GTM900B出现异常字符数据，啥意思呢？请求各位解释下啊
刚开始，GPRS一切通信正常，也就是可以接收、发送数据一段时间后
TCPIP关闭自动关闭链接
%IPCLOSE: 1
然后又过一段时间后发现
超级终端无法输入任何字符，所以就怀疑是USB口有问题，就重新拔插一下，然后发送
AT
返回EXT: I
ADC 0 = 10fb, ADC 1 = 0, ADC 2 = 1b, ADC 3 = c41, ADC 4 = 0, ADC 5 = 0, ADC 6 =
3d, ADC 7 = 0, ADC 8 = 2e9
OK
AT
OK
AT%IPOPEN？
ERROR: 3
AT%ETCPIP？
OK
AT%CGDCONT？指令发错了
EXT: I
ERROR
AT+CGDCONT？重新发送查询指令
OK
AT+CGDCONT=1,"IP","CMNET"
ERROR
AT+CGDCONT?
+CGDCONT: 1,"IP","CMNET","",0,0
+CGDCONT: 2,"IP",,"",0,0
OK
AT+cGDCONT?
+CGDCONT: 1,"IP","CMNET","",0,0
+CGDCONT: 2,"IP",,"",0,0
很纳闷，怎么会出现这种情况
难道是休眠引起的？
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