11).
EN | 9