(1) It is not clear to me whether you want a low-level flow control (e.g. xon xoff) or a higher level. (2) May I suggest Joe Campbell's "C Programmer's Guide to Serial Communications", second edition. Doug -----Original Message----- From: Win Wiencke [mailto:Win@SLYCURVES.COM] Sent: Wednesday, August 27, 2003 4:18 PM To: PICLIST@MITVMA.MIT.EDU Subject: Re: [EE:] serial communication handshaking ? Have you considered XON/XOFF protocols? They tie up two bytes to signal when the sender must stop sending and when the sender may resume (start) sending. Win Wiencke ----- Original Message ----- From: "John Pearson" To: Sent: Wednesday, August 27, 2003 5:15 PM Subject: [EE:] serial communication handshaking ? Do any of the common serial communication handshaking schemes involve just the transmit and receive lines? I would like to get my two devices working "in harmony" and take turns transmitting. I would like to be able to use standard terminals and terminal emulators so I would like to stick to a standard format if one exists. Thanks John -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.