SIM900不能发送GPRS数据的问题

wuxianglin2000 · 发表于 2016-10-24 19:58:14

最近在用ATK-SIM900A GSM/GPRS模块短信电话开发板调试，
，但是出现了一点问题，TCP方式下，无法发送数据，我用电脑串口调试工具向SIM900A模块发送AT指令，结果如下：

AT+CSQ

+CSQ: 26,0

OK
AT+CGCLASS="B"

OK
AT+CGDCONT=1,"IP","CMNET"

OK
AT+CGATT=1

OK
AT+CIPCSGP=1,"CMNET"

OK
AT+CLPORT="TCP","3001"

OK
AT+CIPSTART="TCP","115.159.185.143","7270"

OK

STATE: TCP CLOSED

CONNECT FAIL
AT+CIPSTART="TCP","115.159.185.143","7270"

OK

CONNECT OK
AT+CIPSEND

> 123456789123456789123456789123456789
123456789
123456789
123456789
123456789

始终没有出现 SENK OK 的提示，同时在TCP服务器端也看不到数据。
请问这是怎么回事？谢谢！