--- In opendiag@yahoogroups.com, Jai Dhar <jdhar@e...> wrote:
> Well, the ISO-9141-2 system on my '96 Maxima doesn't seem to require
> handshaking as it just has a K-line - the handshaking on Jeff's
circuit is on
> the Micro/PC side, which is why I am searching for a design that
doesn't
> require it - easier to code. Jeff's design uses DTR and CTS on the
RS-232 side,
> which are the handshaking lines, correct?
>
> I hope I am not mistaken here,
>
> Jai
>
No ISO-9141 systems use what I consider to be handshaking, and Jeff's
design definitely doesn't. The fact that RTS/DTR lines are used does
not mean that handshake is implemented. If you have no L-Line you just
set up those lines once and then forget them. The beauty of that
design is that it is isolated and the PC side of the interface does
not require any power supply/
/Henrik
Received on Mon Nov 03 00:24:42 2003
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