Python Serial Read Example
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Python Serial Read Example Pdf
I am trying to establish a two-way communication via Python3. There is a laser range finder plugged into one of my USB ports and I'd like to send/receive commands to that. I have a sheet of commands which can be sent and what they would return, so this part is already there.
What I need is a convenient way to do it in real-time. So far I have the following code:
So in the above code I am sending '1' which should trigger 'getDistance()' function of the laser finder and return the distance in mm. I tried this on Putty and it works, returns distances up to 4 digits. However, when I launch the above Python script, my output is only the following:
and it goes forever. There is no read data or whatsoever.
Where am I mistaken?
SchützeSchützePython: Writing to and Reading from serial port. A piece of code who work with python to read rs232 just in case somedoby else need it. Serial python to. Mar 27, 2017 Using pyserial to read real time data from sensor cause 100% CPU usage #216.
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Now, let's examine the functionality, up close.TestWe will examine the problem in Linux.
3 Answers
Apparently much more simpler version of the code solved the issue.
Output, as desired:
SchützePython Serial Read Example Free
SchützeIt seems to me that your ser.timeout = None may be causing a problem here. The first cycle of your while loop seems to go through fine, but your program hangs when it tries ser.readline() for the second time.
There are a few ways to solve this. My preferred way would be to specify a non-None timeout, perhaps of one second. This would allow ser.readline() to return a value even when the device does not send an endline character.
Another way would be to change your ser.readline() to be something like ser.read(ser.in_waiting) or ser.read(ser.inWaiting()) in order to return all of the characters available in the buffer.