Thank you for your enquiry and sorry for the delay in replying
For help downloading the PT300, please see the following links (note this is for the PT300 and PT350)
The general set-up is:
Bits per second: 57600
Data bits: 8
Stop bits: 2
However, this is not set in stone, for example the bits per second can be changed – but the instrument and software should be set the same.