Turning On The Rx And Reading Rssi In Gsm Mode - Sierra Wireless MC8775 Reference Manual

MC87xx Extended AT Command Reference
82
Table 5-5: Command sequence for reading the RSSI
in WCDMA mode (Continued)
Command
4.
AT!DAWSCONFIGRX
=9263,-80
5.
AT!DAWGRXAGC
Calculating the RSSI in dBm from the AGC value
To convert the <AGC_value> returned by
units of dBm, use this calculation:
if (<AGC_value> < 511)
<RX_dBm> = -106 + ( ( <AGC_value> + 512 ) / 12 )
else
<RX_dBm> = -106 + ( ( (<AGC_value>-1024) + 512 ) / 12 )
Turning on the RX and reading RSSI in
GSM mode
The following command sequence turns on the receiver and
reads the RSSI.
Table 5-6: Command sequence for reading the RSSI in
GSM mode
Command
1.
AT!ENTERCND=
"password"
2.
AT!DAFTMACT
3.
AT!DASBAND=12
4.
AT!DASCHAN=661
5.
AT!DAGSRXBURST=0
6.
AT!DASLNAGAIN=0
7.
AT!DAGGRSSI
Function
Configures the WCDMA receiver
using the factory calibration
information for channel 9263 at the
expected RX level of -80 dBm
Reports the RX AGC value. This
can be converted to dBm using the
calculation below.
!DAWGRXAGC
Function
Enters the password, providing
access to the necessary commands
Puts the modem into factory test
mode
Sets the frequency band to GSM
1900
Sets the channel to 661
Sets the radio so that it can read the
RSSI
Sets the LNA (Low Noise Amplifier)
range to the highest gain. See
the LNA gain below.
Reports the channel, LNA state, and
RSSI in dBm using the calibration
offsets
to
Setting
2130616