Chamberlain Sentex INFINITY Installation Instructions Manual page 15

The Infinity system has many standard features which can be
connected during installation. Only card readers, built-in modems
and CCTV cameras must be ordered as options.
NOTE: It is critical to proper system operation that the specified
cable types and grounding procedures be used. If not, outside
electrical interference (i.e., nearby power and control cables or
radio station broadcast towers) may cause erratic card or keypad
readings, system resetting, or lock-up.
POSTAL LOCK INSTALLATION
If mail boxes are inside a controlled area, the post office requires
their own lock be installed.
• A postal lock kit is provided with each system, which includes
installation instructions.
• When the kit is installed, a postal carrier turning a key in the
lock will activate the relay for a programmable period of time.
• A record of this activity will be stored in the transaction
memory buffer, and printed if this system is equipped with
a printer.
AUXILIARY OPENING/REQUEST ACCESS DEVICES
Any contact closure device (i.e. Knox box or exit button) can be
wired to relays 1 and/or 2.
• To activate relay 1, connect the device to "Status 1" and
"Common" on TB8.
• To activate relay 2, connect, "Status 3" and "Common" on
TB7.
• Use shielded cable and connect the shield to the ground screw
(Figure 6 and Figure 7).
• When a contact closure occurs, the system will activate the
appropriate relay for a programmable period of time. A record
of this activity will be stored in the transaction memory buffer,
and printed if this system is equipped with a printer.
I N S T A L L I N G A D D I T I O N A L F E A T U R E S
BEFORE hooking up ANY of these features, DISCONNECT
power from the unit.
DOOR POSITION SENSING
Each Infinity 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 to report this
condition and/or close a relay to activate any device you have
hooked to it (i.e., light, siren, CCTV).
• If the door shuts before the relay times out, the relay is
deactivated to stop "tailgating".
• To use this feature, install an 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 feet from the Infinity, use
shielded cable and connect the shield to the ground screw
shown in (Figure 6 and Figure 7).
BAUD RATE FOR RS-232 COMMUNICATION
The Infinity can receive and transmit data via an RS-232 serial
port at one of four baud rates (300, 1200, 2400, and 4800). The
factory setting is 4800 baud. If the connection between units is
intermittent, or failing, lower the RS-232 baud rate on the units
until the chain is able to communicate fully.
Change the baud rate by moving the jumper on the RS-232 BAUD
SEL shorting block (Figure 12).
NOTES:
• Make sure the baud rate is the same on all Multi-Link units in
the chain.
• Make sure the baud rate is the same for any external device
you connect, such as a printer or terminal.
Figure 12
15
RS232 Baud Sel
RS232 BAUD SEL
Infinity ROM 0
Rev. IL 6.32
OCT 2005