On Jun 11, 2010, at 8:08 AM, Dan Ackerman wrote:
> Hello,
> I need to be able to send some information through my computer's serial port.
> I am using python version 2.6, the pyserial 1.21 module, and the pywin
> module. My code seems to be sending info somewhere, because any print
> statement I add after the import serial command doesn't show up in my
> terminal window. However, the device connected to my serial port doesn't seem
> to be registering any received information. I want to send the string "FREQ
> 720 MHz."
>
> If anyone could help me out with this code, it would be greatly appreciated:
>
> import serial
> ser = serial.Serial(0) #if port has specific name, use: ser =
> serial.Serial('portName', 19200, timeout=0)
> print ser.portstr #should tell you what specific port was used
> ser.write('FREQ 720 MHz')
> ser.close()
Dan,
In my experience connecting to a serial port does not cause prints to stop
sending to stdout. My guess is that ser.portstr is an empty string or None.
Try printing this instead to test that theory:
print 'portstr: "%s"' % (ser.portstr,)
My bet is you get: portstr: ""
Secondly, what COM port are you connecting to? If, for example, you're
connecting to COM1 and the baud rate is 19200, try this:
ser = serial.Serial('COM1', 19200, timeout=0)
Finally, highly dependent on the device you are sending data to, maybe you're
missing a newline or something at the end of the string you are sending?
ser.write('FREQ 720 MHz\n')
Good luck,
-Roberto.
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