[GreenKeys] Usb adapter

[Andy KN4UCL]

FWIW my experience with Edgeports is great under Windows... but fails under
linux with "cannot send clear loopback command" in dmesg.    cheers!



On Sat, Dec 11, 2021 at 11:38 AM William Wuttke <wcwuttke at gmail.com> wrote:

> The Digi Edgeport 8-port USB to RS-232 works fine at 45 baud 5 bits. They
> are expensive new but can be had for less than $50 on ebay.
>
> Bill
>
> On Fri, Dec 10, 2021 at 7:52 PM Paul Heller <paul0926 at comcast.net> wrote:
>
>> I’ve had little success with these USB to RS-232 adapters at 45 baud. I
>> have tried more than one, including the Sabrent one Michael linked from
>> Amazon (I bought two many years ago and neither worked). Your mileage may
>> vary.
>>
>> The ITTY program transmits at 45 baud and works fine on a Windows
>> computer with a real RS-232 port but not with a Windows computer with a USB
>> port. I suspect Windows USB drivers are somehow getting in the way. The
>> specs for the Sabrent converter on Amazon state Baud rate: 300bps to
>> 1Mbps. Perhaps that is for Windows only.
>>
>> Is anyone able to get slow baud rates using Windows with one of these USB
>> to RS-232 adapters?
>>
>> Paul
>> W2TTY
>>
>> On Dec 10, 2021, at 6:52 PM, Michael Katzmann <vk2bea at gmail.com> wrote:
>>
>> 
>> I worked to get the Linux kernel driver to work at arbitrary baud rates
>> on the Prolific PL2303A-TA USB to serial chip.
>>
>> This can do 5 bit / 1.5 stop / 45 baud with the linux driver although the
>> chip can actually get closer to 45.45 Bd if you want to tweak the driver.
>> (the linux ioctl call (termios2 structure) only handles integer bit rates)
>>
>> https://github.com/torvalds/linux/blob/master/drivers/usb/serial/pl2303.c
>>
>> This chip is used in this USB to serial device (and many others)
>> https://www.amazon.com/Sabrent-Converter-Prolific-Chipset-CB-DB9P/dp/B00IDSM6BW
>>
>> I was using it with the ASR33 (110 Bd) but did check the 45 Bd use. As
>> with the 33 you will need to go from RS232 to current loop.
>>
>> Michael   NV3Z / VK2BEA / G4NYV
>>
>> On Fri, Dec 10, 2021 at 1:38 PM chris johnson <archangel_cpj at hotmail.com>
>> wrote:
>>
>>> Anyone making a batch of adaptors for usb to model 15 use????  Or have
>>> any already made for sale????
>>> ______________________________________________________________
>>>
>>
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>
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> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
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> >>> 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
>
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> Please help support this email list: http://www.qsl.net/donate.html
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