如何调用"AT命令"?在Codesys中使用GSM调制解调器?不是标准的send_sms等 [英] How can I call an "AT command" in Codesys for a GSM modem? Not standard send_sms, etc

问题描述

我有一个GSM调制解调器和一个PLC.PLC看到调制解调器(我使用* .lib和功能块"openPort")，但是我不明白如何发送"AT命令".到调制解调器，例如"ate0&".

I have a GSM modem and a PLC. The PLC sees a modem (I use a *.lib and functional block "openPort"), but I don't understand how send an "AT command" to the modem, for example, "ate0".

推荐答案

首先，要全面了解AT命令，请阅读V.

First, to increase your understanding of AT commands in general, read the V.250 specification. That will go a long way in making you an AT command expert.

然后对于实际的实现，我不知道Codesys，因此以下是处理AT命令应具有的结构的伪代码:

Then for the actual implementation, I do not know Codesys, so the following is pseudo code of the structure you should have for handling AT commands:

the_modem = openPort();
...
// Start sending ATE0
writePort(the_modem, "ATE0\r");
do {
    line = readLinePort(the_modem);
} while (! is_final_result_code(line))
// Sending of ATE0 command finished (successfully or not)
...
closePort(the_modem);

无论您做什么，都永远不要使用 delay ， sleep 或类似方法代替等待最终结果代码.您可以查看 atinout 的代码，以获取 is_final_result_code 函数的示例(您还可以在isFinalResponseError 和 isFinalResponseSuccess 进行比较.rel ="nofollow noreferrer"> ST-Ericsson的U300 RIL ，尽管请注意 CONNECT 不是最终结果代码，它是中间结果代码，因此名称isFinalResponseSuccess并非100％正确).

Whatever you do, never, never use delay, sleep or similar as a substitute for waiting for the final result code. You can look at the code for atinout for an example for the is_final_result_code function (you can also compare to isFinalResponseError and isFinalResponseSuccess in ST-Ericsson's U300 RIL, although note that CONNECT is not a final result code. It is an intermediate result code, so the name isFinalResponseSuccess is not 100% correct).

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