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On 12/31/18 3:39 PM, John Harris wrote:
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. thanksI would ensure that the remote end was using the same baud rate, this is a common issue. Do you use `screen` or another tool?
-- Roger Wells, P.E. leidos 221 Third St Newport, RI 02840 401-847-4210 (voice) 401-849-1585 (fax) roger.k.wells@xxxxxxxxxx |
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