I have a USB to Serial port adaptor, Prolific Technology, Inc. PL2303 Serial Port which works on ubuntu 10.04, and win xp, win7 machines. However, I have problems with it on Ubuntu 13.10 and 14.04 LTS. It enumerates OK and shows up as /dev/ttyUSB0 or /dev/ttyUSB1. Currently I am trying to connect to a cheap RS232 multimeter which connects to pin 2 (Rx data) and the pin 4 (DTR) line.
1.)Does anybody know whether the usb-serial drivers for PL2303 work or are broken? If they are OK, then 2.)does anyone know how to set or reset the DTR line? This is used to enable or suppress the output from the multimeter.
currently using tcl/tk for accessing hardware.