User's Manual

Page 5
3E4234 Gallagher T21 PIV Reader | Edion 1 | August 2016
Copyright © Gallagher Group Limited
2 Before you begin
2.1 Shipment contents
Check the shipment contains the following items:
• 1 x Gallagher T21 PIV Reader facia assembly
• 1 x Gallagher T21 PIV Reader bezel
• 2 x 6-32 UNC (32 mm) Phillips drive xing screws
• 2 x M3.5 (40 mm) 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
2.2 Power supply
The Gallagher T21 PIV Reader is designed to operate over a supply voltage range of 9 - 16 Vdc
measured at the readers terminals. The operang current draw is dependent on the supply
voltage at the reader.
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.
2.3 Cabling
The Gallagher T21 PIV 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.
HBUS cabling topology
The HBUS communicaons protocol is based on the RS485 standard and allows the reader to
communicate over a distance of up to 500 m (1640 ).
The cabling between HBUS devices should be done in a "daisy chain" topology, (i.e. A "T" or
"Star" topology should not be used between devices). Should "Star" or "Home-Run" wiring be
required, the HBUS 4H/8H Modules and the HBUS Door Module allow mulple HBUS devices to
be individually wired to the one physical locaon.
The end devices on the HBUS cable should be terminated using 120 ohms resistance. To
terminate the Controller, connect the supplied on-board terminaon jumpers to the Controller.
To terminate the Gallagher T21 PIV Reader, connect the orange (terminaon) wire to the green
(HBUS A) wire. Terminaon is already included at the HBUS Module, (i.e. each HBUS port is
permanently terminated at the module).