Sending serial message in python

Question

I am trying to send this command ":01050801FF00F2" over serial in python 2.7 , with no success. The code that i use is :

import serial, sys ,socket
from time import sleep
port = "COM9"
baudRate = 9600
try:
     ser = serial.Serial(port, baudRate, timeout=1)
     if not ser.isOpen():
            ser.open()
except Exception, e:
   print("Error opening com port. Quitting."+str(e))
   sys.exit(0)
print("Opening " + ser.portstr) 

#this is few ways i am trying to send with
c = '01050801FF00F2'
ser.write(c.encode('utf-8'))
sleep(3)
ser.flushInput() #flush input buffer, discarding all its contents
ser.flushOutput()#flush output buffer, aborting current output
                 #and discard all that is in buffer
c = ':01050801FF00F2'
ser.write(c.encode('hex'))

sleep(3)
ser.write(':01050801FF00F2')

Can you please give add the error log that you are getting.Also have you tried using pyserial — Sachin Janani
– Sachin Janani, Commented Oct 14, 2015 at 13:47
i don't get an error , but the message isn't reached its destination so i assuming something is wrong with my code. (i assuming that because in other language (tcl) it's working) . what is pyserial? — user3903403
– user3903403, Commented Oct 14, 2015 at 14:25
oh my bad i havent look at the code properly that you are already using pyserial package of python.can you try adding this line at the end - ser.close().Also remove flushOutput because it is closing the connection — Sachin Janani
– Sachin Janani, Commented Oct 14, 2015 at 14:38
Also have you tried removing the flushOutput and flushInput lines from code? — Sachin Janani
– Sachin Janani, Commented Oct 15, 2015 at 4:40

J. P. Petersen · Accepted Answer · 2015-10-15 12:13:54Z

1

If those are hex values, this should work:

c = '\x01\x05\x08\x01\xFF\x00\xF2'
ser.write(c)

answered Oct 15, 2015 at 12:13

J. P. Petersen

5,0516 gold badges36 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

skyhammer · Accepted Answer · 2015-10-15 07:30:48Z

0

Have you tried sending the command using bytearray?

Perhaps you could try:

ser.write(b':01050801FF00F2')

or

ser.write(':01050801FF00F2'.encode())

answered Oct 15, 2015 at 7:30

skyhammer

1171 silver badge7 bronze badges

Collectives™ on Stack Overflow

Sending serial message in python

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related