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    <p>You don't specify which Unix you are using, so below I'm posting some Linux production code I use.</p> <p>Pleae note below code is a class method so ignore any external (ie undeclared) references.</p> <p>Steps are as follows - </p> <p>Configure your termio structure, this is where you set any needed flags etc (ie the step you accomplished using zterm. The termio settings below configure the port to 8 databits, 1 stopbit and no parity (8-n-1). Also the port will be in "raw" (as opposed to cooked) mode so its a character stream, text isn't framed into lines etc The baud constants match the actual value, ie for 56700 baud you use "57600".</p> <p>The timing parameters mean that characters are returned from the device as soon as they are available.</p> <p>Once you have your termainal parameters set, you open the device (using POSIX open()), and then can use tcgetattr/tcsetattr to configure the device via the fd.</p> <p>At this point you can read/write to the device using the read()/write() system calls. </p> <p>Note that in the below example read() will block if no data is available so you may want to use select()/poll() if blocking is undesirable.</p> <p>Hope that helps.</p> <pre><code>termios termio tcflag_t baud_specifier; //reset device state... memset (&amp;termio, 0, sizeof (termios)); read_buffer.clear(); //get our boad rate... if (!(baud_specifier = baud_constant (baud))) { ostringstream txt; txt &lt;&lt; "invalid baud - " &lt;&lt; baud; device_status_msg = txt.str(); status = false; return (true); } //configure device state... termio.c_cflag = baud_specifier | CS8 | CLOCAL | CREAD; //do we want handshaking? if (rtscts) { termio.c_cflag |= CRTSCTS; } termio.c_iflag = IGNPAR; termio.c_oflag = 0; termio.c_lflag = 0; //com port timing, no wait between characters and read unblocks as soon as there is a character termio.c_cc[VTIME] = 0; termio.c_cc[VMIN] = 0; //open device... if ((fd = open (device.c_str(), O_RDWR | O_NOCTTY)) == -1) { ostringstream txt; txt &lt;&lt; "open(\"" &lt;&lt; device &lt;&lt; "\") failed with " &lt;&lt; errno &lt;&lt; " - " &lt;&lt; std_error_msg (errno); device_status_msg = txt.str(); status = false; return (true); } //keep a copy of curret device state... if (tcgetattr (fd, &amp;old_termio) == -1) { ostringstream txt; txt &lt;&lt; "tcgetattr() failed with " &lt;&lt; errno &lt;&lt; " - " &lt;&lt; std_error_msg (errno); device_status_msg = txt.str(); status = false; return (true); } //flush any unwanted bytes if (tcflush (fd, TCIOFLUSH) == -1) { ostringstream txt; txt &lt;&lt; "tcflush() failed with " &lt;&lt; errno &lt;&lt; " - " &lt;&lt; std_error_msg (errno); device_status_msg = txt.str(); status = false; return (true); } //apply our device config... if (tcsetattr (fd, TCSANOW, &amp;termio) == -1) { ostringstream txt; txt &lt;&lt; "tcsetattr() failed with " &lt;&lt; errno &lt;&lt; " - " &lt;&lt; std_error_msg (errno); device_status_msg = txt.str(); status = false; return (true); } node_log_f ("successfully initialised device %s at %i baud", "open_device()", device.c_str(), baud); status = true; return (true); } </code></pre>
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