Chamberlain SENTEX INFINITY Installation Instructions Manual page 10

DOOR POSITION SENSING
The system can monitor the position of two doors and take action
if the door is pried open or held open for more than a minute after
the relay deactivates.
• The system can call a telephone number and report this
condition and/or close a relay and activate any device you have
hooked to it.
• If the door shuts before the relay times out, the relay is
deactivated to stop "tailgating."
• To use this feature, install a NC (normally closed) switch in the
door frame so the switch is depressed when the door is closed.
• Wire the NC and COM switch terminals to "Status 2" and
"Common" on TB8 for door 1, and/or
• Wire the NC and COM switch terminals to "Status 4" and
"Common" on TB7 for door 2.
• If the door is located more than 25' from the unit, use shielded
cable and connect the shield to the ground screw shown on
page 8 or 9.
CONNECT A TERMINAL
The system works with any standard ASCII terminal that emulates
a Televideo 910+ terminal via RS232 serial port. Personal
computers with "terminal emulation" software may be used
instead of the actual terminal. Plug the terminal into RS232 Port 1.
• Use a 3-conductor, 18 to 24 AWG shielded cable. These
conductors should not be part of a larger cable that contains
wires used for other purposes.
• Use a "DB25" male connector ("DB9" if your computer has a
9-pin serial port), and ground the cable shield at the unit's
ground screw.
• Under most conditions, you can locate the terminal up to 50'
away from the system at any transmission baud rate. However, if
your installation is subject to excessive electrical noise, you may
need to use "short haul" modems to achieve this distance.
Contact the factory for more details if you think you need to use
these short haul modems.
Your terminal must be running at the same baud rate as the
system (see above), and must be set to full duplex
communications and a word protocol of 8 data bits, no parity bits,
and 1 stop bit (8-none-1). Consult your terminal's manual to
determine how to set this protocol. The connections for the video
terminal or computer are shown at right.
A D D I T I O N A L F E A T U R E S
Figure 5
10
DB9S CONNECTIONS
PIN NUMBER ON DB9S
Place one jumper between
pins 4 and 6 and another
between pins 7 and 8.
2 ("receive data")
5 ("signal ground")
3 ("transmit data")
DB9S
5
3
PIN #
2
DB9S
(Back View)
Jumper:
Pins 4 to 6
Pins 7 to 8
Use 18-24 AWG,
3-Conductor, Shielded Cable
Jumpers
(30 Feet Max. Length)
not shown
TERMINAL ON MAIN
CIRCUIT BOARD TB2
Place a jumper between
pins 1 ("cts") and 5 ("rts").
RS32 out ("out")
GROUND
RS232 in ("in")
Jumper
CTS to RTS
TB2
CTS
OUT
GND
IN
RTS
INFINITY
PROCESSOR
BOARD