Installation of the modem
INSYS GPRS mini
8
Installation of the modem
This chapter gives you advice and helpful hints on how to integrate the IN-
SYS GPRS mini into your application from a hardware perspective. Please
read the information given in “Safety and Product Care” and then read the
information in this section before starting your integration work.
8.1
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:
8.2
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 sec-
tion must not be exceeded.
8.3
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 possi-
ble communication disturbances can be found in section “Possible commu-
nications distrubances”.
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 an-
tenna, you should consider signal strength as well as cable length
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