<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 8.00.6001.18702"> <STYLE></STYLE> </HEAD> <BODY style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space" bgColor=#ffffff> <DIV><FONT size=2 face=Arial></FONT><BR> </DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"> <DIV> <DIV>Any suggestions for solving this problem are welcomed :)  </DIV></DIV><FONT size=2 face=Arial></FONT></BLOCKQUOTE> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial>yeah, I tried and gave up. Support for serial ports is really poor. I have a network redirctor device which is a little box with an ethernet adapter on one side and a DSub9 on the other; you configure it to map a serial stream 1:1 onto a network connection, hook up your serial device to the box, open a network port to the box and run your communictation over it and it works like a charm. Try communicating directly and you'll never really get it to work.</FONT></DIV> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial>I believe the problem is that the logic isn't quite sure when to return #eof, a timeout or or a valid character. Then, again, it really can't. I don't have any problems with the Racket developers deciding that serial ports are nothing to spend a lot of effort supporting. It's sort of an ancient technology - still heavily used but really hard to get right. </FONT></DIV> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial>On a write, you must flush the device whenever you're done writing and expect characters to come in.</FONT></DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial></FONT><FONT size=2 face=Arial></FONT><BR></DIV> <DIV> <DIV>Finally, I would also like to report that when opening a serial port (only on windows) with a number greater than 9 </DIV> <DIV>so for example "COM12" a file is created instead of opening the serial port. </DIV></DIV> <DIV>I guess this should be an easy fix ...</DIV></BLOCKQUOTE> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"> <DIV><FONT size=2 face=Arial></FONT><FONT size=2 face=Arial></FONT><BR></DIV> <DIV>If anybody would have experienced that problem you can currently work around that problem by assigning a different (lower than 9 of course) number to the serial port via the device manager. </DIV><FONT size=2 face=Arial></FONT></BLOCKQUOTE> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial>open the port as "<A>\\\\?\\COM13</A>" and you'll be fine. That's a Windows restriction, has got nothing to do with Racket...</FONT></DIV> <DIV><FONT size=2 face=Arial></FONT> </DIV></BODY></HTML>