Gallagher C300400 Installation Notes page 5

2.3 Cabling
The Gallagher T10 Reader requires a minimum cable size of 4 core 24 AWG (0.2 mm
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 specified 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 communications protocol is based on the RS485 standard and allows the reader to
communicate over a distance of up to 500 m (1640 ft).
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 multiple HBUS devices to
be individually wired to the one physical location.
The end devices on the HBUS cable should be terminated using 120 ohms resistance. To
terminate the Gallagher Controller 6000, connect the supplied on-board termination jumpers
to the Controller. To terminate a reader, connect the orange (termination) wire to the green
(HBUS A) wire. Termination is already included at the HBUS Module, (i.e. each HBUS port is
permanently terminated at the module).
HBUS
Device
Terminate
HBUS
Device
Terminate
3E4288 Gallagher T10 Reader | Edition 1 | August 2016
Copyright © Gallagher Group Limited
HBUS
Device
HBUS HBUS
Device Device
"T" or "Star" circuits are
HBUS
not permitted between
Device
HBUS devices
RS485 1
HBUS
Device
Controller 6000
Remove the on-board
termination jumper
"T" or "Star" circuits are
not permitted between
HBUS devices
HBUS
Device
HBUS
Device
) stranded
2
RS485 1
Controller 6000
Connect the on-board
termination jumper
HBUS
Device
Terminate
Page 5