AT Command Manual for Sierra MC87XX Module

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