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SIM800 Series_PCM_Application Note_V1.02.pdf
About Document
Version History
Scope
Contents
1 Introduction
1.1 Purpose of the document
1.2 Related documents
1.3 Conventions and abbreviations
2 AT Commands
2.1 AT+CHFA Swap the Audio Channels
2.2 AT+CPCMCFG Set PCM Parameter
2.3 AT+CPCMSYNC Set PCM Sync Parameter
3 PCM Examples
SIM800 Series_PCM
_Application Note
GPRS Module
SIMCom Wireless Solutions Limited
Building B, SIM Technology Building, No.633, Jinzhong Road
Changning District, Shanghai P.R. China
Tel: 86-21-31575100
support@simcom.com
www.simcom.com
SIM800 Series_PCM_Application Note_V1.02
SIM800 Series_PCM_Application Note
1.02
2020.6.15
Released
Document Title:
Version:
Date:
Status:
GENERAL NOTES
SIMCOM OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS, TO SUPPORT
APPLICATION AND ENGINEERING EFFORTS THAT USE THE PRODUCTS DESIGNED BY SIMCOM.
THE INFORMATION PROVIDED IS BASED UPON REQUIREMENTS SPECIFICALLY PROVIDED TO
SIMCOM BY THE CUSTOMERS. SIMCOM HAS NOT UNDERTAKEN ANY INDEPENDENT SEARCH
FOR ADDITIONAL RELEVANT INFORMATION, INCLUDING ANY INFORMATION THAT MAY BE IN THE
CUSTOMER’S POSSESSION. FURTHERMORE, SYSTEM VALIDATION OF THIS PRODUCT
DESIGNED BY SIMCOM WITHIN A LARGER ELECTRONIC SYSTEM REMAINS THE RESPONSIBILITY
OF THE CUSTOMER OR THE CUSTOMER’S SYSTEM INTEGRATOR. ALL SPECIFICATIONS
SUPPLIED HEREIN ARE SUBJECT TO CHANGE.
COPYRIGHT
THIS DOCUMENT CONTAINS PROPRIETARY TECHNICAL INFORMATION WHICH IS THE PROPERTY
OF SIMCOM WIRELESS SOLUTIONS LIMITED COPYING, TO OTHERS AND USING THIS DOCUMENT,
ARE FORBIDDEN WITHOUT EXPRESS AUTHORITY BY SIMCOM. OFFENDERS ARE LIABLE TO THE
PAYMENT OF INDEMNIFICATIONS. ALL RIGHTS RESERVED BY SIMCOM IN THE PROPRIETARY
TECHNICAL INFORMATION ，INCLUDING BUT NOT LIMITED TO REGISTRATION GRANTING OF A
PATENT , A UTILITY MODEL OR DESIGN. ALL SPECIFICATION SUPPLIED HEREIN ARE SUBJECT TO
CHANGE WITHOUT NOTICE AT ANY TIME.
SIMCom Wireless Solutions Limited
Building B, SIM Technology Building, No.633 Jinzhong Road, Changning District, Shanghai P.R. China
Tel: +86 21 31575100
Email: simcom@simcom.com
For more information, please visit:
https://www.simcom.com/download/list-863-en.html
For technical support, or to report documentation errors, please visit:
https://www.simcom.com/ask/ or email to: support@simcom.com
Copyright © 2020 SIMCom Wireless Solutions Limited All Rights Reserved.
www.simcom.com 2 / 9
SIM800 Series_PCM_Application Note_V1.02
About Document
Version History
Version Date
1.00
1.01
1.02
2013-10-18
2016-11-17
2020-06-15
Scope
Owner
Yong.Lu
Yong.Lu
Yizhe.Tan
/Wenjie.Lai
What is new
New version
Scope
All
This document presents the AT command of PCM operation and application examples. This document can
apply to SIM800 series modules with PCM function.
www.simcom.com 3 / 9
SIM800 Series_PCM_Application Note_V1.02
Contents
About Document .................................................................................................................... 3
Version History ...................................................................................................................................... 3
Scope .................................................................................................................................................... 3
Contents ................................................................................................................................. 4
Introduction ...................................................................................................................... 5
1
1.1 Purpose of the document ............................................................................................................ 5
1.2 Related documents ..................................................................................................................... 5
1.3 Conventions and abbreviations ................................................................................................... 5
2 AT Commands .................................................................................................................. 6
2.1 AT+CHFA Swap the Audio Channels ........................................................................................ 6
2.2 AT+CPCMCFG Set PCM Parameter ........................................................................................ 7
2.3 AT+CPCMSYNC Set PCM Sync Parameter............................................................................. 7
3 PCM Examples ................................................................................................................. 9
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SIM800 Series_PCM_Application Note_V1.02
1 Introduction
1.1 Purpose of the document
Based on module AT command manual, this document will introduce PCM application process.
Developers could understand and develop application quickly and efficiently based on this document.
1.2 Related documents
[1] SIM800 Series_AT Command Manual
1.3 Conventions and abbreviations
Abbreviations
PCM
MSB
LSB
Description
Pulse-Code Modulation
Most Significant Bit
Least Significant Bit
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SIM800 Series_PCM_Application Note_V1.02
2 AT Commands
SIM800 series PCM AT command overview.
AT Command
AT+CHFA
AT+CPCMCFG
AT+CPCMSYNC
Description
Swap the audio channels
Set PCM parameter
Set PCM Sync parameter
2.1 AT+CHFA Swap the Audio Channels
AT+CHFA Swap the Audio Channels
Test Command
AT+CHFA=?
Read Command
AT+CHFA?
Write Command
AT+CHFA=
Response
+CHFA: (0=NORMAL_AUDIO,
1=AUX_AUDIO,2=HANDFREE_AUDIO,3=AUX_HANDFREE_AUDI
O, 4=PCM_AUDIO)
OK
Response
+CHFA:
OK
Parameter
See Write Command
Response
OK
If error is related to ME functionality:
+CME ERROR:
Parameter
0 Main audio channel
1 Aux audio channel
2 Main audio channel hand free mode
3 Aux audio channel hand free mode
4 PCM channel
Reference
Note
must equal to 4 when using PCM function.
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SIM800 Series_PCM_Application Note_V1.02
2.2 AT+CPCMCFG Set PCM Parameter
Read Command
AT+CPCMCFG?
AT+CPCMCFG Set PCM Parameter
Response
Test Command
AT+CPCMCFG =?
+CPCMCFG: (0-1)
OK
Parameter
See Write Command
Response
+CPCMCFG:
OK
Parameter
See Write Command
Response
OK
ERROR
Parameter
0 MSB
1 LSB
Write Command
AT+CPCMCFG=
Reference
Note
2.3 AT+CPCMSYNC Set PCM Sync Parameter
AT+CPCMSYNC Set PCM Sync Parameter
Test Command
AT+CPCMSYNC =?
Response
+CPCMSYNC: (0-1),(1-8)
OK
Parameter
See Write Command
Response
+CPCMSYNC: ,
OK
Parameter
Read Command
AT+CPCMSYNC?
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SIM800 Series_PCM_Application Note_V1.02
Write Command
AT+CPCMSYNC=,
See Write Command
Response
OK
ERROR
Parameter
0 PCM short sync
1 PCM long sync
Reference
1-8 PCM sync length(1-8)
Note
The is only supported 1 when PCM sync is short sync.
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