Virtual Serial Device in Python?

python serial-port pyserial virtual-serial-port
tdavis picture tdavis · Feb 18, 2010 · Viewed 37.2k times · Source

I know that I can use e.g. pySerial to talk to serial devices, but what if I don't have a device right now but still need to write a client for it? How can I write a "virtual serial device" in Python and have pySerial talk to it, like I would, say, run a local web server? Maybe I'm just not searching well, but I've been unable to find any information on this topic.

Answer

Aquiles picture Aquiles · Feb 26, 2013

this is something I did and worked out for me so far:

import os, pty, serial

master, slave = pty.openpty()
s_name = os.ttyname(slave)

ser = serial.Serial(s_name)

# To Write to the device
ser.write('Your text')

# To read from the device
os.read(master,1000)

If you create more virtual ports you will have no problems as the different masters get different file descriptors even if they have the same name.

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