Urgent:Serial Port Read/Write

[Frank Miles]

On Thu, 09 May 2013 23:35:53 +0800, chandan kumar wrote:

> Hi all,I'm new to python and facing issue using serial in python.I'm
> facing the below error
>     ser.write(port,command)NameError: global name 'ser' is not defined
> Please find the attached script and let me know whats wrong in my script
> and also how can i read data from serial port for the  same script.
[snip]
> if __name__ == "__main__":
>     
>     CurrDir=os.getcwd()
>     files = glob.glob('./*pyc')
>     for f in files:
>         os.remove(f)
>     OpenPort(26,9600)
>     SetRequest(ER_Address)
>     #SysAPI.SetRequest('ER',ER_Address)
> 
>     print "Test Scripts Execution complete"

What kind of 'port' is 26?  Is that valid on your machine?  My guess is 
that <ser> is NULL (because the open is failing, likely due to the port 
selection), leading to your subsequent problems.

HTH..