![]() Have use a lot of different brands of USB-Serial-Adapters and some just don't work for certain things. I would lean more towards #1 or #2 being the problem. I would uninstall the old driver first, reboot, then try this one. These are supposed to reply to ascii commands with ascii text in reply. I suspect all are some sort of clone from China, but none of these work properly. It would install and look fine, but would get consistent output to the serial device. On this lsusb says all the new units I purchased use the QinHeng usb to serial adapter and require the associated HL-340 driver. I have had problems when the right driver was not installed.
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