
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 60:
4x1 With Parity
or 4x2 Without
Parity
. You can reach
PARAMETER 60
in one of several ways. Press either:
•
6
then
0
, or
• the
key
NOTE: When the
is used, the
name
of the next parameter appears
immediately – not its
number.
SLOT 1 FORMAT 4X2 WO/P MM/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
4x1
(four by one), contains 6 characters:
• a four-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 5 characters that precede it. The
parity
digit accompanies the message (but is not displayed or
printed). When such a
4x1
message is received, the CP-220A
performs the same calculation on the first 5 digits and compares the
result with what was sent as the message's 6th
(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
4x1 report, it is not necessary to
send the entire message twice and compare them – a common
message-checking technique.
Another Reporting Format, known as
4x2
(four by two)
without parity,
also
contains six characters:
• a four-digit
Account Number
• a one-digit
Alarm Code
• a one-digit
Zone Code
This
4x2
format uses no parity checking. As a result, the CP-220A cannot
distinguish between messages received in the
4x1 (with parity)
and the
4x2
(without parity)
formats because both produce the same number of digits.
Therefore,
PARAMETER 60
is used to inform the CP-220A which of these two
formats it's meant to receive. Note that this selection can be made on a slot-by-
slot basis. See
Appendix B
for additional information on Reporting Formats.
NOTE: PARAMETER 60 will work for REC-11 Line Cards using Version 2.6
or later.
CP-220A Central Station Receiver Section 2: Programming the CP-220A Page 2-55
Hook-Up and Installation Manual