I'm developing an interface application for existing multiport direct connect
modem ports (RS232) that require setting rts=tg (toggle) while keeping
xon=off. The environment is VB in VS2005. I would like to use the
System.IO.Ports.SerialPort class but the only handshaking I see that comes
close is Handshake.RequestToSendXOnXOff (3) and that uses xon=on. The
RtsEnable is a boolean that represents on|off. Rts is actually 2 bits and
can be set to [on|off|hs|tg]. Am I totally missing something or do I have to
fall back to the Win32 API?