User guide

CM52 Integrators’ Manual

WI_DEV_CM52_UGD_001-001

Page 50 of 53

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5 Hints for Integrating the Wireless CPU

This section, which gives you advice and helpful hints on how to integrate the CM52 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

Following is a list of preparations that you should make before beginning the integration work that

is described in this section.

 Where to install the Wireless CPU

 Safety standards

 Network and subscription

 Antenna

5.2 Where to Install the Wireless CPU

Make sure that the Wireless CPU

is installed in proper environmental conditions such that

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 Wireless CPU

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 Manual for a description of this and other useful AT commands.

Tip! Before installing the Wireless CPU

, 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

Wireless CPU

and antenna. That way you will find out if it is practical to install the Wireless CPU

where you intended.

5.3 Safety Standards

You are responsible for observing your country’s safety standards and the relevant wiring rules,

where applicable.