User Manual

ParSec Reader Installation Manual - Issue:2 - January 1998 - Page 5
mount the reader as high as possible or even facing downwards from the
ceiling so that bodies do not shield the reader. In some cases it may be
necessary to mount more than 1 reader to provide adequate coverage.
(3) The readers are not weather-resistant and so must only be mounted outside in
an all plastic suitably rated enclosure.
CAUTION
In common with all low power radio frequency based systems, ParSec Universal Readers
should be sited as far away as practicable from sources of electromagnetic interference.
Whilst the internal surfaces of ParSec Readers are partially screened, it is strongly advised
that they should not be mounted close to VDU screens, TV monitors or other sources of radio
frequency emission. The minimum recommended separation is 1.5m from a 15 inch CRT
screen.
2.3. Power Supply Requirements
The reader requires a 12V/300mA, DC power supply, which must be CE approved.
The on board voltage regulator allows the input voltage to vary +/- 3 volts from the nominal
12 volt supply. The reader is protected against reverse polarity but not voltages greater than
16V.
It is recommended that power and signal cables to the reader should be separated from 3-
phase mains supplies by at least 1m and from single phase mains supplies and all types of
cable runs by at least 0.5m. Use screened cables e.g. 2-core Belden 8760 for reader power,
2-core Belden 8761, 9841 or 9501 for RS-232 and 6-core screened e.g. Belden 9536 for
Wiegand data and LED drive. Connect the screen to earth/ground at the remote end.
2.4. Communications Interfaces
2.4.1. RS-232 Data Port (PSR-232-1 model only)
Serial data input and output connections and switch settings are detailed in Section 4.6.1. Full
details of the RS-232 protocol are contained in the separate document “ParSec reader RS-232
Data Specification”.