LTC 8555 Series |
Instruction Manual
|
Installation
EN
| 16
Bosch Security Systems | 29 August 2003
5.3.4
Modem Interface Information When Using RS-232 Model Keyboards
RS-232 model keyboards can be connected to an Allegiant via dial-up modem link. The keyboard supports a
rudimentary ability to dial a phone number of an attached modem. Further details for the dial-up feature will follow,
in the operating instructions.
FIGURE 7 shows a typical system configuration using a modem connection.
Figure 7: Connection using Dial-up Modem Link
A modem interface requires the cable connections below. A user-supplied cable suitable for RS-232 communications
is required.
Allegiant system main
CPU bay
CONSOLE port on Allegiant
system must be configured
for
RS-232 Keyboard mode
Junction box and power
adapter supplied with
LTC 8557 kit
User-supplied
Allegiant-to-modem
interface cable
User-supplied dial-up
modem link
Modem
Modem
User-supplied
modem interface
cable
Allegiant System
Console Port 9-pin connector
Modem 25-pin connector
1 (Chassis Gnd)
1 (Chassis Gnd)
2 (Rx)
3 (Tx)
3 (Tx)
2 (Rx)
4 (CTS)
8 (DCD)
5 (RTS)
4 (RTS)
7 (Data Gnd)
7 (Data Gnd)
Tie pins 6 (DSR) &
20 (DTR) together
RS-232 Keyboard
Modem 25-pin connector
LTC 8557 Hookup Kit terminal
2
3
3
2
7
1
Tie pins 4 (RTS) &
8 (DCD) together
