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EC20 AT指令集是针对Quectel EC20 4G网络模块的一份重要的技术文档，该手册详细列出了所有用于控制和配置EC20模块的AT命令。AT（Attention）指令是一种标准的串行通信协议，常用于调制解调器和其他通信设备的配置。在开发基于EC20的无线通信应用时，理解并熟练运用这些AT指令至关重要。 EC20模块是Quectel公司生产的一款支持LTE网络的模块，适用于高速数据传输、物联网(IoT)和机器对机器(M2M)通信。它具有广泛的频段覆盖，可以接入多种4G网络，为各种应用提供可靠的数据连接。此手册版本为EC20_R2.1_AT_Commands_Manual_V1.0，发布日期为2017年11月14日，已被正式发布，意味着其内容已经过Quectel公司的验证和确认。手册包含了EC20模块的基本操作、网络注册、数据连接管理、IP服务、短信服务、电话功能、诊断和测试等多个方面的AT指令。例如，`AT+CGATT`指令用于激活或去激活PDP上下文，`AT+CMGS`用于发送SMS消息，而`AT+CREG`则用来检查网络注册状态。每个指令都有详细的语法、参数、返回值和可能的错误代码，有助于开发者准确理解和使用。 Quectel公司强调，他们提供的信息是为了服务客户，但不提供任何保证，也不承担因使用或依赖这些信息导致的任何伤害、损失或损害的责任。所有的信息都可能在未经事先通知的情况下进行更改。此外，手册的版权属于Quectel Wireless Solutions Co., Ltd.，未经授权的复制、传播、编辑以及内容利用都是被禁止的，并可能需要赔偿损失。在实际开发过程中，开发者不仅需要了解每个AT指令的功能，还需要理解如何根据具体的应用场景来组合和调用这些指令。例如，在初始化模块、设置APN、建立TCP/UDP连接、处理数据传输和断开连接等场景下，正确使用AT指令是实现可靠通信的关键。为了获取技术支持或报告文档错误，开发者可以通过访问Quectel公司的官方网站或直接联系他们的技术支持邮箱来获取帮助。这表明Quectel公司提供了完善的售后和技术支持服务，以确保用户能够顺利地使用EC20模块。 EC20 AT指令集是开发EC20 4G模块应用的重要参考资料，涵盖了模块的所有核心功能，需要开发者深入学习和实践，以便在项目中灵活运用。通过理解和掌握这些指令，开发者可以构建高效、稳定且适应性强的无线通信解决方案。

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EC20 R2.1

AT Commands Manual

LTE Module Series

Rev. EC20_R2.1_AT_Commands_Manual_V1.0

Date: 2017-11-14

Status: Released

www.quectel.com

LTE Module Series

EC20 R2.1 AT Commands Manual

EC20_R2.1_AT_Commands_Manual 1 / 241

Our aim is to provide customers with timely and comprehensive service. For any

assistance, please contact our company headquarters:

Quectel Wireless Solutions Co., Ltd.

Floor, Hongye Building, No.1801 Hongmei Road, Xuhui District, Shanghai 200233, China

Tel: +86 21 5108 6236

Email: info@quectel.com

Or our local office. For more information, please visit:

http://quectel.com/support/sales.htm

For technical support, or to report documentation errors, please visit:

http://quectel.com/support/technical.htm

Or email to: support@quectel.com

GENERAL NOTES

QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION

PROVIDED IS BASED UPON CUSTOMERS‟ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT

TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT

MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT

ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR

RELIANCE UPON THE INFORMATION. ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO

CHANGE WITHOUT PRIOR NOTICE.

THE INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF

QUECTEL WIRELESS SOLUTIONS CO., LTD. TRANSMITTING, REPRODUCTION, DISSEMINATION

AND EDITING OF THIS DOCUMENT AS WELL AS UTILIZATION OF THE CONTENT ARE

FORBIDDEN WITHOUT PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF

DAMAGES. ALL RIGHTS ARE RESERVED IN THE EVENT OF A PATENT GRANT OR

REGISTRATION OF A UTILITY MODEL OR DESIGN.

LTE Module Series

EC20 R2.1 AT Commands Manual

EC20_R2.1_AT_Commands_Manual 3 / 241

Contents

About the Document ................................................................................................................................... 2

Contents ....................................................................................................................................................... 3

Table Index ................................................................................................................................................... 8

1 Introduction .......................................................................................................................................... 9

1.1. Scope of the Document ............................................................................................................. 9

1.2. AT Command Syntax ................................................................................................................. 9

1.3. Supported Character Sets ....................................................................................................... 10

1.4. AT Command Interface ............................................................................................................ 10

1.5. Unsolicited Result Code .......................................................................................................... 10

1.6. Turn off Procedure ................................................................................................................... 11

2 General Commands ........................................................................................................................... 12

2.1. ATI Display Product Identification Information ...................................................................... 12

2.2. AT+GMI Request Manufacturer Identification ...................................................................... 13

2.3. AT+GMM Request TA Model Identification ........................................................................... 13

2.4. AT+GMR Request TA Revision Identification of Software Release ..................................... 14

2.5. AT+CGMI Request Manufacturer Identification .................................................................... 14

2.6. AT+CGMM Request Model Identification ............................................................................. 15

2.7. AT+CGMR Request TA Revision Identification of Software Release ................................... 15

2.8. AT+GSN Request International Mobile Equipment Identity (IMEI) ...................................... 16

2.9. AT+CGSN Request Product Serial Number Identification ................................................... 17

2.10. AT&F Set all Current Parameters to Manufacturer Defaults ................................................ 17

2.11. AT&V Display Current Configuration .................................................................................... 18

