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XL-1S Hookup and Installation Instructions
A–2
Parity is a number derived automatically by the dialer utilizing a mathematical formula (modulo 15).
Ex: 123 3 adds up to 9. This is subtracted from the next highest multiple of 15; in this case, 15 - 9
= 6. If the CS receiver accepts a valid parity digit, it considers the data transmission valid, delivers
a "Kissoff" and processes the data. The parity digit is not displayed. Its only purpose is for
validation of data transmitted. It is not a programmable digit; it is generated automatically by the
dialer when the parity option is selected in programming question #04, location 2. The obvious
advantage of using parity is speed. The transmission time between dialer and receiver is shorter
because fewer digits are transmitted with it as opposed to without it.
4X2
The 4X2 Reporting Format: AAAA EZ
Where:
AAAA = Four digit Account Number (PROG. QUESTS. #08 & 09)
E = Single digit Event code; it is the first of the 2 programmable reporting code digits
Z = Zone or User identifier; it is the second of the 2 programmable reporting code digits
This format is also in Pulse and is an alternative to the Extended format; it also transmits a
2 digit reporting code. Its specific meaning is a 4-digit account number followed by a 2-digit
alarm code. It can be transmitted with parity (1 round of data) or without parity (2 rounds of
data). There are 15 possible event codes, each of which can have 15 different zone identifiers.
As a result, a total of 225 individual events can be reported. It is different from the extended
format in the way it transmits. This is illustrated in the examples below:
4X2 W/O PARITY
4X2 W/PARITY
1234 31 (1st round
1234 31 5 (1st round)
1234 31 (2nd round)
1234 31 (resulting data) Burglary Zone 1
1234 31 (resulting data) Burglary Zone 1
Summary of Contents for XL-1S
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