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    <p>OK, sorry it's taken me so long to come back to this question. Here's how I got things working.</p> <p><strong>Note: This method will <em>NOT</em> work for everyone, please read below before copy/pasting into your own code</strong></p> <pre><code>public void connect(CommPortIdentifier portId) throws Failure { if (portId == null) throw new Failure("No port set"); try { port = (SerialPort) portId.open(getClass().getName(), 10000); } catch (PortInUseException e) { throw new Failure("Port in use by " + e.currentOwner,e); } try { port.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); port.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN | SerialPort.FLOWCONTROL_RTSCTS_OUT); } catch (UnsupportedCommOperationException e) { throw new Failure(e); } port.setRTS(true); // More setup } </code></pre> <p>So, in my case, the problem was that my particular device requires RTS flow control. Other devices may require different things (CTS, XON/XOFF), so check that device's manual. By default, RXTX disables all flow control mechanisms (unlike Hypertrm or other programs). Enabling each one is a two-step process.</p> <ol> <li>Once you have a SerialPort object, call the <code>setFlowControlMode()</code> method, and bitwise-OR ('<code>|</code>') the necessary <code>SerialPort.FLOWCONTROL_</code> constants</li> <li>Set the appropriate flow control to true or false (like I did with <code>port.setRTS(true)</code>)</li> </ol> <p>For the others with similar problems, if this doesn't work, I suggest</p> <ol> <li>Using a serial port monitoring program like <a href="http://www.serial-port-monitor.com/" rel="noreferrer">Serial Port Monitor</a> and/or <a href="http://technet.microsoft.com/en-us/sysinternals/bb896644.aspx" rel="noreferrer">PortMon</a> (both Windows) to see what is actually going on.</li> <li>Emailing the RXTX developers at rxtx@qbang.org (they are very helpful)</li> </ol>
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    1. COwould you please post the flow control you used? thanks in advance...
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    2. COHopefully this edit helps
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    3. CO@drhorrible I see how you set flowcontrol on your serialport object. That is clear. However I am trying to figure out how you detect that flow control character has been sent? I am using XON XOFF vs RTS like you were. However I assume that it should be similar. 0x13,0x11 are the characters I would expect to see in the serialEvent that fires? How were you able to detect this in code?
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