Installation guide

5. Cabling: Test Access SIM
8820-A2-GN20-80 November 2004
5-5
3. Plug the other end of the cable into your modem’s serial port using a DB25
adapter and a Null Modem.
Connecting the Alarm In Port to an External Alarm
The following procedure is optional. Follow this procedure if you want to connect a
device that can close a contact upon failure to the BAC’s alarm system. This might
be used to provide an alarm in the event of:
 Open door or close door detection at remote locations
 External fan failures
 External power failures in a Remote Terminal (RT)
See Alarm In Connector in Appendix A, Pinouts.
Procedure
To connect a device to the 8820 BAC’s Alarm IN port:
1. Plug an 8-pin modular cable into the Alarm IN port.
2. Dress the cable to the right in the cable tray.
3. Connect the other end of the cable to the device providing an alarm output.
CLOCK
A
MCP
SERIAL
ALARM
IN
MCP
LAN
HUB-1
LAN
TAP
IN
SCP
SERIAL
ALARM
OUT
CLOCK
B
HUB-2
LAN
TAP
OUT
SCP
LAN
04-17558
SCP
SERIAL
Dial-up
Modem
DB25
Adapter
Null
Modem
ALARM
IN
04-17556
CLOCK
A
MCP
SERIAL
ALARM
IN
MCP
LAN
HUB-1
LAN
TAP
IN
SCP
SERIAL
ALARM
OUT
CLOCK
B
HUB-2
LAN
TAP
OUT
SCP
LAN