On 1/3/21 10:01 PM, Jameel Akari via vcf-midatlantic wrote:
Bringing us to USB-to-RS232 dongles, on which I’ll have to disagree, or at least say that your mileage may vary considerably. If you find one that works fine for you, it really opens up your options.
I have to agree with Herb on this one. I have friends who work on Railroad equipment that needs RS232C (supports +/- 25V). We've seen a lot of equipment that doesn't work well with USB adapters because they can't source the current. I do think the good PL-xxxx RS232C dongle work but the lesser ones fail miserable. If you drop a line driver in between it then works. On the issue of USB 1.1 (whose packet can handle 8 bytes) and serially connected devices: my friends and I have seen a problem with hand shaking skid (signal wait and sender skids to a stop). We've seen where changing the inter-character delays can help with this. Also the new line delays. That doesn't mean it can't work but you've got to know that there is a problem and were to look. I use a cheap ch340 USB TTl dongle and I have to cut a line at a time to paste to the device (115k). As far as a portable device, I use a chromebook as my serial terminal. -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies