On Monday, December 31, 2018 3:20:22 PM EST Wells, Roger K. wrote: > Hello > I hope this is the right list,if not please advise. > > In my work I have been using and writing code to use rs232 serial ports > going back to before the first IBM PC. > Currently I primarily use USB to serial adapters, made by Prolific > (PL2303) and Belkin(F5U109/F5U409). > These devices are anything but new going back more than ten years at > least in the Belkin case and I have been using them about that long. > I have always been impressed how Linux & specifically Fedora/RedHat > recognize these devices with no fuss or fanfare. > I have just come across an anomaly that to me indicates a change in the > F29 release that I hope someone will find interesting. > Recently I needed to run a series of tests to verify data exchange at > various baud rates. > The tests have been performed on Fedora 29: (4.19.10-300.fc29.x86_64) > and CentOS 7.6: (3.10.0-957.1.3.el7.x86_64) systems. > The tests involved sending data from one system to the other and then > reversing the role of each system. > On both systems the Prolific device supported baud rates: > 200,300,600,1200,1800,2400,4800,9600,19200,38400,57600 & 115200 > On the CentOS 7.6 system the Belkin device supported baud rates: > 300,600,1200,2400,4800,9600,19200,38400,57600 & 115200 > On the Fedora 29 system the Belkin device only supported baud rates: > 4800 & 9600 > This was the surprise. As long as I have been using these devices on > Fedora I am comfortable stating that I would have noticed this > limitation long ago. > Also, I am currently using three of the Belkin devices and they all have > the same performance so I don't think device failure is the cause. > If anyone would like me to run any additional tests please let me know. > thanks I would ensure that the remote end was using the same baud rate, this is a common issue. Do you use `screen` or another tool? -- John M. Harris, Jr. <johnmh@xxxxxxxxxxxxx> Splentity https://splentity.com/
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