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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
Page 2-42 Section 2: Programming the CP-220A CP-220A Central Station Receiver
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
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
NOTE: When the
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.
key twice
is used, the name of the next parameter appears
Hook-Up and Installation Manual
key. To advance
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