Joop, perhaps add to /usr/share/doc/tk2/README.Debian to close the bug:

Q: My laptop has no serial port, I shall buy an USB-Serial adapter.

A: OK, but before leaving the store, be sure there is several volts DC
on some of the RS232 pins, or else, as mentioned in
/usr/share/doc/linux-doc-*/Documentation/usb/usb-serial.txt.gz "The
hid->com adapter ... is incapable of raising line voltage properly,"
referring to e.g., "cypress 1-1.1.3:1.0: HID->COM RS232 Adapter
converter", that means you probably won't be able to establish
communications with the Serial-TTL interface you have made.
Other adapters e.g., ID 0557:2008 ATEN International Co., Ltd
UC-232A Serial Port [pl2303], worked.


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