DimkaM wrote:КАК???
http://en.wikipedia.org/wiki/RS-232_RTS/CTS#RTS.2FCTS_handshaking
Смотреть не старое ассиметричное использование rts/cts а новое, для фул-дуплекс передачи, когда rts/cts значат одно и тоже но один для DTE а второй для DCE (по сути это сигналы busy, указывающие, что DTE или DCE готовы принять еще байты в фифо).
В современном ком портовом оборудовани используется только такой режим:
A non-standard symmetric alternative, commonly called "RTS/CTS handshaking," was developed by various equipment manufacturers: CTS indicates permission from the DCE for the DTE to send data to the DCE (and is controlled by the DCE independent of RTS), and RTS indicates permission from the DTE for the DCE to send data to the DTE. This was eventually codified in version RS-232-E (actually TIA-232-E by that time) by defining a new signal, "RTR (Ready to Receive)," which is CCITT V.24 circuit 133. TIA-232-E and the corresponding international standards were updated to show that circuit 133, when implemented, shares the same pin as RTS (Request to Send), and that when 133 is in use, RTS is assumed by the DCE to be ON at all times