REMEMBER!
To leave the Programming
Mode at any time, press
the
Esc
key. Doing so will
return the CP-220A to its
normal operating mode.
Programming changes will
be stored automatically.
PARAMETER 44:
3x1 With Parity
Default:
The Line Fault detection capability for each slot is set to
ON.
Advancing to Next Parameter:
The next parameter in
Category A
is
PARAMETER 44.
Because it is not
sequential, it cannot be reached with a single press of the
key. To advance
to
PARAMETER 44,
press the
N
key.
The CP-220A displays the parameter just programmed ([PARAMETER
NUMBER 42]) with its first digit flashing, indicating its request for the
desired parameter number. Press either:
•
4
then
4
, or
•
then
4
, or
• the
key twice
NOTE: When the
is used, the
name
of the next parameter appears
immediately – not its
number.
SLOT 1 FORMAT 3X1 W/P M/DD/YY HH:MM:SS
Background:
The CP-220A is capable of receiving and processing many popular alarm
Reporting Formats originated at a subscriber’s premises (see
Appendix B).
One of these formats, known as
3x1
(three by one), contains 5 characters:
• a three-digit
Account Number
• a one-digit
Alarm Code
• a one-digit
Parity Check
sent along with the message
NOTE: Typically, this single
parity
digit contains a number that is derived
through a calculation based on the 4 characters that precede it. The
parity
digit accompanies the message (but is not displayed or
printed). When such a
3x1
message is received, the CP-220A
performs the same calculation on the first 4 digits and compares the
result with what was sent as the message's 5th
(parity)
digit. If
they are identical, it's quite likely that the message was received
accurately.
Using this
parity
technique allows the receiver to process messages
faster because, unlike the
standard
3x1 report, it is not necessary to
send the entire message twice and compare them - a common
message-checking technique.
Page 2-42 Section 2: Programming the CP-220A CP-220A Central Station Receiver
Hook-Up and Installation Manual
