Digicom pocket GSM User Manual page 9

PocketGSM
You can check the signal:
Using a cellular phone
Insert the SIM of the PocketGSM in a cellular phone and check the quality of the signal.
Through the Led STATUS
Power on the modem and verify the STATUS Led. If it is red blinking, it means the modem is recognized
by the GSM network. In this way you can check the signal but not its quality.
Attention: even if you see the STATUS Led blinking, it may not be sufficient for data transmission.
Through the AT+CSQ command
By using this command it is possible to detect a more precise signal. Power on PocketGSM and connect
it to a Personal cpmputer, using a serial cable. With a hyperterminal send to the modem the command
AT+CSQ.
The modem will answer with +CSQ: x,y; where "x" is the signal quality, "y" is the BER (But Error Rate).
The value of "x" can be included between 0 to 31; the higher value indicates a better signal.
From 0 to 9 : poor
From 10 to 15 : good
From 16 to 31 : excellent
99 = Unknown or uncalculable
BER values higher than 2 may compromise the good operation of the device. In this case place the
antenna in a better position.
[ For further information about commands, see the chapters "Functional Examples" and "AT
Commands"; you'll find the "AT Commands" chapter in the user's manual present on Digicom
website ]
Attention: for better performances of the supplied stilo antenna, we suggest to position it upwards. Try
to fix Pocket GSM and its antenna at least one meter from the floor.
In case you use a different antenna, do not fix it directly to the mechanics of the product or on
metal surfaces.
2.3
Installation