I want to transfer a number from java program which is on laptop (means there is no rs232 protocol pin is provided) to a pic microcontroller(where essentially I have to used rs232) .Therefore here I require usb /rsr232 converter. Which Java library should I use ? Will it work with javax.comm library?
Can I use javax.comm library when usb/rs232 converter is used?
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The answer is it depends on the USB/RS232 converter you are using. Most that I have used will expose the serial port as a virtual com port device on your operating system (see page 8 of this PDF document). If that's the case,
javax.commwill work fine. If not, you will have to use a proprietary API for the hardware which should be provided by the manufacturer. If you have hardware like this, I would strongly recommend replacing it with a class-compatible USB device.