[GreenKeys] TTY to Ethernet Converter or TTYoIP

[Lee Spenadel]

Keelan,

This is quite impressive.  This prompted a thought in my mind.  Has anyone
been able to interface a POP/IMAP email account to TTY?

Lee

From:  Keelan Lightfoot <keelan at mail.grenander.com>
Date:  Sun, 31 Jul 2011 18:42:14 -0700
To:  Green Keys <greenkeys at mailman.qth.net>
Subject:  [GreenKeys] TTY to Ethernet Converter or TTYoIP

Lee's queries about connecting a teletype to a PC has prompted me to share a
project I've been working on.

I'm working on a 'TTY to ethernet' converter, that will eliminate the need
for a separate computer entirely. The hardware design is complete, and I
have all the pieces needed to build a prototype, I just haven't had the time
to put one together. The hardware will occupy a board about the size of a
business card, and will include an ethernet port for connecting to a
network, and a teletype loop connection (reconfigurable as either half
duplex or full duplex).

My initial design was going to use a Lantronix XPort, which is a
serial-to-ethernet converter housed in a slightly oversized through hole
ethernet jack. The XPort wasn't capable of anything lower than 300 baud, 8
bit operation, so I was going to include a PIC microcontroller to handle the
conversion to 45 baud, 5 bit operation. Then I discovered that the same
people that make the Xport also make the XPort 'pro', which is the same
hardware, but it runs a tiny Linux OS.

I've spent some time poking around the serial driver firmware source, and it
supports 5 bit operation out of the box (contrary to the XPort
documentation), and with a few changes to the firmware, I will be able to
add 45.45, 50 and 75 baud operation.

The idea is to allow a teletype to connect to any internet service that
supports telnet, including other teletypes. I've also been working on a
'TTYoIP' server that would allow a number of teletypes to be connected
together on a virtual loop via the internet.

Anyway, I'll update as I make more progress on the hardware, but I'm curious
if there'd be any interest in this. The fully populated board would probably
cost somewhere in the range of $100, most of that cost is for the XPort
module, which costs around $70 alone.

- Keelan
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