[GreenKeys] Usb adapter

[William Wuttke]

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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