Gallagher HBUS 16 In 16 Out Board User Manual

3E3473 Gallagher HBUS 16 In 16 Out Board Installation Note | Edition 10 | January 2021
Copyright © Gallagher Group Limited Page 5
2.4 Building Cabling
The Gallagher HBUS 16 In 16 Out Board 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.
HBUS Cabling Topology
The HBUS communications protocol is based on the RS485 standard and allows the board 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).
Termination
The start and end devices on an HBUS circuit should be terminated using 120 ohm resistance.
If the HBUS 16 In 16 Out Board is the start or end device on an HBUS circuit, terminate the board
by connecting the supplied on-board termination jumper (J28) to the board. The location of the
termination jumper (J28) is shown in the topic "Component Layout" later in this note.
HBUS Cabling Topology Diagrams

Gallagher HBUS 16 In 16 Out Board Specifications

General

Brand	Gallagher
Model	HBUS 16 In 16 Out Board
Category	Controller
Language	English