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Serial communication-use php_dio.dll to connect to the gsm module through the serial port and send a text message. the mobile phone number of China Telecom cannot receive the text message.

Source: Internet
Author: User
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The following problems exist: 1. after the device is connected, you must use software such as the serial port assistant to open the serial port and disable the software before using php to send the at command for reading the serial port. Otherwise, the device will be suspended, why? 2. Why can't I receive text messages from telecom phone numbers? Serial Port communication php serial port gsm module

The problem is as follows:
1. after the device is connected, you must use software such as the serial port assistant to open the serial port and disable the software before using php to send the at command for reading the serial port. Otherwise, it will be suspended. why?
2. Why can't I receive text messages from telecom phone numbers?

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