User Manual

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USERS MANUAL
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Document number Revision
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4 Functional Description
The CM52 module performs a set of telecom services according to TIA/EIA-IS-2000.
The functions of the display and keypad, usually used to make calls, are implemented
by issuing AT Commands over the serial interface.
See the CM52 Software User's Guide and AT Command Manual for a complete
functional description and user scenarios for the CM52.
5 Hints for Integrating the Module
This section, which gives you advice and helpful hints on how to integrate the CM-52
with the application, should be taken as a guide.
Note! The circuits on the test board are not shielded. Therefore, take proper
precautions for avoiding ESD and EMI.
5.1 Precautions
Here is a list of preparations that you should make before beginning the integration
work that is described in this section.
• Where to install the module.
• Safety standards
• Network and subscription
• Antenna
5.2 Where to Install the Module
Make sure that the module is installed so that the environmental conditions, such as
temperature, humidity, vibration, etc., are not beyond the limits specified for it.
Make sure that the signal strength is sufficient. To improve signal strength, move the
antenna to another position. Signal strength may depend on how close the module is to
a radio base station. Degradation in signal strength could be a result of disturbance
from another source, for example, an electronic device nearby.
You can verify signal strength by issuing the AT command AT+CSQ. See the CM52
Software User’s Guide and AT Command for a description of this and other useful AT
commands.
Tip! Before installing the module, use an ordinary mobile telephone to check a possible
location for it. Consider signal strength as well as cable length in determining the
location for the module and antenna. That way, you will find out if it is practical to install
the module where you intended.
5.3 Safety Standards
You are responsible for observing your country’s safety standards and the relevant
wiring rules, where applicable.