如何在codesys中调用"at命令"?对于GSM调制解调器?不是标准的send_sms和e.t.c [英] How in codesys call an "at command" for gsm modem? Not standart send_sms and e.t.c

问题描述

我有一个gsm-modem和plc，plc看到一个调制解调器(我使用* .lib和功能块"openPort")，但是例如，我不了解如何在调制解调器中写入"at命令"， "ate0".

I have a gsm-modem and plc, plc sees a modem (I use a *.lib and functional block "openPort"), but I don't understand how write in modem an "at command", 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或类似内容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(您也可以将< ST-Ericsson的U300 RIL 中的c3>和isFinalResponseSuccess，尽管请注意CONNECT不是最终结果代码，但它是中间结果代码，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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