[GreenKeys] Interface ASR33 to Linux serial port

Tue Jan 9 12:34:41 EST 2024

DriverGenius 4 Port USB to Serial RS232 DB9 Adapter Coverter with 12 X LEDs
- Win11 & Mac (4XRS232, Metal) https://a.co/d/6xXQ0fy

This is what I use, definitely does 110 baud on all 4 ports, should do
lower.

Uses the PL2303 I think, the FTDI I have had issues at low speeds.

-Eric

On Tue, Jan 9, 2024, 11:13 AM Chuck Rehor <chuck at rehor.com> wrote:

> Hi GreenKeyers,
>
>
>
> In the past for my RS-232 projects when I’ve needed serial communications,
> I ran into unexplained problems with USB-to-RS232-Serial converters
> incorporating the Prolific chipset. Since Prolific has become so, well,
> prolific, it has a huge market share, so foreign companies have knocked off
> the Prolific chip and flooded the market with counterfeit chips marked
> Prolific, but are NOT Prolific brand.  These counterfeit chips have flooded
> the electronics parts supply chain, and therefore, have been inadvertently
> used in even legitimate companies' USB adapters (even name-brand
> companies).  To protect themselves, Prolific finally changed their drivers
> so that their drivers are on the lookout for bogus chips. I think those
> Prolific drivers are part of the Microsoft Plug-n-Play devices.  If the new
> Windows driver finds a counterfeit chip being used on the system, the
> driver will give a warning and disable the device by overwriting the driver
> on your system. With the RPi running its version of Linux, I’ve scratched
> my head trying to get gettys to run right because it might show the login
> prompt, but either not accept characters, or it accepts characters but
> would not give me a Password prompt, so I couldn't get logged in. Searching
> on the internet, I saw other people had problems with the Linux drivers too.
>
>
>
> So I’ve given up on Prolific and only use devices which use the FTDI
> chipset. If a device doesn't specifically say it uses the FTDI chipset,
> chances are it doesn't, so I don’t bother with it.
>
>
>
> Recently I’ve had great luck with Gearmo 4-Port RS232 to USB FTDI chip
> Adapter w/RX and TX Status LEDs (
> https://www.amazon.com/Gearmo-Port-RS232-Adapter-Status/dp/B08P24ZQ1B
> $44). It comes in a version that doesn't have the status LEDs for a few
> dollars cheaper, but LEDs are well-worth it when trying to debug something.
>
>
>
> If you only need one RS-232 port, I can recommend Gearmo's USB to Serial
> RS-232 Adapter with LED Indicators FTDI Chipset (
> https://www.amazon.com/gp/product/B00AHYJWWG   $23).
>
>
>
> The only thing I can't verify is if it goes down to 110 baud (I don't have
> a 110-baud device in the same location).  I did connect Ports 1 & 2
> together (via a null modem connector) and opened two putty sessions set for
> 110 baud, 8 bits, 1 stop, no parity, xon/xoff, and it seemed to work (I
> could send characters back and forth between windows).  I used putty
> version 0.78 on Windows 11 and a command line of: "C:\Chuck> putty
> -serial COM5 -sercfg 110,8,1,n,X" because I could never correctly configure
> putty with its GUI.  However, when I opened a putty session for 300 baud
> and kept the other at 110, I expected I couldn’t communicate between them,
> but lo and behold, it worked anyway, so I’m not sure it actually went down
> to 110 and 300 baud.  Maybe it defaults to a certain speed if someone tries
> to give it a speed it can't handle.  Like I said, I don’t have a 110 baud
> terminal in the same location so I couldn’t really verify 110 or 300 baud
> operation, but sometime I will and report back.
>
>
>
> Hope the above helps.
>
>
>
> Chuck
> W9CFR
>
> On Mon, Jan 8, 2024 at 2:36 PM Tom Lake <tlake at twcny.rr.com> wrote:
>
>> I have a PiDP-11 as well and the Teletype works fine with it. I replace
>> the PiDP-11 with the Pi 5 using the same RS-232 converter and I can’t log
>> into Linux with the Teletype.
>>
>>
>>
>> *From:* Michael Katzmann <vk2bea at gmail.com>
>> *Sent:* Thursday, January 4, 2024 5:33 PM
>> *To:* tlake at twcny.rr.com
>> *Cc:* 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> 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.
>>
>> ______________________________________________________________
>> GreenKeys mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:GreenKeys at mailman.qth.net
>>
>> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>> https://teletype.net/gksearch
>> >>> 2002-to-present greenkeys archive:
>> http://mailman.qth.net/pipermail/greenkeys/
>> >>> 1998-to-2001 greenkeys archive:
>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>> http://comcents.com/tty/greenkeyssearch.html
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to vk2bea at gmail.com
>>
>>
>>
>>
>> --
>>
>>    |\      _,,,---,,_             Michael Katzmann
>>    /,`.-'`'    -.  ;-;;,_         NV3Z / VK2BEA / G4NYV
>>   |,4-  ) )-,_. ,\ (  `'-'
>>  '---''(_/--'  `-'\_)
>>
>>
>> ______________________________________________________________
>> GreenKeys mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:GreenKeys at mailman.qth.net
>>
>> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>> https://teletype.net/gksearch
>> >>> 2002-to-present greenkeys archive:
>> http://mailman.qth.net/pipermail/greenkeys/
>> >>> 1998-to-2001 greenkeys archive:
>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>> http://comcents.com/tty/greenkeyssearch.html
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to chuck at rehor.com
>>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive:
> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to mooreericnyc at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20240109/f3c8e869/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 2059553 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20240109/f3c8e869/attachment-0001.jpg>