Contact Id Protocol Compatibility - Tunstall Caresse Installation And Programming Manual

Contact ID protocol compatibility

References: Digital Communication Standard – Ademco Contact ID Protocol for alarm
system communications. SIA DC-051999.09 published by Security Industry Association.
Introduction
Contact ID protocol is a common protocol used by PERS products to communicate with
an alarm receiver. It allows for the transmission of equipment ID, call type information
and checksum.
The Caresse is configured to respond to a Contact ID handshake from a monitoring
receiver and use Contact ID protocol. This section describes the call handling protocol
and enables the Caresse to work with the majority of alarm receivers that are available
from vendors, including the Osborne Hoffman 2000, and SurGard System III receivers.
Call modes
The Caresse can work in three modes depending on the type of call. The standard mode
is "Listen In" mode for emergency calls that require 2 way voice – Caresse sends a
606 "listen in to follow" code and opens a two way speech connection and allows the
receiving system to route the call through to an operator.
In "background call" mode, the Caresse won't send the 606 code and will
automatically drop the line after the code has been acknowledged and reset back to
quiescent state. This is typical for information calls that do not require two way voice or
direct operator intervention.
"Call back" mode can be configured using PC connect software. This mode is an
alternative to "Listen in" mode for emergency calls. After sending its data, the Caresse
will clear the line and wait for the operator to call back. When the Caresse receives
ringing it will automatically answer and allow two way voice.
In "listen in " mode, an operator handling a call can reset the call into a suspended state
which either requires a responder to visit the dwelling and press the green cancel key, or
a subsequent command from the operator at the monitoring center to remotely reset the
call completely. This is described in the flow diagram on the following page.
Some guidelines
The Contact ID call handling presents a few issues that need to be considered: -
The initial alarm call will follow the call sequence as programmed into the unit. It is
important that when a 'help arrived' reset call is made that it is made to the same
telephone number that the original alarm went.
If during the 'suspend' period, a new alarm is raised and it is accepted by an Contact ID
monitoring station then the previous alarm that was being suspended will no longer be
serviced (i.e. the first 'help arrived' call will be lost and a new alarm will take
precedence). This functionality is incorporated with the view that the new alarm call is
more important than the 'help arrived' reset call.
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