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LTC 8555 Series | Instruction Manual | Installation
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17
Bosch Security Systems | 29 August 2003
The modem on the Allegiant side must be set to an auto answer mode, and the modem on the keyboard side must be
set to an originate mode. In some cases, modem settings are configured via dipswitches found on the back of the
modem. In other cases, the modem must be connected to a PC for configuration. The below settings represent the
dipswitch configuration required for US Robotics Sportster modems.
5.3.5 Console Expander Configuration When Using RS-232 Model Keyboards
RS-232 model keyboards may be connected to an Allegiant system using the LTC 8712 Series Console Port
Expander, as shown in Figure 8. An LTC 8712 Series Console Port Expander can be configured to support up to four
RS-232 Keyboard connections. Other devices, such as a PC running the Allegiant Master Control software, can be
connected to the unused ports of the Port Expander. Because the Port Expander supports only a single baud rate for
the external connections, and the RS-232 keyboards require 9600 baud, all external devices connecting to the Port
Expander must be configured to for operation at this setting.
Figure 8: Configuration using LTC 8712 Series Console Port Expander
On Allegiant systems with a Printer port, up to two Console Port Expanders can be connected, supporting a total of
eight RS-232 model keyboards.
To configure an Allegiant system to operate with an LTC 8712 Console Port Expander, you must have access to the
Allegiant CPU’s dipswitches, the PC-based LTC 8059 Master Control Software, and possibly an Allegiant keyboard.
LTC 8712 Expander
Allegiant system main
CPU bay
Refer to text regarding setup of the Allegiant
& LTC 8712 to operate in Allegiant Keyboard
mode.
Junction box & power
adapter supplied with
LTC 8557 kit
User-supplied female
9-pin D connector.
3 m (10 ft) data/
power cable
supplied with
keyboard
User-supplied cable or other link
suitable for
full duplex RS-232 transmissions
at 9600 baud
Expander pin 2 (Rx) to Tx of link or directly to pin 3 of LTC 8557 box.
Expander pin 3 (Tx) to Rx of link or directly to pin 2 of LTC 8557 box.
Expander pin 7 (Gnd) to Data Gnd of link or directly to pin 1 of LTC 8557 box.
1
234
Allegiant side Modem Keyboard side Modem
Dip Switch Setting Modem Function Dip Switch Setting
1DOWNDTR Override 1 DOWN
2UPVerbal Result Codes 2 UP
3DOWN Display Result Codes 3 DOWN
4UPEcho Offline Commands 4 UP
5DOWN Suppress Auto Answer 5 UP
6DOWNCarrier Detect Override 6 UP
7DOWN Load Factory Defaults 7 DOWN
8DOWN Smart Mode 8 DOWN