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When typing the command 'Arc: digtest gtco16 com1:9600:8bit:none' an error returns:
Cannot open communications to digitizer port com1:9600:8bit:none"
There are three possible causes for the error:
1. User does not have read-write permissions for the serial port.
2. The wrong serial port was specified.
3. Another device is using the port.
Each solution below relates to it's corresponding numbered cause given above: