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DESCRIPTION OF 4/2 FORMAT
The 4/2 format consists of a four-digit account code, from 0000 to FFFF and a two-digit alarm code from 00 to FF.
When the digital communicator calls the central station receiver, the latter answers and sends a brief 2300 Hz tone or
a 1400 Hz tone called a "Handshake" tone. The digital communicator then reports digits of the account and alarm
codes as bursts of either (1800 Hz) or (1900 Hz) tone; the digit 8 is represented by eight bursts of tone. A message,
or "round" consists of an account code and an alarm code. Two rounds are sent, and two consecutive rounds must
match at the receiver. If they do, the central station receiver sends another brief 2300 Hz or 1400 Hz tone to
acknowledge to the digital dialer that the message has been properly received. If the rounds don't match, the receiver
does not send the second tone and the digital dialer tries again, up to 5 times. If the rounds are not acknowledged
after 5 tries, the digital dialer hangs up and tries the entire call again.
The digital communicator can report alarm zone trips, alarm cancels, low battery, and fire zone trouble. It may also be
setup to generate an automatic test signal at periodic intervals. The communicator may be setup to call second
phone number using a second account number in the event that it is unable to communicate successfully using the
first phone number and account.
The digital communicator is setup at the factory to transmit a code when the battery is low or trouble with the fire zone
is detected. If these codes are set to 0 or 00, no code will be sent when the trouble condition is detected.
Although the alarm codes can be changed, we recommend that the alarm codes setup at the factory be used to
minimize the risk of installer error in programming the digital communicator. Simply enter the phone numbers and
account codes, then verify the alarm codes.
3/1 FORMAT
Older central stations may require a 3/1 format. To use 3/1 format, both account numbers must be changed to 3 digit
codes and EVERY alarm code must be changed to a 1-digit code. Do not mix code lengths!
OPENING AND CLOSING REPORTS
The Omni LTe system can send opening and closing reports by user to the central station.
When the system is disarmed by user code 1-16, the communicator can call the central station and report that the
system was disarmed (opened) with the user code that was used.
When the system is armed by user code 1-16, the communicator can call the central station and report that the
system was armed (closed) with the user code that was used.
If any other code or a method disarms the system (i.e. Keyswitch or Scheduled Program), the communicator will send
a generic OPEN report to the central station. The code that is sent is defined as OTHER OPEN. If the system is
armed by any other method other than one that requires a code (i.e. Quick Arm, Keyswitch, or Scheduled Program),
the communicator will send a generic CLOSE report to the central station. The code that is sent is defined as OTHER
CLOSE.
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