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At 02:22 PM 4/6/2006, Ed Karns wrote:<br><br>
<blockquote type=cite class=cite cite="">On Apr 6, 2006, at 12:00 PM,
<a href="mailto:beowulf-request@beowulf.org">beowulf-request@beowulf.org</a>
wrote:<br><br>
<blockquote type=cite class=cite cite=""><br>
<font size=4>And, I suppose one could gang up a raft of $9 USB/Serial dongles on a USB hub (somehow, I suspect that this is fraught with peril)<br>
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<font size=4>The device has to allow independent control of RTS and reading CTS (which may not be used in the usual flow control scheme)</font></blockquote><br><br>
It might be a tall order to get the ":cheap" $9 USB to Serial adapter to do Request to Send / Clear to Send / hardware handshaking ... probably should consider Xon / Xoff / software handshaking instead = not a problem for the least expensive USB to Serial adapters. (Ctrl S / Ctrl Q being easy from the command line or script to get the port to respond.)</blockquote><br><br>
Except that the piece of hardware the serial port is talking to uses RTS and CTS, not as handshaking lines, but to wake up the box, and to return status.<br><br>
However, I did just try it with a cheap USB/RS232 adapter, and I can toggle RTS just fine from a program talking to a Windows COM port. And, they "claim" that they have a Linux driver when I get to that step. I'm sure it's the same FTDI USB/Serial chip that everyone uses.<br><br>
Jim</body>
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