UC20TCPIP模块AT命令手册：TCP/IP堆栈与AT指令互联网接入

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Quectel UC20是一款集成了TCP/IP栈的模块，它允许用户通过AT命令直接访问互联网，从而降低了对PPP和TCP/IP协议栈的依赖，显著降低了设备成本。这款模块提供了一系列的socket服务，包括TCP客户端、UDP客户端、TCP服务器以及UDP服务。这使得开发者能够利用简单易用的AT指令进行网络通信，无需深入理解复杂的底层协议细节。 AT命令是模块与外部主机进行交互的关键手段，它们是基于文本的控制命令，适用于远程设备管理和网络配置。UC20 TCPIP AT命令手册（V1.2）提供了详细的指南，包括但不限于设置网络参数（如IP地址、子网掩码、默认网关）、连接和断开网络连接、发送和接收数据包等操作。此外，手册还包含了关于如何使用这些命令进行端口转发、设置超时、错误处理等内容，以确保高效和可靠的网络通信。该文档的发布日期为2014年9月28日，由Quectel Wireless Solutions Co., Ltd.维护，强调了及时和全面的服务承诺，并提供了公司的联系方式，以便客户在遇到问题时寻求帮助。同时，手册声明所提供的信息仅供参考，虽然经过努力确保其准确性，但不保证信息的绝对正确性，也不承担因使用手册内容导致的任何损失或损害的责任。 Quectel UC20 TCPIP AT命令手册对于开发人员来说是一份宝贵的资源，它简化了在移动通信模块上实现TCP/IP功能的过程，提升了设备的灵活性和部署效率。理解和掌握这些AT命令，可以帮助开发者快速构建物联网应用，实现设备间的无缝通信。

UMTS/HSPA Module Series

UC20 TCPIP AT Commands Manual

UC20_TCPIP_AT_Commands_Manual Confidential / Released 6 / 36

Power on the module

Query SIM card

status by AT+CPIN?

Query SIM Card Status:

Execute AT+CPIN/AT+QINISTAT,

reboot the module if AT+CPIN? failed

to find SIM card in 20s.

Recommended Power on/off:

1. Power off: Send AT command

AT+QPOWD=1, then cut off power

after 12s.

2. Power on: Keep power key as low for

2s, then pull to high.

Query CS service

by AT+CREG?

CS Service：

1. <stat> of AT+CREG? equals to 1 or 5,

means the module has registered to CS

domain service.

2. Reboot the module if failed to register

to CS domain service in 90s.

Activate PDP context by

AT+QIACT=<contextID>

and AT+QIACT?

Activate PDP Context:

1. Activate PDP context by

AT+QIACT=<contextID>.

2. Query IP address of PDP context

by AT+QIACT?.

Notes:

a) All above commands should be

executed together in sequence.

b) Reboot the module if there is no

response for AT+QIACT in 150s.

c) If failed to deactivate PDP

context for 3 times, then reboot the

module.

3. Deactivate PDP context:

Reboot the module if there is no

response for AT+QIDEACT in 40s.

Open connection

by AT+QIOPEN

Send data by

AT+QISEND=<connectID>

Query sending

ACK by AT+QISEND=

<connectID>,0

Close connection

by AT+QICLOSE=

Deactivate

PDP context by

AT+QIDEACT=

If failed to register to CS

domain service in 90s,

then reboot the module.

Find SIM card

Succeed to activate PDP context

Reboot the module if there is

no response in 10s.

+QIOPEN: <connectID>,<err>

Get ACK

in 90s

PS Service：

1. <stat> of AT+CGREG? equales to 1 or

5, means the module has registered to PS

domain service.

2. Go to next step no matter register to PS

domain service or not in 60s.

If failed to find SIM card in

20s, then reboot the module.

1. Reboot the module if

there is no response in 150s.

2. If failed to deactivate

PDP context for 3 times,

then reboot the module.

Notes:

1. Please note that you need to wait for the final response (for example OK, CME error, CMS error) of the last AT command you entered before

you enter the next AT command. You can reboot the module if the module failed to get response in 60s.

2. Reboot the module if the module has not got response of AT+QIACT in 150s or response of AT+QICLOSE in 10s and AT+QIDEACT in 40s .

