Serial Communication in Java

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Serial Communication
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enableReceiveThreshold
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A receive threshold value can be set by invoking the method on a SerialPort object
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public void enableReceiveThreshold(int thresh) throws UnsupportedCommOperationException public void disableReceiveThreshold()
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The thresh parameter passed to enableReceiveThreshold represents a minimum number of bytes that should be returned when reading serial data Setting a threshold value will cause the serial port InputStream s read methods to block until either thresh bytes have been received or a time-out (if one has been set by enableReceiveTimeout) occurs The receive threshold can be disabled at any time, using the disableReceiveThreshold method Both enableReceiveTimeout and enableReceiveThreshold declare that an UnsupportedCommOperationException will be thrown in the event that the native serial driver doesn t support the requested functionality This exception should never be thrown on TINI from either of these methods, since all serial port drivers do in fact support receive time-outs and thresholds Using receive time-out values and receive threshold settings, an application can read serial data from the serial port s InputStream without polling the InputStream s available method to determine when data is available in the serial driver s receive buffer Since the receive buffers are of nite size, they can over ow if not serviced (unloaded) frequently enough by the application Without the use of any ow control, both sides must ensure that they can service the receive buffer before losing any data This problem can be avoided to some extent by using a large enough receive buffer to give the application plenty of time to read the data A receive buffer of a speci c size can be requested by invoking the setInputBufferSize method on a SerialPort object
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public void setInputBufferSize(int size) public int getInputBufferSize()
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The requested buffer size is passed as an integer On TINI the maximum supported input buffer size is 65535 If an invalid size is speci ed or another error, such as insuf cient memory for the new buffer occurs, the input buffer remains the same size as it was before setInputBufferSize was invoked No exception is thrown However, the actual input buffer size can be veri ed at any time using the getInputBufferSize method The combination of controlling the input buffer size and using well-chosen receive thresholds and time-out values can allow an otherwise busy application to service the serial port input buffer with little overhead An application can manually query the state of all of the hardware ow control lines that are supported by the underlying serial port
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The Java Communications API
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public public public public public public boolean boolean boolean boolean boolean boolean isCD() isRI() isDSR() isCTS() isRTS() isDTR()
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These methods return true if the signal was asserted at the exact time it was sampled by the native driver and false otherwise The comm API only allows the DTR and RTS signals to be altered by the applications This is because DTR and RTS are the only two lines that are outputs in a DTE serial port con guration, and the comm API assumes that it is implemented on data terminal equipment The state of DTR and RTS can be set using the setRTS and setDTR methods
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public void setDTR(boolean dtr) public void setRTS(boolean rts)
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Passing either method a boolean value of true asserts the signal, while a value of false de-asserts the signal An application using RTS/CTS ow control should not attempt to alter the state of RTS as it s managed by the driver We ll utilize the comm API s ability to toggle the state of data terminal ready (DTR) to reset an external modem in Section 762 On TINI, the internal serial ports (serial0 and serial1) don t support all of the hardware handshake signals We ll cover the details of TINI s serial port hardware and driver support in Section 33
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