Python Serial Timeout

I am writing a Python v3.6.0 program on a Windows PC that takes an input from the Serial port and then parses the input, and replies on the Serial port based on the input. I tied COM1 and COM2 together. My Python script running is connected to COM1 and the Arduino serial monitor connected to COM2. I'm writing a driver in Python for an old fashioned piece of serial equipment. Currently I'm using the USPP serial module. From what I can see all the serial modules seem to set the timeout when you open a serial port. This is not what I want to do. I need to change the timeout each time I do a 'read' on the serial port, depending on. Python serial port access library. Contribute to pyserial/pyserial development by creating an account on GitHub.

1. Serial Readline Python
2. Python Serial Inwaiting Timeout
3. Python Serial Timeout Update
4. Python Serial Timeout Not Working

Welcome to pySerial’s documentation¶. This module encapsulates the access for the serial port. It provides backends for Python running on Windows, OSX, Linux, BSD (possibly any POSIX compliant system) and IronPython.

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I am trying to communicate between a pair of RPi's both with Ciseco XRF Radios on Slice of Pi's.

My end goal is for RPi1 to send a specific phrase to RPi2 which will pick it up, perform some actions(collecting data from some sensors) and send a response; I figured serialport.read/write is the best way to do this.

I'm working on the very basic stage of this which is simply RPi2 listening to the serial port and printing whatever it recieves. My code is as follows:

I can run this fine and it picks things up that I type/paste into RPi1 but not reliably; for example if I paste 'hello world' into the terminal on RPi1 I get:

appearing at RPi2. If I add a time delay (time.sleep(3) for example) I get nothing. My guess is that it is only picking up data if it is sent at the same time as it is reading.

Is there some way to reliably read everything that comes out of the serial port? (Maybe RPi2 store the input somewhere and read everything since its last read or something.)

1 Answer

You should not re-create the object Serial at each iteration of the loop. I suppose that the line serialport = serial.Serial('/dev/ttyAMA0', 9600, timeout=0.5) closes and re-opens the serial port, flushing all the buffers.

Serial Readline Python

Try this :

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I would like to read from the USB serial port from time to time in a loop.I can open the port and read data with:

import serial

ser = serial.Serial('/dev/ttyACM0', 9600)

while 1 : ser.readline()

An Arduino Uno is connected to the USB port of the RPi.The Arduino acts as a sensor and it will constantly produce readings.

I need some help in adding timing features to the above code.I want to open the port and read from it for a certain period of time. After that period of time, the port closes and the received data will be analysed.After a pause of several minutes, the port will reopen and the RPi will read data from it again.This continues in a loop.Any help is much appreciated.

Python Serial Inwaiting Timeout

2 Answers

Python Serial Timeout Update

All you would need to add, aside from closing the port when you're done ;), is import time and then use time.sleep(secs):

I don't know if pySerial is buffered (data sent while sleeping is stored or simply dropped), but I usually prefer to use a generator, if you don't explicitly need to wait. They seem a bit more flexible (in my opinion):

You might also be able to use the with syntax instead of the while, but I'm not too sure how that'd work with pySerial.

Please download the Serial Library and install in Python Lib Folder. Then use the following script. Please modify loop to your requirements. The sys.argv[] are used for seeking Params at command line. You may omit this and hardcode as per your requirement.

Python Serial Timeout Not Working

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