On Monday, April 06, 2020 03:50:59 AM tomas@tuxteam.de wrote: > Besides, a wrong baud rate would much less explain that writing is > possible, but reading isn't. Not for classical "serials" (i.e. RS-232). From the OP: " On this system a serial port can only receive data and not transmit." Wouldn't that mean that (from the perspective of a program running on the OP's computer) that the serial port can read but not write?