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 59:
4x2 With Parity
Programming Procedures:
After entering
PARAMETER 58,
[FORMAT DATE MONTH/DAY] will be
displayed. Use the
NEXT
key to toggle between placing the month first (the
default) or [DAY/MONTH], the alternative.
Advancing to Next Parameter:
After programming
PARAMETER 58,
press the
N
key to advance to
PARAMETER 59
– the next parameter in
Category A
.
The CP-220A displays the parameter just programmed ([PARAMETER
NUMBER 58]) with its first digit flashing, indicating its request for the next
parameter number.
You can reach
PARAMETER 59
in one of several ways. Press either:
•
5
then
9
, or
•
then
9
, or
• the
key three times
NOTE: When the
is used, the
name
of the next parameter appears
immediately – not its
number.
SLOT 1 4X2 AT 40PPS MM/DD/YY HH:MM:SS
Background:
The CP-220A is capable of receiving and processing many popular alarm
Reporting Formats (see
Appendix B).
One such format, known as
4x2
(four
by two)
with parity,
is quite popular, and contains:
• a four-digit
Account Number
• a one-digit
Alarm (Event) C
• a one-digit
Zone I.D.
Also sent along with the message (but not displayed or printed) is a single
parity
digit containing a number that is derived through a calculation based
on the 6 characters that precede it. When such a
4x2
message is received,
the CP-220A performs the same calculation on the first 6 digits and
compares the result with what was sent as the message's 7th
(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
4x2 report (which sends the
entire message twice and compares them with each other), the parity
technique requires only one round to process the data and confirm its
accuracy, rather than two. The
4x2 (with parity)
format may be transmitted
using rotary pulses at 40 pps (pulses per second).
CP-220A Central Station Receiver Section 2: Programming the CP-220A Page 2-53
Hook-Up and Installation Manual