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BASIC OPERATIONS
■ Data bits: 8
■ Parity: none
■ Stop bit: 1
■ Flow control: hardware
To confirm you are communicating with the device:
■ Type AT and press Enter.
If the device responds with OK, you are communicating with the device.
Verifying Signal Strength
To verify the device signal strength, enter:
AT+CSQ
The command indicates signal quality, in the form:
+CSQ: <rssi>,<ber>
Where:
<rssi> Received signal strength indication.
0 (-113) dBm or less
1 (-111) dBm
2-30 (-109) dBm - (-53) dBm / 2 dBm per step
31 (-51) dBm or greater
99 Not known or not detectable
<ber> Bit error rate, in percent
0 Less than 0.2%
1 0.2% to 0.4%
2 0.4% to 0.8%
3 0.8% to 1.6%
4 1.6% to 3.2%
5 3.2% to 6.4%
6 6.4% to 12.8%
7 More than 12.8%
99 Not known or not detectable
QuickCarrier
TM
USB-D EV-DO MTD-EV3 User Guide 15