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POC++ Serial Port Question
 

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    <p><strong>Problem</strong>: I have a hand held device that scans those graphic color barcodes on all packaging. There is a track device that I can use that will slide the device automatically. This track device functions by taking ascii code through a serial port. I need to get this thing to work in FileMaker on a Mac. So no terminal programs, etc...</p> <p><strong>What I've got so far</strong>: I bought a Keyspan USB/Serial adapter. Using a program called ZTerm I was successful in sending commands to the device. Example: "C,7^M^J"</p> <p>I was also able to do the same thing in Terminal using this command: screen /dev/tty.KeySerial1 57600 and then type in the same command above(but when I typed in I just hit Control-M and Control-J for the carriage return and line feed)</p> <p>Now I'm writing a plug-in for FileMaker(in C++ of course). I want to get what I did above happen in C++ so when I install that plug-in in FileMaker I can just call one of those functions and have the whole process take place right there.</p> <p>I'm able to connect to the device, but I can't talk to it. It is not responding to anything.</p> <p>I've tried connecting to the device(successfully) using these:</p> <pre><code>FILE *comport; if ((comport = fopen("/dev/tty.KeySerial1", "w")) == NULL){...} </code></pre> <p>and</p> <pre><code>int fd; fd = open("/dev/tty.KeySerial1", O_RDWR | O_NOCTTY | O_NDELAY); </code></pre> <p>This is what I've tried so far in way of talking to the device:</p> <pre><code>fputs ("C,7^M^J",comport); </code></pre> <p><em>or</em></p> <pre><code>fprintf(comport,"C,7^M^J"); </code></pre> <p><em>or</em></p> <pre><code>char buffer[] = { 'C' , ',' , '7' , '^' , 'M' , '^' , 'J' }; fwrite (buffer , 1 , sizeof(buffer) , comport ); </code></pre> <p><em>or</em></p> <pre><code>fwrite('C,7^M^J', 1, 1, comport); </code></pre> <p><strong>Questions</strong>: When I connected to the device from Terminal and using ZTerm, I was able to set my baud rate of 57600. I think that may be why it isn't responding here. But I don't know how to do it here.... Does any one know how to do that? I tried this, but it didn't work:</p> <pre><code>comport-&gt;BaudRate = 57600; </code></pre> <p>There are a lot of class solutions out there but they all call these include files like termios.h and stdio.h. I don't have these and, for whatever reason, I can't find them to download. I've downloaded a few examples but there are like 20 files in them and they're all calling other files I can't find(like the ones listed above). Do I need to find these and if so where? I just don't know enough about C++ Is there a website where I can download libraries??</p> <p>Another solution might be to put those terminal commands in C++. Is there a way to do that?</p> <p>So this has been driving me crazy. I'm not a C++ guy, I only know basic programming concepts. Is anyone out there a C++ expert? I ideally I'd like this to just work using functions I already have, like those fwrite, fputs stuff. Thanks!</p>
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