I'm trying to set up a serial connection at 250000 baud rate (optimal baud rate for other side) with win32. SetCommState returns error 87 (bad parameter). The doc says "Baud rate at which the communications device operates. This member can be an actual baud rate value, or one of the following indexes." Highest index 256000. Is there limitations with HW? Anyone got tips/hints?

Regards, Ljung