Serial RS232 connections in Python

Hi Fabio,
Thanks for this great script, that helped me really alot.
I sill have one question though; how can i stream or send files (images etc..) between two modules? I am using telegesis zigbee kit. And how do i prepare a transmitter (coordinator) and receiver (node)?

I would appreciate any help,

thanks in advance
lekaleka

Using your example, the port was opened for communication. When I send some input commands, I get the same as output

The sample code shouldn't work because the same port is opened twice: first with [ ser = serial.Serial( port='/dev/ttyUSB1', ... ] then again with the statement [ ser.open() ].

hi
am new to python and i want to build a sms app that can receive and send
feed back to user. I need a help to build my app
thanks

Knowing this is an old post, but an useful tip:
We can use the 'cmd' module to implement a command line interface with many commands. Easy to use and fun ^_^

Hello,
Thank you for your handy topic, it helps me to create a conection between my computer and a AC/DC alimentation.
One of your function doesn't work with my programm. I can't catch message/error from my device.
ser.inWaiting() always return 0.
Is there a way to configure the parameters of the device output register ?
Thanks for your help.

Olivier.

hello. i am also working in python 2.6 and i want to send SMS to a mobile while my cell phone i.e. Nokia E-72 is connected to PC via Data Cable. the mobile is connected through the serial port and the code prompts the correct port as well and there is no error in the code but still the message is not being sent... please help me.
My code is as follows:

import serial
import time

phone = serial.Serial()
phone.baudrate = 38400
phone.bytesize = 8
phone.stopbits = 1
phone.xonxoff = 0
phone.rtscts = 0
phone.timeout = 0
phone.port = 4 #try different ports here, if this doesn't work.
phone.parity=serial.PARITY_NONE
phone.open()
print phone.portstr

recipient = "+923219409998"

message = "We did it!"
try:
time.sleep(0.5)
phone.write(b'ATZ\r')
time.sleep(0.5)

phone.write(b'AT+CMGF=1\r')
time.sleep(0.5)
phone.write(b'AT+CMGS="' + recipient.encode() + b'"\r')
time.sleep(0.5)
phone.write(message.encode() + b"\r")
time.sleep(0.5)
phone.write(bytes([26]))
time.sleep(0.5)
phone.readall()

# print phone.readall(str)

finally:
phone.close()

It was very clever of you to use python. I like it a lot. It is quite simple. When I learned it tthis book helped me a lot: http://www.pdfok.com/watch/Python-Programming-on-Win32.pdf-20458046.html . You can download it from here. Well, whenever I had any question I always look in it for the answer. I'm sure it can be of some help to you too.

I downloaded the latest and the greatest pyserial and pywin32 for windows. I installed and re-installed. Nothing is working for me. Every time I go to install, pywin32 complains that it can't find the right version, when in fact I verified that the correct version is installed.

Every time I compile my code with
import serial

I get importerror: module named serialwin32 not found....

any idea.....

The last version of pywin32 extension I can find is 2.6

Any idea?

Thanks for your help.

Hi everybody!

I am with a problem when I trying to communicate a bluetooth device using Pyserial and AT commands. I can´t connect a bluetooth device with serial module from Python, my script is very simple and it works directly on hyperterminal by windows. I posted my code below if someone has any hit I would appreciate. Thanks in advance.

import serial
ser = serial.Serial(2) # open first serial port
print ser
print ser.portstr # check which port was really used
ser.write("atd000195079CEA\n\r") # write a string

ser.write("123test")

Hi Fablo,

may i ask why you put input=1?

thanks

jaro

Hi!

I'm trying to do a very similar thing to what you demonstrate here, except I'd like to print out the numerical value of the char instead of the ascii equivilent. Whenever I send a char from the dsPIC33 to my pc through serial,

print x

works fine,

but print int(x, 16)

gives me an error because the input has a /x in front (/xFF for example) and the python doesn't like that. Any ideas how I print out the actual int instead of the ascii?

Thanks!
Stace

One note:
If the communication mostly works, but after a few seconds fails again, it may be that there is a getty (terminal) server listening on the serial port, eating part of your communications.

To test this, run as root:
# fuser -v /dev/ttyS0

USER PID ACCESS COMMAND
/dev/ttyS0: root 3576 F.... getty

(with /dev/ttyS0 the port you are using). If getty is running, remove from /etc/inittab a line looking like this:
T0:2345:respawn:/sbin/getty -L ttyS0 115200 vt100

and reboot server (just 'kill -SIGHUP 0' doesn't seem to work)

Hello Fabio,

I've used your Python code to monitor a device I have. I'm a very inexperient Python user, in fact I have no experience at all. This might seem a silly question but I just want to know I do alter the code to supress the need of entering the ENTER key over and over. I think don't need the sleep function because my device already enters in sleep mode and I'm looking for a continuos reading, so I intend to press ENTER only one time and let the readings flow. Is that possible? Can you tell me how?

Thanks in advance,
Pedro.

Thank You! It is really awesome! I could resuscitates and gain control over my telescope mount with pyserial. It is the power of Python.

That's awesome!!! I was sooooo close to getting mine working, and this helped me get serial comms working. I'm communicating with a propeller chip. Thank you!