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 <[email protected]> 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 <[email protected]> wrote:
Anyone making a batch of adaptors for usb to model 15 use????  Or have any already made for sale????
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