This is interesting - we have the same software (HyperTerminal) =
exhibiting two=20
mutually exclusive behaviors.  Certainly not the first time something =
like this has=20
been observed in the WWW (Wonderful World of Windows).

But, of course, it is NOT the same. We likely have different releases of =
the software=20
running on many different versions of the OS, which is in turn running =
on different=20
hardware. If one wanted to document the behavior of different release =
versions of=20
the program, with different PC hardware and different versions of =
Windows, a pattern=20
would probably emerge.  This, while interesting, is probably not worth =
the trouble,=20
since the hardware loopback jumpers, when needed, are the universal =
"fix".

This type of inconsistent behavior is one of the (supposed) reasons for =
changing=20
over to USB and killing RS232.  As those who have tried to implement USB =
in a=20
device can tell you, it is not the answer either.=20

RJG
  ----- Original Message -----=20
  From: Olin Lathrop=20
  To: Microcontroller discussion list - Public.=20
  Sent: Tuesday, September 27, 2005 12:06 PM
  Subject: Re: [EE] USB to RS232 converter


  Alan B. Pearce wrote:
  > It does not send a character on the TX line, but it does play with =
the
  > DTR/DSR lines to detect if there is a device it can talk to.

  But most of my devices have nothing connected to those lines and =
HyperTerm
  still talks to them fine.


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