[GreenKeys] Interface ASR33 to Linux serial port

[Tom Lake]

I have an RS-232 to 20mA current loop converter that fits inside the TTY’s case. It plugs into one of the gang connectors in the TTY.



 

From: David V. Corbin <david.corbin at dynconcepts.com> 
Sent: Thursday, January 4, 2024 5:45 PM
To: Michael Katzmann <vk2bea at gmail.com>; tlake at twcny.rr.com
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Interface ASR33 to Linux serial port

 

What are you using to go from the pie to the current loop is a commercial converter or did you build one yourself.

 

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From: greenkeys-bounces at mailman.qth.net <mailto:greenkeys-bounces at mailman.qth.net>  <greenkeys-bounces at mailman.qth.net <mailto:greenkeys-bounces at mailman.qth.net> > on behalf of Michael Katzmann <vk2bea at gmail.com <mailto:vk2bea at gmail.com> >
Sent: Thursday, January 4, 2024 5:32:46 PM
To: tlake at twcny.rr.com <mailto:tlake at twcny.rr.com>  <tlake at twcny.rr.com <mailto:tlake at twcny.rr.com> >
Cc: greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>  <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net> >
Subject: Re: [GreenKeys] Interface ASR33 to Linux serial port 

 

I've got a PiDP11 with a 33 attached. 

Usually the 33 is driven off the PDP11/70 SIMH emulator.

I tried running the agetty command as you showed and it looks like it worked (except bash is confused for some reason)

The OS is Raspbian (32 bit) but its pretty close to Ubuntu (both based on Debian). I favour Fedora myself!

 

Michael

 

 



 

On Thu, Jan 4, 2024 at 3:52 PM Tom Lake <tlake at twcny.rr.com <mailto:tlake at twcny.rr.com> > wrote:

I have an Ubuntu 23.10 system with agetty running on its eight serial ports. I can hook up most terminals to the ports and login to a bash shell.

When I try to use a Teletype ASR 33, however, I get the login prompt and I answer enter the username. If I hit Return, nothing happens. If I hot Line Feed, the Password prompt is shown.

After I enter the password (all uppercase) Incorrect password is shown.

 

Since the prompts are displayed properly, I’m pretty sure the baud rate, BPS and stop bits are correct. What else can I check?

 

I start agetty this way:

 

agetty  -L -U ttyUSB0 110 tty

 

The -L means it’s a dedicated line, not dial-in. The -U means the terminal is uppercase only and some upper/lowercase conversions should be made.

The port is a USB to serial port (ttyUSB0), baud is 110.

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