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This security system is designed to transmit data to a central station receiver when an
alarm, system trouble, or opening/closing occurs. Due to the many different types of CS
receivers in the market, this system can transmit data in various formats. Each installing
company determines which format best suits its needs based on many factors. A major
factor is the CS receiver type.
In transmitting data to the CS receiver, the first event that occurs is that the system's
digital communicator will seize the home phone lines. Then, it will dial the CS#1 telephone
number. When the CS receiver picks up the ringing phone line, it will transmit a
"Handshake" frequency (1400Hz, 2300Hz or HiLo) back to the digital communicator. After
receiving the "Handshake" frequency, the digital communicator will transmit the data in
the format programmed in Question 15, L1-L4. Assuming the CS receiver verifies the data
transmission as valid (after 2 successful rounds of data or 1 valid parity round), it will
transmit a "Kissoff" frequency back to the digital communicator. This causes the
communicator to stop transmitting, unless more data is available, in which case additional
data transmissions and "Kissoffs" will occur. After the final "Kissoff", the CS receiver will
release the phone line and process the data to its display and associated peripherals
(computer and printer). If for any reason the digital communicator, does not receive the
"Kissoff", it will proceed to dial the CS#2 telephone number or dial again the CS#1
telephone number (if CS#2 is not used). It will continue to dial for a programmed number of
times until a "Kissoff" is received. If after dialing all attempts for each CS Telephone
number programmed a "Kissoff" is not received, the system will display "Communication
Failure" at the keypad. This message is cleared after the next successful transmission or by
the user at the keypad.
The following is a general description of the various formats transmitted by this system.
Standard (3x1 or 4x1)
The Standard Reporting Format: AAA E or AAAA E where:
AAAA = Three or Four digit Account Number
E = Single digit Event code; it is the first of the 2 programmable reporting code digits
Standard format is transmitted in Pulse and involves a 3 or 4 digit account number followed
by a single-digit event code. It can be transmitted with parity (1 round of data) or without
parity (2 rounds of data). A disadvantage of this format is that it can only transmit a total of
15 event codes (0 - 9, B - F) without identifying zones or users. Examples:
3x1 w/o PARITY
123 3 (1st round)
123 3 (2nd round)
123 3 (resulting data)
4x1 w/o PARITY
1234 3 (1st round)
1234 3 (2nd round)
1234 3 (resulting data)
Parity is a number derived automatically by the dialer utilizing a mathematical formula (modulo
15). E.g., 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 15, L2/L4. 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.
3x1 w/PARITY
123 3 6 (single round)
123 3 (resulting data)
4x1 w/PARITY
1234 3 2 (single round)
1234 3 (resulting data)
S E C T I O N
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