Half-duplex VT420?

From: Dave McGuire <mcguire_at_neurotica.com>
Date: Mon Oct 8 20:29:14 2001

On October 9, Iggy Drougge wrote:
> Since I'll be running another headless computer (HP 9000/380), I brought home
> my VT420. Nice terminal, but unfortunately this specimen will only talk, not
> listen.
> At first, I suspected my HP had lost its settings (the stupid boot PROM must
> be set via the keyboard to use a serial console). I proceeded to bring my HIL
> keyboard home and set it (without any screen) to use a "remote" console again,
> and the machine seemed to acknowledge that, beeping happily. But no response
> from the terminal. So I tested it with my DECstation. No response there
> either. So I hooked it up to my Amiga. Typing at the keyboard, there was
> output in NComm, but doing the opposite didn't work at all.
> So we have only one-way communication. What could be the problem?

  Is flow control enabled on the terminal? I assume you're using a
DB25 adapter at the other end of an MMJ cable. Try turning off flow
control in the communications setup menu and shorting pins 2-3 on the
connector. At that point the terminal should echo what you type back
to the display. If it doesn't, you might have a toasty RS232 line
receiver in your terminal.


Dave McGuire
Laurel, MD
Received on Mon Oct 08 2001 - 20:29:14 BST

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