
VI. SYSTEM COMMUNICATIONS
The 4171 XT-XM Dialer Board is required for polling
loop and/or wireless zone expansion, and for office
initiated downloading, and is also used to
communicate with the central station via dial
network telephone line, if that sewice is desired.
The 4171 XM can be used if only central station
communication and site initiated downloading is
desired. The 4171 XM does not support system
zone expansion or office initiated downloading.
CAUTION: 1. If the communicator is connected
to atelephone line inside aPABX, be sum the PABX
has aback-up power supply that can suppon the
PABX for 24 hours. Many PABXS are not power
backed up and connectionto such aPABX will result
in acommunication failure if power is lost.
2. Refer to the SUMMARY OF CONNECTIONS
diagrams for proper line seizure connections.
—COMMUNICATION FORMATS —
ADEMCO LOW SPEED
ADEMCO LOW SPEED is apulsed format which
responds to a 1400 HZ handshake and ki~-off, and
trSnSmitsdata Mth 1900Hz pUISStones @10 pulses
per second (pps). A~pi~l message consists of two
rounds which must be verifiid by the rece’wer.
In expanded reporting, fwo messages are sent, two
rounds per message, the first being the account
number and afarrn code, the second being the zone
(or channel) to which the alarm was assigned.
SESCOAIRADIONICS
Standard and expanded reporting in the
SESCONRADIONICS format is virtually the same
as ADEMCO Low Speed except:
1. The handshake and kiss-off frequency is 2300 Hz.
2. The data is transmitted with 1800 Hz pulse tones.
3. The rate of transmission is 20 pps.
4+2 REPORTING
A4+2 report consists of a4-digit account number
and a2digit alarm code, or event code.
4+2 reports can be accomplished in two ways:
1. Either in ADEMCO Low Speed (1Opps), or
SESCOAIRADIONICS (2o pps) format.
2. Etier in standard or expanded zone reporting.
The terms ‘standard” and “expanded* have a
siightiy different meaning than previously described.
in 4+2, 6tandard zone reporting sends a4-digit
account number foiiowed by a2-digit code, where
the first digit is the ALARM code and the second
digit is the channei to which the zone aiarm was
assigned. Ex. 1234 3 9 (code 3, channel 9).
In 4+2 expanded zone reporting aunique 2-digit
code for each zone ‘event- (27 zones max) is
reported. A4-digit account number foliowed by a
2-digit code is sent, where the first digit is the
actuai event, such as in ALARM, RESTORE, or
TROUBLE, etc., and the second digit of the code
represents the ‘zone” where the event occurred.
(but not neceesariiy the actuai zone number). Each
code in itseff is unique to aspecifii zone.
4+2 EXPRESS
ADEMCOS new ;.xpress format provides the same
informationas the 4+2 Expanded format except:
1. The data is transmitted in DTMF (Dual Tone
Multi-Frequency, known as “TouchTone=, at the
rate of 10 characters per second). This greatiy
decreases the time it takes areport to go through
to central station. An average 4+2 Low Speed
report might take as long as 20 seconds to complete
its report, but 4+2 Express takes under 3seconds.
2. Two message rounds are eliminated by the use of
achecksum digit. Instead of the communicator
sending 2rounds per repo~ it sends only 1round
with achecksum digit at the end. Doing this sfso
heips in decreasing the time it takes for areport to
be sent. (CHECKSUM is expiained further at the end
of this section).
3. The handshake frequency is 1400 Hz foiiowed
by 2300 Hz, and the kissoff frequency is 1400 Hz.
4. If the installation uses zones 28-84 and this
f~mn~ is se~cted, even~ in zones 28.w will not
t.- smitted .
#20 HIGH SPEED REPORTING
ADci,.20’s High Speed format tmnsmits data in
DTMF al arate of 10 characters per second. The
handshake frequency is 1400 Hz foiiowed by 2300
Hz, and the kiasoff frequency is 1400 Hz. The
message contains 13 digits as foilows: A4-digit
account number +eight channeis of zone
information (1-8 or duress pius 9-15) +one status
channel, which identifies the type of events being
reponed in the eight zone locations. Atypical High
Speed report will be kissed off in under 5seconds.
LIMITATIONS
1. When using Ademco high speed, remember
there are oniy 15 channeis avaiiabfe, pius aduress
channei. If more than 15 zones are being used, they
wiii have to share channels.
2. With high speed reporting, channels 9-15
cannot report troubies or bypasses. Use these
channeis for zones that wili not have to repon
these conditions.
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