IBM 6094-010 "Dials" protocol?

[Ethan Dicks]

On Sun, Mar 25, 2018 at 3:48 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
> I went noodling around eBay and found a couple of types
>
> SN-921 (2.1mm barrel jack for +5V)
>   https://upload.wikimedia.org/wikipedia/commons/7/74/Sgi_dialbox_sn-921_front.jpg
>
> DANAHER CONTROLS Dials DLS80-1022 (+5V over DE9 serial cable - has
> special Y-cable for power injection)
>   https://upload.wikimedia.org/wikipedia/commons/c/cd/SGI_dialbox_DLS80-1022_front.jpg
>
> I have worked with a number of devices that are powered by +5V via
> their DE9.  Routinely, that's done by not connecting Pin 9 (RI) from
> the host and injecting +5V into the device on its Pin 9...

Not even close...

http://yehar.com/blog/?p=3471

The (Seiko?) SN-921 can apparently be powered via DE9 or the 2.1mm
jack next to it...

1. GND
2. SERIAL OUTPUT (±9 V)
3. SERIAL INPUT
4. POWER IN +5 V
5. POWER IN +5 V
6. NC
7. NC
8. GND
9. NC

The Danaher Controls DLS80-1022 has a DIN-5 at the end of its Y-cable
for input power.  It's +5V and +/-12V (because it does not generate
serial voltages internally), I now gather...

1. POWER IN +12 V
2. NC
3. POWER IN +5 V
4. GND
5. SERIAL OUTPUT (±12 V)
6. NC
7. SERIAL INPUT
8. NC
9. POWER IN -12 V

Easy enough to feed, but good to know it's got an odd pin/power arrangement.

Now I'm really looking forward to unboxing these next month!

-ethan