[GreenKeys] USB-teletype adapters - Terminal Servers

[Paul Birkel]

Eugene:  Which brand/model terminal server device are you using?  I didn't
know that any allowed you to cross-connect any two devices and then handle
speed translation (etc.); nice feature!

-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of W2HX
Sent: Thursday, March 17, 2016 5:11 PM
To: epvgk at limpoc.com; greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] USB-teletype adapters

If I am not already, let me be the first to tell you this is absolutely
brilliant. In so many ways,  you should be congratulated for this project. I
am very impressed. Small touches like baud rate changes (and generation of
the baud rate) and a local mode to allow you to set up parameters. Just
brilliant.

As for me, I hate USB! In my shack, I have a lot of serial devices. From
computers, to GPSDOs, one Cesium Clock, receivers that use serial control,
b-bit CNC paper tape reader/punch, an S100 computer, a PDP-8/e etc, etc,
etc. All of these use RS232 and are all connected up to a terminal server
which is connected to my home network. This allows two things. One, I can
communicate with any of these devices from anywhere in the house or anywhere
in the world using telnet. Second, I can issue commands to the terminal
server to cross connect any two devices and it will handle speed translation
etc, for me. It is not an expensive device on ebay. I think mine has 24
ports.

I would LOVE to put one of your  devices onto my terminal server. This would
be fantastic. Imagine, I could then connect my M28 to my IMSAI or PDP. I
could use my M28 as a printer for my PC. I could have my GPSDO send its time
or NMEA sentences to my M28. I could run all my 5-bit tapes to my PC in
order to store them. I could interconnect my M28ASR and copy my 5-bit tapes
to 8-bit mylar tape for long term storage by cross connecting to my CNC
punch. And then print from the 8-bit tape (which would only contain 5 bits
of data) to my M28. SO MANY ACTIVITIES (to quote the "Step Brothers" movie)!
All of these things would be possible by sending very simple commands to my
terminal server (ie "/C 4 5" connect port 4 to port 5).

But for me, USB doesn't fit :( Maybe either, there could ever be a serial
version of this board, or could I use some kind of USB-serial dongle of some
kind?

One last question, the documentation mentions that ASCII characters that are
unknown to ITA5 would be ignored. Is there an option to translate lower case
letters to upper case before going to the TTY side of the circuit?

Anyway, GREAT WORK!
Eugene


-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
epvgk at limpoc.com
Sent: Thursday, March 17, 2016 2:35 AM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] USB-teletype adapters

Hey, 

So I got the first few sample boards back for my USB serial teletype
adapter. 
Miraculously I appear to not have screwed anything up in the CAD files, so
they actually work. The assembly service only forgot a couple of parts :) 

I will probably go ahead and have a small batch built on the assumption that
at least the people who responded to my previous mention of it will want
some. 

I've done a little write up about it if you'd like to peruse and offer
thoughts. 
I probably won't do major overhauls of the hardware, but the firmware is
still a work in progress. 

Check it out at http://heepy.net/index.php/USB-teletype

eric
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