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SECTION 23
System Communication
This section provides the following information:
• The process of a successful transmission
• An explanation of reporting formats for this system
• Loading communication defaults
• Contact ID report codes
A Successful Transmission
When a control panel calls the central station receiver, it waits to hear a
“handshake” frequency from the receiver to confirm that the receiver is on-
line and ready to receive its message. Once the panel hears the handshake it
is programmed to listen for, it sends its message. The panel then waits for a
“kissoff” frequency from the receiver acknowledging that the message was
received and understood.
If the handshake frequency is not given or is not understood by the panel, the
panel will not send its message. Once the handshake frequency is received
and understood by the panel, the panel will send its message. If there is an
error in the transmission (the receiver does not receive a “valid” message),
the kissoff frequency will not be given by the central station receiver.
The panel will make a total of eight attempts to the primary telephone
number and eight attempts to the secondary telephone number (if
programmed) to get a valid message through. If the panel is not successful
after its numerous attempts, the keypad will display “Communication
Failure” (Alpha keypad).
Reporting Formats
The following chart defines the three sets of (handshake/kissoff) frequencies
that the panel supports and the different formats that can be sent for each.
FORMAT
HANDSHAKE
TRANSMITS DATA
KISSOFF
TRANSMIT TIME
Low Speed
1400Hz
1900Hz (10PPS)
1400Hz
Under 15 secs.
3+1
(Standard report)
4+1
4+2
Sescoa/Rad
2300Hz
1800Hz (20PPS)
2300Hz
Under 10 secs.
3+1
(Standard report)
4+1
4+2
Express
1400–2300Hz
DTMF (10 cps)
1400Hz
Under 3 secs.
4+2
High Speed
1400–2300Hz
DTMF (10 cps)
1400Hz
Under 5 secs.
Contact ID
1400–2300Hz
*
DTMF (10 cps)
1400Hz
Under 3 secs.
* Only 2300Hz for Robofon version
ADVISORY: Ademco's Contact ID reporting is capable of uniquely reporting
all 128 zones of information, as well as openings and closings for all 150
users, to central stations equipped with the Ademco 685 receiver using
software level 4.4 or higher. Must be level 4.7 or higher to fully support all
new VISTA-120 report codes. 685 software levels below 4.4 cannot support
Contact ID reporting. For information regarding updating the 685 receiver,
contact your nearest Ademco Support location.
