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Allegiant Keyboards
Allegiant system main
Figure 5.3 Typical Configuration using optional LTC 8557 Series Hookup Kit
Allegiant
Keyboard Port
Figure 5.4 Typical Configuration using fiber optic link
5.3
LTC 8555/02 and LTC 8555/03 (RS-232 Protocol Model)
Installation
5.3.1
General
The RS-232 protocol versions of the LTC 8555 Series keyboards can be connected to either an
Allegiant LTC 8712 Series Console Port Expander accessory unit, or the 9-pin Console or
Printer (if equipped) RS-232 port on the back of the Allegiant system. The keyboard may be
connected via hardwired cable or using another type of communication system conforming to
standard RS-232 transmission.
For each keyboard being installed, an LTC 8557 Series Remote Hookup Kit (sold separately),
user-supplied 9-pin mating connector, and user-supplied cable suitable for use with RS-232
signals is required. Refer to the most applicable configuration diagram.
5.3.2
Keyboard Number Assignments when Using RS-232 Model Keyboards
Use of RS-232 protocol keyboards does not increase the total number of keyboards that can
be connected to an Allegiant switcher. When an RS-232 keyboard is connected in the system,
a standard keyboard port will automatically become disabled. The disabled keyboard port
number will be based on the interface connection type of the RS-232 keyboard. Keeping track
of these keyboard numbers is necessary when priority-based restrictions, or other keyboard
related lockouts, are assigned and used in the system.
The table below indicates which keyboard number will be assigned, based on the connection
being used.
Bosch Security Systems, Inc.
CPU bay
user-supplied 0.5 mm
Junction box and 3 m (10 ft)
cable supplied with LTC 8557 kit
Allegiant system main
CPU bay
Fiber link
Junction box and 3 m (10 ft)
cable supplied with LTC 8557 kit
Instruction Manual
Up to 1.5 km (5000 ft) of
2
(24 AWG) shielded
twisted pair cable
(Belden 9841 or equivalent)
Power adapter supplied
with LTC 8557 kit
LTC 4600 Series, or other fiber optic
link designed for use with Allegiant
RS-485 protocol
4 km (2.5 miles)
typical distance
Fiber link
User-supplied shielded twisted pair
cable
(Belden 9841 or equivalent)
Installation | en
3 m (10 ft) data/
power cable
Junction box supplied
supplied with
with LTC 8557 kit
keyboard
3m (10 ft) data/
power cable
supplied with
keyboard
Junction box and power adapter
supplied with LTC 8557 kit
F.01U.127.290 | 2.0 | 2009.03
13
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