与python的串行通信

Question

I'm fiddling a bit with python for serial communication, I have a switch that interacts with a screen and this screen in turn has 2 PCs connected to its HDMI ports, what I want to do is make this switch change from HDMI1 to HDMI2 port what I've been trying looks like this:

import pyserial

connection = serial.Serial(
        'COM1',
        baudrate=9600,
        bytesize=8,
        patity='N',
        stopbits=1
    )

I really believe that the connection is well established, when I do the following connection.is_open the answer is True.

However, I think that my problem is in what is the correct way to compose the chain that sends the commands to the switch through the function connection.write()

• r source! ( Reading the input source at that time )
• s source 1! ( Switch HDMI1 input(1:HDMI1,2:HDMI2, 3:HDMI3,4:DisplayPort,5:VGA/YPBPR/C-VIDEO) )
• s hdmi1 auido 0! ( Choice of audio source as audio input HDMI1 (0: Emb,1: Ext1,2: Ext2,3:Ext3,4:Ext4,5:Ext5) )

I really believe that my real problem is not knowing how to compose the command string that is sent with the function write() other aspect to consider is that I am using python 2.7 and windows.

the truth is that I am a newbie, if you can help me I will be very grateful.

Answer 1

just set a timeout and read until that happens

import pyserial
connection = serial.Serial(
        'COM1',
        baudrate=9600,
        bytesize=8,
        patity='N',
        stopbits=1,
        timeout=1 # could probably be less
    )
# maybe .... are there some docs for whatever switch you are using?
connection.write("r source!\n")
# you might need connection.write(b"r source!")
print(connection.read(1000)) # try and read 1000 bytes or until timeout ocurres(1 sec)
# if you knew what the terminal character the device sends is you could just readuntil that character