I’m in the process of trying to port plptools, a userspace open source implementation of Psion’s PLP (serial link) protocol, to Haiku. I’ve managed to get most of it working. However, I’m having an issue regarding RS232 DSR detection, an important part of the PLP protocol. Currently, ncpd (the main PLP service) can’t detect when DSR is high. I think it might be struggling with DTR, too. I’ve tried with two separate USB RS232 adapters - a FTDI FT232R and a Prolific PL2303TA. I also...
