Chapter Two
Installation
man_105_2.9.doc
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9
Chapter Two
INSTALLATION
2.1
General
The 105 module is housed in a rugged aluminium case, suitable for DIN-rail mounting. Terminals
are suitable for cables up to 2.5 sqmm in size.
Normal 110/220/240V mains supply should not be connected to any input terminal of the 105
module.
Refer to Section 2.3
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 on the radio channel or the serial channel. For
radio modules, problems are caused by incorrectly installed antennas, 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 antennas or a higher mounting point for the
antenna may fix the problem. Alternately, use an intermediate 105 module as a repeater.
For serial modules, poorly installed serial cable, or interference on the serial cable is a common
problem.
The foldout sheet 105 Installation Guide provides an installation drawing appropriate to most
applications. Refer to Appendix B of this manual for terminal layout drawings of the modules.
Each 105 module should be effectively earthed via a "GND" terminal on the 105 module - this is to
ensure that the surge protection circuits inside the 105 module are effective.
2.2
Antenna Installation
(105U units only)
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