Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 123 12/24/2010
6.2.4 AT+CMIC Change the Microphone Gain Level
AT+CMIC Change the Microphone Gain Level
Response
+CMIC: (list of supported <channel>s),(list of supported <gainlevel>s)
OK
Test Command
AT+CMIC=?
Parameters
See Write Command
Response
+CMIC: (0,<gainlevel>),(1,<gainlevel>),(2,<gainlevel>),(3,<gainlevel>)
OK
Read Command
AT+CMIC?
Parameters
See Write Command
Response
OK
ERROR
Write Command
AT+CMIC=
<channel>,<gainl
evel>
Parameters
<channel> 0 main audio handset channel
1 aux audio headset channel
2 main audio handfree channel
3 aux audio handfree channel
<gainlevel> int: 0 – 15
0 0dB
1 +1.5dB
2 +3.0 dB
3 +4.5 dB
4 +6.0 dB
5 +7.5 dB
6 +9.0 dB
7 +10.5 dB
8 +12.0 dB
9 +13.5 dB
10 +15.0 dB
11 +16.5 dB
12 +18.0 dB
13 +19.5 dB
14 +21.0 dB
15 +22.5 dB
Reference Note
Please refer to actual model for channel number.