I just received and installed the Plugable USB to RS-232 DB9 Serial Adapter (Prolific PL2303HX Chipset) on a MacBook Pro running 10.7. According to this installing-a-usb-serial-adapter-on-mac-os-x article/ my installation was successful.
I have a summa vinyl cutter/plotter hooked up through this adapter. The plotter software is able to communicate with the plotter and get back the material size that is loaded. However when a job is sent nothing is happening. I’ve checked and tried different baud rates, parities, handshakes etc…
The plotter manufacturer is looking into it and will be calling me back. The serial cable used is supplied from summa as it is pinned out differently according to them.
While I await for them to call me back and say that they can’t support the serial adapter would anyone like to chime in?