User manual

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5.1.4 Network and Subscription
Before your application is used, you must ensure that your chosen network provides the
necessary telecommunication services. Contact your service provider to obtain the necessary
information.
 If you intend to use SMS in the application, ensure this is included in your (voice) subscription.
 Consider the choice of the supplementary services
5.2 How to install the modem
5.2.1 Power supply
Use a high-quality power supply cable with low resistance. This ensures that the voltages at
the connector pins are within the allowed range, even during the maximum peak current.
When the unit is powered from a battery or a high current supply, connect a fast 1.25A fuse in
line with the positive supply. This protects the power cabling and modem.
5.2.2 Securing the modem
Before securing the modem take into account the amount of additional space required for the
mating connectors and cables that will be used in the application.
 Where access is restricted, it may be easier to connect all the cables to the modem prior to
securing it in the application.
 Securely attach the GT864 E Terminal modem to the host application using two 3mm diameter
pan-head screws
5.3 Antenna
5.3.1 General
The antenna is the component in your system that maintains the radio link between the
network and the modem. Since the antenna transmits and receives electromagnetic energy, its
efficient function will depend on:
 the type of antenna (for example, circular or directional);
 the placement of the antenna;
 Communication disturbances in the vicinity in which the antenna operates.
In the sections below, issues concerning antenna type, antenna placement, antenna cable, and
possible communication disturbances are addressed. In any event, you should contact your
local antenna manufacturer for additional information concerning antenna type, cables,