User's Manual

GSM/GPRS Module Series
M35 User Manual
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Table 15: QPCMON Command Description
―AT+QPCMVOL‖ can configure the volume of input and output.
AT+QPCMVOL=vol_pcm_in, vol_pcm_out
Table 16: QPCMVOL Command Description
3.10. SIM Card Interfaces
The module contains two smart interfaces to allow module access to the two SIM cards. These two SIM
interfaces share the same ground and only SIM1 interface has card inserted detection. Only one SIM card
can work at a time. For more details, please refer to the document [6].
3.10.1. SIM Card Application
The SIM interfaces supports the functionality of the GSM Phase 1 specification and also supports the
functionality of the new GSM Phase 2+ specification for FAST 64 kbps SIM card, which is intended for
use with a SIM application Tool-kit.
Parameter
Scope
Description
Mode
0~2
0: Close PCM
1: Open PCM
2: Open PCM when audio talk is set up
Sync_Type
0~1
0: Short synchronization
1: Long synchronization
Sync_Length
1~8
Programmed from one bit to eight bit
SignExtension
0~1
0: Zero padding
1: Sign extension
MSBFirst
0~1
0: MSB first
1: Not support
Parameter
Scope
Description
vol_pcm_in
0~32767
Set the input volume
vol_pcm_out
0~32767
Set the output volume
The voice may be distorted when this value exceeds 16384.