[GreenKeys] Connecting a Model 14

[John Nagle]

On 08/11/2014 10:30 PM, Daniel Newman wrote:
> John! That worked!
>
> Tapping the the 1/8" plug with the 9V battery successfully prints the
> letter "V". Neat!
>
> Ok, on to step 2. I'm going to connect a socket to the DB-9. I'm
> planning on connecting pin 3 to the tip and 5 to the sleeve, does that
> sound correct?

    That should work.

> I've got an old windows laptop with a serial port and will try and get
> baudotRSS up and working.

    That's a good way to do it.  Classic serial ports will usually
go down to 45 baud.  USB devices, not so much.

    It may be easier to start with Heavy Metal, if you're not familiar
with Python.  The "baudotRSS" install is kind of complicated, and
Baudotrss has no user interface on the computer screen.
BaudotRSS is most useful if you have the Teletype keyboard connected 
into the serial port, because it's controlled from the Teletype 
keyboard.  (There's an RO mode; it prints the Reuters RSS feed,
and there's no way to interact with it at all.)
Heavy Metal is controlled from a user interface on the computer,
which is easier when you're starting out.

> I'll let you know how it goes!
>
> Danny
>
> On Mon, Aug 11, 2014 at 5:20 PM, Jim Haynes <jhhaynes at earthlink.net
> <mailto:jhhaynes at earthlink.net>> wrote:
>
>     On Mon, 11 Aug 2014, John Nagle wrote:
>
>         Metal can run that.  So can my "baudotrss".  With a modern
>         computer, you'll probably need a USB to serial converter,
>
>
>     Seems like I've heard that some of the USB to serial converters
>     can't do 45 baud and 5 level code.  Is that true?

    Not many USB to serial devices can do 45 baud at all.  The
Silicon Labs CP2102 can, but you have to get it in eval board
form, where it's still re-programmable, and run the baud rate
setting utility to make it interpret some other baud rate as 45 baud.

(The newer CP2104 won't go below 300 baud.  I just sent a note to
SILabs asking how much longer the CP2102 will be available.
I suspect that in the next few years, we'll have to start generating
serial bits in software on an Arduino or something similar, as
hardware support for 45 baud, 5 bits, no parity, 1.5 stop
bits disappears completely.)

				John Nagle