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

[drlegendre .]

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?

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..

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.

On Mon, Apr 4, 2016 at 8:32 PM, John Nagle <nagle at animats.com> wrote:

> On 04/04/2016 06:10 PM, drlegendre . wrote:
>
> Now I have a question about the whole auto-start thing. I don't see that
>> my M15 (ex-Bell) has any sort of motor control relay installed. So how
>> is that normally handled? Is the relay an internal / external accessory
>> or option provided by Teletype Co. or something else? I see that the
>> Aetheric design does allow for a control relay, but a Solid-State
>> device, in that case.
>>
>> So how do I implement the auto-start function? Do I re-wire my M15 to
>> incorporate a SS relay, or do I need some old, original parts to make
>> this work? I do have what I think is an appropriate SS relay, for what
>> that's worth..
>>
>
>   I just used a standard solid-state relay, because you can
> drive those from a +5 logic level or an RS-232 signal.
> It's connected to one of the RS-232 control lines (RTS, Request
> to Send) which you can turn on from the computer side.
>
>   On my control box, the power outlet for the Teletype is controlled
> by that solid state relay.  The Teletype's wiring is completely
> stock, except that I put a new 3-wire cord with ground and
> standard 120VAC plug on all my machines.
>
>   The control box
>
>     http://www.aetherltd.com/aesthetic.html
>
> has a USB to serial converter, the serial to current loop board,
> a 120VDC power supply, the solid state relay for the motor control,
> a GFCI outlet device protecting against ground faults, a 5A
> circuit breaker, a meter, big indicator lamps, and a big black
> button which does a BREAK.  That's all it does; there's no computer
> in there.  Input is a USB port.
>
> The "baudotrss" software manages startup and shutdown. There are
> delays on both startup and shutdown. At startup, time is allowed
> for the motor to come up to speed, and at shutdown, time is allowed
> for all remaining characters in the queue to print.
>
> The Teletype system turned on the motor on any MARK to SPACE
> transition, and turned it off on receipt of a STOP (FIGS-H).
> This option isn't standard USTTY or ITA-2, but apparently
> was once orderable.  I've seen this in documents, but don't
> have any machines with the feature.
>
>                                 John Nagle
>
>
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