I have pyserial installed on a Mac Mini (10.4.8) with a Keyspan USB-Serial adapter. Everything is installed correctly, and I can send serial commands in python interactive mode just fine.

But... When I create a script with the same commands, the script does everything else (assigning the port, etc.), but it does NOT actually send the serial string.

The script that is NOT working is root:wheel, has been chmod'd up to 777, and is being run by root. Here it is:


...but of course when I enter python interactive mode, and type the same commands, the ser.write() command sends out the serial like it's supposed to.

Can anyone help me get the script to send the serial?

PS: I'm a python newbie - this is the first thing I've tried with python, but I've done a lot of PHP stuff. I got pyserial installed and had it working in interactive mode in about 10 minutes, but I've spun my wheels on getting the script to work for a day now.

THANKS!

Try changing your first line to:

The "she-bang" line needs to be marked as a comment, which it currently isn't. I'm surprised you aren't getting error messages, though the OS could be smart enough to figure it out.

The rest of your script looks like it should be working. What Python editor are you using? Many of them, such as SPE, let you run the code within the IDE and see if there are any errors.

Additionally, you may also want to look at Google's Python newsgroup. Most of the people on this forum are Python newbies (I've only been using it for a year and I imagine I'm one of the "senior Pythonistas" here).

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Oh, sorry, my shebang line is right in the script, I transposed the first two characters somehow when I was copying and pasting for the post.

SOLVED. I needed to add a time.sleep(0.1) statement after the ser.write() to give the script enough time to do the work before closing.

Does that point to a need to flush the output? Instead of sleep()ing, you could call flush() on it (i.e. ser.flush() )? I'm just guessing here. I've never used pyserial so I don't know it's limitations/features.

Yes, you are correct: ser.flush() also causes the serial command to be sent. This, I'm sure, is a much more appropriate way to use pyserial than using time.sleep().

Thanks,