2.12. AT&W Store Current Parameters to User Defined Profile .................................................... 19

2.13. ATZ Set all Current Parameters to User Defined Profile ...................................................... 19

2.14. ATQ Set Result Code Presentation Mode ............................................................................ 20

2.15. ATV TA Response Format .................................................................................................... 20

2.16. ATE Set Command Echo Mode ............................................................................................ 22

2.17. A/ Repeat Previous Command Line ..................................................................................... 22

2.18. ATS3 Set Command Line Termination Character ................................................................. 23

2.19. ATS4 Set Response Formatting Character .......................................................................... 24

2.20. ATS5 Set Command Line Editing Character ........................................................................ 24

2.21. ATX Set CONNECT Result Code Format and Monitor Call Progress ................................. 25

2.22. AT+CFUN Set Phone Functionality ...................................................................................... 26

2.23. AT+CMEE Error Message Format ........................................................................................ 27

2.24. AT+CSCS Select TE Character Set ...................................................................................... 28

2.25. AT+QURCCFG Configure URC Indication Option ............................................................... 29

3 Serial Interface Control Commands ................................................................................................ 31

3.1. AT&C Set DCD Function Mode ............................................................................................ 31

3.2. AT&D Set DTR Function Mode ............................................................................................. 31

3.3. AT+IFC Set TE-TA Local Data Flow Control ......................................................................... 32

LTE Module Series

EC20 R2.1 AT Commands Manual

EC20_R2.1_AT_Commands_Manual 4 / 241

3.4. AT+ICF Set TE-TA Control Character Framing .................................................................... 33

3.5. AT+IPR Set TE-TA Fixed Local Rate .................................................................................... 34

3.6. AT+QRIR Restore RI Behavior to Inactive ........................................................................... 35

4 Status Control Commands ............................................................................................................... 36

4.1. AT+CPAS Mobile Equipment Activity Status ......................................................................... 36

4.2. AT+CEER Extended Error Report ........................................................................................ 37

4.3. AT+QCFG Extended Configuration Settings ........................................................................ 38

4.3.1. AT+QCFG="gprsattach" GPRS Attach Mode Configuration ....................................... 39

4.3.2. AT+QCFG="nwscanmode" Network Search Mode Configuration.............................. 40

4.3.3. AT+QCFG="nwscanseq" Network Searching Sequence Configuration ..................... 41

4.3.4. AT+QCFG="roamservice" Roam Service Configuration ............................................ 42

4.3.5. AT+QCFG="servicedomain" Service Domain Configuration ...................................... 42

4.3.6. AT+QCFG="band" Band Configuration ...................................................................... 43

4.3.7. AT+QCFG="hsdpacat" HSDPA Category Configuration............................................. 45

4.3.8. AT+QCFG="hsupacat" HSUPA Category Configuration ............................................ 45

4.3.9. AT+QCFG="rrc" RRC Release Version Configuration ............................................... 46

4.3.10. AT+QCFG="sgsn" UE SGSN Release Version Configuration ................................... 47

4.3.11. AT+QCFG="msc" UE MSC Release Version Configuration ....................................... 47

4.3.12. AT+QCFG="PDP/duplicatechk" Establish Multi PDNs with the Same APN ............... 48

4.3.13. AT+QCFG="tdscsq" Set TD-SCDMA RSSI Range ..................................................... 49

4.3.14. AT+QCFG="urc/ri/ring" RI Behavior When RING URC is Presented ......................... 49

4.3.15. AT+QCFG="urc/ri/smsincoming" RI Behavior When Incoming SMS URCs are

Presented ...................................................................................................................................... 51

4.3.16. AT+QCFG="urc/ri/other" RI Behavior When Other URCs are Presented .................. 52

4.3.17. AT+QCFG="risignaltype" RI Signal Output Carrier .................................................... 53

4.3.18. AT+QCFG="urc/delay" Delay URC Indication ............................................................ 54

4.3.19. AT+QCFG="urc/cache" URC Cache Function ............................................................ 54

4.3.20. AT+QCFG=" tone/incoming" Ring Tone Function ....................................................... 56

4.4. AT+QINDCFG URC Indication Configuration ....................................................................... 57

5 (U)SIM Related Commands ............................................................................................................... 59

5.1. AT+CIMI Request International Mobile Subscriber Identity (IMSI) ....................................... 59

5.2. AT+CLCK Facility Lock ......................................................................................................... 60

5.3. AT+CPIN Enter PIN .............................................................................................................. 62

5.4. AT+CPWD Change Password .............................................................................................. 64

5.5. AT+CSIM Generic (U)SIM Access ........................................................................................ 65

5.6. AT+CRSM Restricted (U)SIM Access ................................................................................... 66

5.7. AT+QCCID Show ICCID ....................................................................................................... 67

5.8. AT+QPINC Display PIN Remainder Counter........................................................................ 68

5.9. AT+QINISTAT Query Initialization Status of (U)SIM Card .................................................... 69

5.10. AT+QSIMDET (U)SIM Card Detection.................................................................................. 69

5.11. AT+QSIMSTAT (U)SIM Card Insertion Status Report .......................................................... 70

6 Network Service Commands ............................................................................................................ 73

6.1. AT+COPS Operator Selection .............................................................................................. 73

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