Sekonic SPL-410 A3 plotter COM port switch settings

[Circlotron]

Today I dug out of the attic the above plotter that I bought second hand in 1991 and I thought I had tossed out about five years ago. Used it to do many PCB artworks back in the day. Anyway, I don't have the manual anymore and I need to find out what the DIP switch settings on the rear need to be set at for different serial data settings. Can anyone help? Probably there are different models from the same manufacturer that have the same switch settings.