Telnet and Control break Key
dsc at swcp.com
Tue Sep 3 00:10:00 EDT 2002
On Monday, September 2, 2002, at 08:58 PM, Luis Camou wrote:
> I agree with you. I am sorry I did not phrase my questions right,
> I have
> the serial part working ... thanks to Sarah ( Serial test ) , what
> I need is
> the break key ( windows?) for the serial part to do the password
Hmm. "Break" may be ambiguous here.
If you have been using a telnet client to talk out the serial port,
you probably need the telnet break--byte code 129, I think.
However, if you need an RS-232 break, that is something different.
It is not a byte, but an action out-of-band. A serial line is
either in the mark (1) or space (0) state. The serial line is
normally held in a marking state (1). When a character is sent, a
space (0) start bit is sent, then the data bits and then one or two
mark (1) stop bits. A break is a space that is held longer than a
character time, that is, past the expected mark stop bit.
I don't know of a direct way to send this kind of break with
Revolution. However, here is an idea that might work. Close the
serial connection, open it again at a much lower bit rate, send a
null, delay the break time, close the connection and reopen it at
the original rate.
(The handshake lines might drop; this probably won't be a problem,
but it might be. You might need to change the serial cable wiring
I think your problem is tougher if this is what you need. I'd like
to see how you do this if this is indeed your problem.
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