Chapter Three Installation
MAN_105G_1.5 Page 22
Chapter 3 INSTALLATION
3.1
General
The 105G module is housed in a rugged aluminium case, suitable for DIN-rail mounting.
Terminals will accept wires up to 2.5 sqmm in size.
All connections to the module must be low voltage (SELV). Normal 110-240V mains
supply should not be connected to any terminal of the 105G module. Refer to Section 3.3
Power Supply.
Before installing a new system, it is preferable to bench test the complete system.
Configuration problems are easier to recognise when the system units are adjacent. Following
installation, the most common problem is poor communications caused by incorrectly
installed aerials, or radio interference on the same channel, or the radio path being inadequate.
If the radio path is a problem (i.e. path too long, or obstructions in the way), then higher
performance aerials or a higher mounting point for the aerial may rectify the problem.
Alternately, use an intermediate 105U Module as a repeater.
The foldout sheet 105U-G Installation Guide provides an installation drawing appropriate to
most applications. Further information is detailed below.
Each 105G module should be effectively earthed/grounded via the "GND" terminal on the
105U module - this is to ensure that the surge protection circuits inside the module are
effective.
3.2
Antenna Installation
The 105 module will operate reliably over large distances. The distance which may be reliably
achieved will vary with each application - depending on the type and location of antennas, the
degree of radio interference, and obstructions (such as hills or trees) to the radio path. Please
refer to your distributor for the expected maximum distance to comply with local radio
regulations. Where it is not possible to achieve reliable communications between two 105
modules, then a third 105 module may be used to receive the message and re-transmit it. This
module is referred to as a repeater. This module may also have input/output (I/O) signals
connected to it and form part of the I/O network - refer to Chapter 4 Configuration of this
manual.
An antenna must be connected to each 105 module using the coaxial female connector which
protrudes though one of the end plates.
To achieve the maximum transmission distance, the antennas should be raised above
intermediate obstructions so the radio path is true “line of sight”. Because of the curvature of
the earth, the antennas will need to be elevated at least 5 metres above ground for paths
greater than 5 km (3 miles). For short distances, the modules will operate reliably with some
obstruction of the radio path. Obstructions which are close to either antenna will have more
of a blocking affect than obstructions in the middle of the radio path. For example, a group
of trees around the antenna is a larger obstruction than a group of trees 100 metres from the
antenna.
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