TI Silent 743/745 question.

william degnan billdegnan at gmail.com
Wed Mar 23 11:57:02 CDT 2016

On Wed, Mar 23, 2016 at 10:37 AM, Chris Elmquist <chrise at pobox.com> wrote:

> On Wednesday (03/23/2016 at 09:25AM -0500), Chris Elmquist wrote:
> > On Wednesday (03/23/2016 at 02:03PM +0000), Cohen, Corey A wrote:
> > > I'm trying to troubleshoot a TI silent 743/745.   When you press the
> "rubout" key should it print anything like an underscore?   Besides sending
> the rubout character, what does the actual print head do?  Backup? Print an
> underscore?
> >
> > I get nothing printed when pressing RUBOUT.
> >
> > With the unit in off-line mode and in half- or full-duplex, characters
> > typed are printed.  RUBOUT prints nothing.
> >
> > With the unit in on-line mode and half-duplex, chraracters typed are
> > printed and RUBOUT prints nothing.  In full-duplex, nothing prints unless
> > the far end echos it back.
> I should have elaborated a little on what you might be seeing.
> If something does print when you hit RUBOUT and you are on-line and in
> half- or full-duplex, it is possible that the far end, whatever host
> you are connected to, is echoing something back in response to the RUBOUT.
> The terminal sends ASCII 0x7F when you press RUBOUT.  This is a
> non-printing
> character locally but the remote system can send back whatever it likes
> in response to receiving that 0x7F.
> Chris
> --
> Chris Elmquist
What happens when you're in 20 mA mode?  That's what it's for, not serial
comms unless it's mapped specially.  i.e. it's for emulating a teletype.

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