In the following example a Keyspan serial adaptor is listed and tested by touching an attached touch screen:
To test if a com port is working and receiving data type 'cat < /dev/' in a Terminal program (Finder, Go, Utilities, Terminal) and use the serial device. The best way to test this is the case is to use an external process to prove the above is true before specifying the port name in the UPDD driver.įor a quick test of a RS232 port open up a terminal / command window, type the command shown and touch the screen: OSĬat < /dev/ttySN' (or ttyUSBn if using a serial to usb adaptor)
Successful support of a serial device is dependent on the RS232 communications settings being correct, the com port being available (if it exists and is not in use by another driver) and that the data is being seen on the port in the correct data format.
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