3. When you constantly failed to restart for 3 times, you can restart immediately for the first time after that, if it still fails, you should restart after

10 minutes for the second time, and restart after 30 minutes for the third time, 1 hour for the fourth time, etc..

Query PS service in 60s by

AT+CGREG?

Fail to activate

PDP context

1. Fail to open connection

continuously for 5 times.

2. There is no response in 150s.

Fail to get ACK in 90s

Succeed to

deactivate

PDP

context

Reboot the

module if

there is no

response in

40s.

Open Connection：

1. If failed to get response of AT+QIOPEN in 150s, then

close connection.

2. If failed to open connection for 5 times, deactivate PDP

context, then re-activate PDP context and open connection

again.

Send AT command and wait for the module to response OK

TCP Connection Maintenance and Detection:

1. Send data by AT+QISEND =<connectID>[,<send_length>].

It is recommended to periodically send a small data packet to the remote

end to maintian and detect the TCP connection.

2. Query sending ACK by AT+QISEND=<connectID>.

If the package is still not acknowledged after two minutes (query every 5

seconds, 24 times in total), the TCP connection may be abnormal,

execute AT+QICLOSE to close the current connection, and then execute

AT+QIOPEN to re-establish the TCP connection.

Configure PDP context and Qos by

AT+QICSGP/AT+CGQREQ/

AT+CGEQREQ/AT+CGQMIN/

AT+CGEQMIN

Configure PDP Context:

1. Configure APN, user name, password

and auth type by AT+QICSGP.

2. Configure QoS settings by

AT+CGQMIN/AT+CGEQMIN/

AT+CGQREQ/AT+CGEQREQ.

Figure 1: Flow Chart of Using TCPIP AT Commands

Quectel

Confidential

UMTS/HSPA Module Series

UC20 TCPIP AT Commands Manual

UC20_TCPIP_AT_Commands_Manual Confidential / Released 7 / 36

1.2. Description of Data Access Mode

The TCPIP AT commands of the module include three kinds of data access modes:

1. Buffer access mode

2. Direct push access mode

3. Transparent access mode

When opening a socket service via AT+QIOPEN, specify the data access mode by the parameter

<access_mode>. After a socket service is opened, AT+QISWTMD could be used to change the data

access mode.

1. In buffer access mode, send data by AT+QISEND. When the data has been received, the module will

buffer the data and report an URC as +QIURC: “recv”,<connectID>. Then host can read data by

AT+QIRD. Note: If the buffer is not empty, the module will not report a new URC until all the received

data has been read by AT+QIRD from buffer.

2. In direct push mode, send data by AT+QISEND. The received data will be outputted to COM port

directly by +QIURC: “recv”,<connectID>,<currectrecvlength><CR><LF><data>.

3. In transparent access mode, the corresponding port (such as UART, USB modem port, etc.) enters

into the exclusive mode (Note that the USB AT port does not support transparent access mode). The

data received from COM port will be sent to Internet directly, and the received data from Internet will

be output to COM port directly as well. “+++” is used to exit from transparent access mode. When

“+++” returns OK, the module will be switched to buffer access mode. AT+QISWTMD can be used to

return back to transparent access mode. Note: In transparent access mode, host cannot execute AT

command. If the socket connection is closed because of network error or else, the module will report

NO CARRIER and exit from the transparent access mode. In this case, AT+QICLOSE should be

executed to close socket service.

4. To exit from the transparent access mode, use “+++” or DTR (AT&D1 should be set). To prevent the

“+++” from being misinterpreted as data, it should comply to the following sequence:

1) Do not input any character within T1 time (1 second) before inputting “+++”.

2) Input “+++” during 1s, and no other characters can be inputted during this time.

3) Do not input any character within T1 time (1 second) after “+++” has been inputted.

4) Exit from transparent access mode, return OK.

5. There are two methods to return back to the transparent access mode:

1) By AT+QISWTMD. Specify the <access mode> as 2. If it enters into transparent access mode

successfully, CONNECT will be returned.

2) By ATO. ATO will change the access mode of connection that exits from transparent access mode

lately. If it enters into transparent access mode successfully, CONNECT will be returned. If there is

no connection enters into transparent access mode before, ATO will return NO CARRIER.

Quectel

Confidential

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