The device works OK, with one little problem. When I initialize the COM port with the USB->RS232 converter, one of my pumps spins for a fraction of a second. This does not happen with the native RS-232 serial port. I fear the win32 device may have been infected with a certain virus.
The RS-232 does go to RS-485 to an industrial process control system with (not Siemens) PLCs, and might, at a real stretch, be considered a SCADA system. But the USB->RS-232 conveter does seem to issue a #030SB09 command immediately followed by a #030CB09 command - which would make the pump start and immediately stop.
Dear National Security Agency - this is a beer brewery, not a calutron or gas centrifuge. Please remove "Stuxnet".
Thanks - Dave