使用AT指令进行拨号，可快速的集成EC20 4G模块，只需要给EC20供电和接上通信UART串口，就能实现网络连接。

EC20管脚分配

最小系统电路图

TCP/IP AT命令拨号流程

AT指令拨号流程测试

RDY

AT
OK		【OK】

AT+CPIN?
+CPIN: READY	【READY】
OK

AT+CSQ
+CSQ: 31,99	【0~31】【99 nouse】
OK

AT+CREG?	注网
+CREG: 0,1	【1 or 5】
OK

AT+CGREG?	注网
+CGREG: 0,1	【1 or 5】
OK

AT+CEREG?	EPS注网
+CEREG: 0,1	【1 or 5】
OK

AT+QICSGP=?	配置APN信息
+QICSGP: (1-16),(1-3),<APN>,<username>,<password>,(0-3),(0-1)
OK

AT+QICSGP=1	查询APN信息
+QICSGP: 1,"ctnet","","",0
OK

AT+QICSGP=1,1,"ctnet","","",1	设置APN
		ID	1-16
		type 1=ipv4,2=ipv4v6
		apn	ctnet
		username
		password
		integer type	1=pap
OK

AT+QIACT=?		设置Context通道, Activate a PDP Context
+QIACT: (1-16)
OK

AT+QIACT=1
OK

AT+QIACT?
+QIACT: 1,1,1,"10.213.110.67"
		ID 1-16
		state	1=activa
		protocol type	1=ipv4,2=ipv4v6
		ipaddr
OK

AT+QIOPEN=?		打开socket连接
+QIOPEN: (1-16),(0-11),"TCP/UDP/TCP LISTENER/UDP SERVICE","<IP_address>/<domain_name>",<remote_port>,<local_port>,(0-2)
OK

AT+QIOPEN=<contextID>,<connectID>,<service_type>,<IP_address>/<domain_name>,<remote_port>[,<local_port>[,<access_mode>]]

AT+QIOPEN=1,0,"TCP","125.69.102.153",7792
OK

+QIOPEN: 0,0

3种数据传输模式

Buffer模式，Push模式，透传模式。通过参数<access_mode>进行配置。

 

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