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The larger Allegiant models support Keyboard Expander accessory units. These accessory units are used with
LTC 8557 Series Remote Hookup Kit, to provide additional keyboard connections to the system, as shown in
FIGURE 5.
Figure 5: Configuration using LTC 8714 Keyboard Expander unit (Refer also to Instructions supplied with LTC 8714
Keyboard Expander)
LTC 8555 Series | Instruction Manual | Installation
EN
|
13
Bosch Security Systems | 29 August 2003
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, dial-up modem, 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.
Large model Allegiant
system main CPU bay
Standard Allegiant Keyboard Ports 1 to 8
Up to 8
Keyboards
LTC 8714 Port
Expander
Up to 8 Keyboards per
Expander
Junction box and
3 m (10 ft) cable supplied
with LTC 8557 kit
Junction box and
power adapter
supplied with
LTC 8557 kit
3 m (10 ft) data/
power cable supplied
with keyboard
Up to 1.5 km (5000 ft) of
user- supplied shielded
twisted pair cable
(Belden 9841 or equivalent)
Keyboard Connection Type Keyboard Number
Direct to Console port 1
Direct to Printer port 5
Port 1 of Expander, when
Expander is connected to Console port 1
Port 2 of Expander, when
Expander is connected to Console port 2
Port 3 of Expander, when
Expander is connected to Console port 3
Port 4 of Expander, when
Expander is connected to Console port 4
Port 1 of Expander, when
Expander is connected to Printer port 5
Port 2 of Expander, when
Expander is connected to Printer port 6
Port 3 of Expander, when
Expander is connected to Printer port 7
Port 4 of Expander, when
Expander is connected to Printer port 8