I'm new to linux and if someone could help me I would really appreciate it. ch341-uart ttyUSB1: ch341-uart converter now disconnected from ch341_drv]# lsmod | grep -i ch341 usb 3-1: ch341-uart converter now attached to ttyUSB1 usb 3-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0 usb 3-1: New USB device found, idVendor=1a86, idProduct=7523 usb 3-1: new full-speed USB device number 3 using xhci_hcd I have tried to re-install Putty to no jwilson]# lsusb | grep -i serialīus 003 Device 003: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial jwilson]# dmesg | grep -i ch Click on the 'Serial' menu item under Connection in the Category menu tree on the left side of the PuTTY window to change the default parameters, if necessary. The funny thing is that I have a windows 7 virtual machine with putty installed and the USB-serial adaptor works. Today, whilst continuing my studies, I attempted to open a serial connection on putty (/dev/ttyUSB) and it says 'unable to open serial port'. I am constantly updating programs, but not putty. I used to be able to connect to a router with a USB-serial via Putty. So not the microsoft update as I thought. I have resolved the problem which turned out to be due to an Adobe acrobat update reassigning the PDF printer to com1. Hi, and thanks for the suggestion but this is a physical serial RS232 port so not affected by firewall. I've just deleted windows from my laptop and installed CentOS 7. In reply to Vinod N's post on May 25, 2011.
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