Installation Manual

ParSec
Reader
Installation Manual - Issue:3 - December 1998 - Page 6
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.
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 VDU screen.
2.3. Power Supply Requirements
The reader requires a 12V/100mA, 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”.