Hello Gakkus, and welcome in the forum.
If I remember well, there's no handshake management in the .Net MF version 4.1. Still haven't check in the more recent 4.2 release, though.
May I ask you what's your purpose?
I had to control the RTS for a RS485 interface, but I turned to an hardware solution, instead of a software way.
Cheers
Gakkus,
I use D9 to do something similar. You can implement your own RTS. I used this on MAX483...
//Apaga para dejarlo en modo receive
TXEnable.Write(false);
RXEnable.Write(false);
//Espera milisegundos para el turnaround
Thread.Sleep(1);
//Para limpiar el buffer de respuesta
ceMemset(ref iresponse, 0, iresponse.Length);
// ---------------------------------- NOTA: No usar breakpoints aquí dentro!!!!
while (com1.BytesToRead >6)