If anyone is interested, the FTDI equipment / driver did the trick.

Thanx for the shutdown procedure. I'll use that for sure.

After more research I see plenty of issues with USB serial adaptors. The ones I am testing on are the 2303 chipset which are (I have recently learned) reputed to be wonky. I am ordering a dual port FTDI to try.

S

Hi , I am working on a simple data logging program using USB - serial adaptors. When I execute this cat /dev/ttyUSB0 > /tmp/file.log I can type on a terminal on another machine connected by null modem and the data is written into. file.log as expected. However... If I Ctrl-C and stop (or kill from s...