I'm currently trying to use an old HP pen plotter to make art. So far, I've been able to send simple HP-GL instructions to the plotter using a usb-serial FTDI cable and the
chiplotle library. Everything works there -- yay!
One thing I haven't been able to make use of is DSR/DTR hardware flow control. As far as I can tell, this has never been implemented in the
usbserial module. Does anyone know of a software workaround for this? (I would like to avoid rewiring the cable to use RTS/CTS pins.) Does anyone know of a patch to the driver that implements DSR/DTR?
Thanks for any help!