[GreenKeys] So what else can I do with this?

[John Nagle]

On 04/04/2016 06:44 PM, drlegendre . wrote:
> Oh ok, so the auto-start relay is simply a switch in series with the
> AC line to the TTY machine. IOW, it's in series with the front panel
> power switch.
>
> Suppose so, as there's nothing else in the machine to 'power' other
> than the motor. The motor is the prime mover for the whole machine,
> no other electrical or electronic systems are in use. Correct?

     In most machines, yes. See

http://www.aetherltd.com/public/model15manuals/144_Model15_Descr_Feb31.pdf

p. 38, drawing 1358 (Jan 29, 1931) for the original motor control
wiring. Note that this is for a governed motor powered from DC.

> Is there a standard method of wiring in the relay (on the TTY side)
> using the extant terminal strips? I'm fortunate enough to have
> received a machine that's essentially 100% original, in terms of
> wiring..

If you have motor stop hardware, you should be able to stop the motor
by sending the STOP character. In that case, the relay, STOP code
bar, and some extra contacts should already be present.

Unless you have the mechanical parts for recognizing STOP
(see p. 29 of the Description manual) adding a Teletype motor control
relay is kind of pointless.  If you're putting the machine under
computer control, I'd suggest just switching the entire machine power
on and off. All a Model 15 has is the motor.   (Model 19 machines
have a lot more powered stuff.)

> Does any of this concern, or rely upon the pause / break switch above
>  the keyboard, to the left? Mine lacks the internal parts for that
> feature. They may have been removed.

No, that's a completely separate component.

				John Nagle