[GreenKeys] need low speed usb to RS232

[Michael Katzmann]

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/
>
>
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