When trying to communicate to the 590+ in DSELite, via the P3 port, you will need to set the baud rate in the COM selection to connect. This is not the keypad port, instead the P3 port is next to the I/O terminals.
- The baud rate is 9600. The communication mode is (EIASCII).
Note that you will be able to program through this port, but not download firmware to the drive (that requires the keypad port).
[QuickLink for the 590+ on Parker.com] - Manual, QuickStarts, Product Support, etc