PL-2303 Edition USB to Serial Bridge Controller Product Datasheet Document Revision: 1.6 Document Release: April 26, 2005 Prolific Technology Inc. PL2303 attached to ttyUSB0 >Change it to. ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 005. Usb 5-1: Manufacturer: Prolific Technology Inc. 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.

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.

To answer my own questions, 1) the usb-serial drivers for PL2303 do work and are not broken. I think most of the problems arise from the initialization where the DTR line defaults to -ve volts ie 0. Contact.

Previous versions of Ubuntu ie 10.04 the default was +ve volts on the DTR line. Note that other usb to serial converters such as Belkin F5U409 in UBUNTU 14.04 default to +ve volts on DTR line thus work OK.

Confirmation of working drivers was done using GTKterm and toggling the DTR line. Furthermore connection to a Stanford Research SR830 Lock-in amplifier was established and its identify verified. – May 20 '14 at 7:04 •.

Goal: configure serial to USB cable for 9600 8-N-1 Cable is plugged-in and observed: root@OpenHAB:~# uname -a Linux OpenHAB 3.18.11-v7+ #781 SMP PREEMPT Tue Apr 21 18:07:59 BST 2015 armv7l GNU/Linux root@OpenHAB:~# lsusb Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS] Bus 001 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port root@OpenHAB:~# ls /dev/ttyUSB* /dev/ttyUSB0 Is there a good reference for configuring a Is there a litmus test that can be performed from the command line to confirm that the serial port is online and at the ready? Root@OpenHAB:~# dmesg grep pl2303 [ 1641.828007] usbcore: registered new interface driver pl2303 [ 1641.828171] usbserial: USB Serial support registered for pl2303 [ 1641.828287] pl2303 1-1.4:1.0: pl2303 converter detected [ 1641.832474] usb 1-1.4: pl2303 converter now attached to ttyUSB0 [ 1871.361673] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0 [ 1871.361757] pl2303 1-1.4:1.0: device disconnected [ 1922.390068] pl2303 1-1.4:1.0: pl2303 converter detected [ 1922.394341] usb 1-1.4: pl2303 converter now attached to ttyUSB0 – Jan 24 '16 at 23:28.