User's Manual

Page 2
Gallagher T20 Reader
Document Code: 3E3140
Edion 3, April 2013
Installaon Note
IMPORTANT: Gallagher T20 Mul Tech readers only:
Using dual technology 125/Mifare cards with Gallagher T20 Mul Tech readers
may cause both card technologies to be read, resulng in double card badges
and unusual reader feedback. Gallagher strongly recommends against using dual
technology 125/Mifare cards with Gallagher Mul Tech readers for sites running
pre-Command Centre v7.00 soware. From Command Centre v7.00, a site may
specify which technology a Mul Tech reader should read o a dual technology
card.
Before you begin
Shipment Contents
Check the shipment contains the following items:
• 1 x Gallagher T20 Reader facia assembly
• 1 x Gallagher T20 Reader base
• 2 x 6-32 UNC Phillips drive xing screws
• 2 x M3.5 Phillips drive xing screws
• 5 x 25 mm No.6 self tapping, pan head, Phillips drive xing screws
• 5 x 40 mm No.6 self tapping, pan head, Phillips drive xing screws
• 1 x M3 Torx Post (T10) Security screw
Power Supply
The Gallagher T20 Reader is designed to operate over a supply voltage range
of 9 - 16 Vdc measured at the reader terminals. The operang current draw is
dependent on the supply voltage at the reader. For the Mifare reader, at 12 Vdc
the current draw is 90 mA (standby). During card read, beeper and LED acvity, the
current will momentarily reach 125 mA (peak). For the Mul Tech reader, at 12 Vdc
the current draw is 90 mA (standby) and will momentarily reach 140 mA (peak).
The power source should be linear or a good quality switched-mode power supply.
The performance of the reader may be aected by a low quality, noisy power supply.
Cabling
The Gallagher T20 Reader requires a minimum cable size of 4 core
24 AWG (0.2 mm
2
) stranded security cable. This cable allows the transmission of
data (2 wires) and power (2 wires). When using a single cable to carry both power
supply and data, both the power supply voltage drop and data requirements must
be considered. Although the reader is specied to operate at 9 Vdc, for good
engineering design it is recommended that the voltage at the reader should be
approximately 12 Vdc.
Examples of approved cables for connecng a single Gallagher T20 Reader to a
Controller and power supply, showing maximum cable lengths for each type of cable
and the associated circuits are: