User manual

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5 Installation of the modem
This chapter gives you advice and helpful hints on how to integrate the GT864 E Terminal into
your application from a hardware perspective. Please read the information given in “Safety and
Product Care”, page 10 and then read the information in this section before starting your
integration work.
5.1 Where to install the modem
There are several conditions which need to be taken into consideration when designing your
application as they might affect the modem and its function. They are:
5.1.1 Environmental conditions
The modem must be installed so that the environmental conditions stated in the Technical Data
chapter, such as temperature, humidity and vibration are satisfied. Additionally, the electrical
specifications in the Technical Data section must not be exceeded.
5.1.2 GSM Signal strength
The modem has to be placed in a way that ensures sufficient GSM signal strength. To improve
signal strength, the antenna can be moved to another position. Signal strength may depend on
how close the modem is to a radio base station. You must ensure that the location, at which
you intend to use the modem, is within the network coverage area. Degradation in signal
strength can be the result of a disturbance from another source, for example an electronic
device in the immediate vicinity. More information about possible communication disturbances
can be found in section 5.3.5.
When an application is completed, you can verify signal strength by issuing the AT command
AT+CSQ. See “AT+CSQ Signal Strength”.
Tip! Before installing the modem, use an ordinary mobile telephone to check a possible
location for it. In determining the location for the modem and antenna, you should consider
signal strength as well as cable length
5.1.3 Connections of components to GT864 E Terminal
The integrator is responsible for the final integrated system. Incorrectly designed or installed,
external components may cause radiation limits to be exceeded. For instance, improperly made
connections or improperly installed antennas can disturb the network and lead to malfunctions
in the modem or equipment.