Re: Fwd: Fwd: Re: pl2303 linux driver does not work

[Greg KH <greg@kroah.com>]

On Wed, Nov 05, 2014 at 12:11:00PM +0800, Batdelger.O wrote:
> 
> Thank you for your quick response.
> It's  just simple python code. I'm not sure if flow control is correct. I
> also used gtkterm and tried by every option.  I'm new at usbserial devices.
> How to know how should it be?
> 
>    import time
>    import serial
>    import sys
> 
>    ser = serial.Serial(
>         port='/dev/ttyUSB0',
>         baudrate=4800,
>         parity=serial.PARITY_ODD,
>         stopbits=serial.STOPBITS_ONE,
>         bytesize=serial.EIGHTBITS,
>         # timeout=0

That's a slow baud rate, do you mean that slow?

>    )
> 
>    # RTS 0 DTR 1. not sure it's correct one. I tried by reverse.
>    ser.setRTS(False)
>    ser.setDTR(True)

Does your device support hardware flow control?


> 
> 
>    print ser.isOpen()
> 
>    ON="\x1B\x5D"
>    ser.write(ON)
>    ser.flushOutput()
>    print "after write"
>    # read = ser.read()
>    # sys.stdout.write("RECEIVED:" + read + "\n")
>    ser.close()

Try using minicom to see if you can properly connect to your device
first, before trying to write your own code from "scratch", to determine
that the device works.

greg k-h