https://bugs.winehq.org/show_bug.cgi?id=29188
--- Comment #13 from Roger rogerx.oss@gmail.com --- I'm able to read through the serial to USB convertor using the mct_u232 driver.
While reading, wine spawned the following error: fixme:comm:set_queue_size insize 4096 outsize 4096 unimplemented stub
After apparently stopping the assigned task, wine spawned the following error: err:comm:stop_waiting failed to clear waiting state: 0xc0000008
Unknown if the two errors caused any problems with the data transfer, but guessing the first error was probably treated as a notice or there's a fall back for the device. The second error would have to check the data transferred for any problems.
Apparently, the device treated both as notices and the application apparently functioned as it would have under MS Windows. (Bugs and all. Could be those errors were spawned by the original MS Windows application binary for all I know.)
I have not tried writing to the device through the serial USB converter, due to migrating to another application for maintaining the device.
If you can write through the serial USB converter, probably a safe bet to close this bug.