[GreenKeys] need low speed usb to RS232

[Jeff Stai]

hi Michael - I knew I was forgetting something (it has been a while). It's
worth a few dollars to give it a try and if not I can always use one more
USB/serial someplace - thanks! - jeff wk6i

On Thu, Mar 10, 2022 at 10:11 AM Michael Katzmann <vk2bea at gmail.com> wrote:

> I did some work on the Linux serial device driver for the Prolific PL2303
> and it can certainly do low bit rates.
> https://github.com/torvalds/linux/blob/master/drivers/usb/serial/pl2303.c
> On Linux you can set an arbitrary rate (but only to the whole baud) but if
> you modify the drive you can get a little closer (45.77 Bd).
> I plugged the device I have here into a windows 10 machine and it allows a
> 75 Bd rate (which is one of the 'standard' rates) but I don't think the
> Prolific driver will do arbitrary rates.
> USB to Serial cables with the PL2303 are cheap on Amazon ($10) (mine is
> made by Sabrent).
> cheers,
>     Michael (NV3Z /VK2BEA / G4NYV)
>
> On Wed, Mar 9, 2022 at 8:25 PM Jeff Stai <wk6i.jeff at gmail.com> wrote:
>
>> I want to connect and use my ancient but beloved hardware modems via an
>> RS232 to USB connection.
>>
>> I have dodged this question for years by installing PCIe to RS232
>> adapters that were 16550 UART compatible. These adapters go slow enough to
>> transfer 45/75 baud.
>>
>> Modern FTDI USB/RS232 adapters won't go below 300 baud. And I'm running
>> into needing to connect to Win10/Win11 PCs that don't have available PCI
>> slots. (Progress...)
>>
>> I know old Edgeport adapters might be the answer. If I can find one and
>> the available drivers behave on Win11 maybe that will work... but are there
>> any other alternatives I'm missing?
>>
>> Thanks & 73 jeff wk6i
>>
>>
>> --
>> Jeff Stai ~ WK6I ~ wk6i.jeff at gmail.com
>> RTTY op at W7RN
>> Twisted Oak Winery ~ http://www.twistedoak.com/
>>
>>
>
>

-- 
Jeff Stai ~ WK6I ~ wk6i.jeff at gmail.com
RTTY op at W7RN
Twisted Oak Winery ~ http://www.twistedoak.com/
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