9
COMMUNICATIONS WIRING FOR SINGLE-READER SYSTEMS
The
ENTRACOMP
®
28SA-Plus
is designed to communicate with a printer,
terminal, personal computer or a modem, using an RS-232 interface.
The
wiring for a printer cable is different from the wiring for a PC or Terminal.
(see Figures 2 through 9 for communications wiring instructions).
Cable distances of up to 100 feet (30.48 meters) are possible, using high-
quality shielded cable, with the shield connected to Earth ground at the reader
end. Use six-conductor, shielded cable, 18-24 AWG. Do Not use twisted pairs.
Recommended Cable is Eastman 725-57720SJ.
DO NOT USE un-shielded
and/or twisted pair wire, such as “Category 5” for RS-232 communications.
Route communications wiring away from equipment that generates RF
interference, such as transmitters, fluorescent light ballasts, large motors,
compressors, elevators, etc.
Whenever communications cable runs enter or exit a building, lightning transient
suppressors are strongly recommended at both ends of those cables. Parking
lot, pool gate, marina and tennis court applications with long buried cable runs
are susceptible to nearby lightning strikes, and unprotected Readers, PC’s,
and Printers are frequently damaged. See Addendum D.
Wire runs of up to 4,000 feet are possible using “line drivers” (RS-232/422
converters). One converter is required
at each end
of a
two-twisted pair
overall-shielded cable. Each converter will require AC power. If you have
already pulled wire for RS-232 and need to add RS422 converters, new
twisted-pair cable must be pulled. Contact Secura Key for the correct converter
model for your specific application.
MODEM COMMUNICATIONS.
The
ENTRACOMP
®
28SA-Plus
has been designed
to communicate with a PC or terminal via modem in
auto answer mode
with
any Hayes compatible modem (minimum 1200 baud). The modem must be
Summary of Contents for ENTRACOMP 28SA Plus
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