When controlling GSM devices using AT commands, the device can respond with either "OK" or "ERROR".当使用AT命令控制GSM设备，该设备可以与“确定”或“错误”的回应。 Sometimes you will receive an error and you do not know the cause of this error.有时你会收到一个错误，你不知道这个错误的原因。
That's why most advanced GSM devices support extended errors.这就是为什么最先进的GSM设备支持扩展的错误。 Instead of just displaying the "ERROR" message, it also shows an error number.而不是仅仅显示“错误”讯息，它也显示了一个错误号。 The syntax of this extended error is either "+CMS ERROR: xxx" or "+CME ERROR: xxx".这个扩展的语法错误，要么是“+ CMS ERROR：XXX”或“+ CME ERROR：XXX”。
When the error starts with "+CME ERROR", it means that the error is a device specific error code.当错误“+ CME ERROR”开始，就意味着该错误是一个设备特定的错误代码。 For instance, you are trying to read a phonebook entry before entering a pincode.例如，你正在试图进入一个PIN代码前阅读电话簿条目。
When there is a network error, for instance, when you try to send an SMS message when there is no network coverage, you will receive an error which starts with "+CMS ERROR".当有网络错误，例如，当您尝试发送短信时有没有网络覆盖，您将收到一个错误，用“+ CMS ERROR”的开始。
To enable these extended commands, execute the following commands, or add them to your modems init string:为了使这些扩展命令，执行以下命令，或将它们添加到您的调制解调器初始化字符串：
AT+CMEE=1 AT + CMEE = 1
AT&W AT＆W
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