Serial COM with three window

Targets Windows
1

I opened several posts two days ago to explain and solve my problem. I noticed that I got on a complicated road and I changed my way.

I have created a program for serial communication between one and more objects through commands.

I have this setting here:

  1. I have a main window for choosing the COM, 4 text area to fill them in with the address of the device I want to communicate and next to them, I have 4 buttons to open a new page for each device.
  2. When I choose a device, a dedicated window opens where I have 4 buttons to send ON / OFF and a screen that I receive the command.

My question is this: instead of using methods, I am using a Serial object for each window. How can I set the choice of COM only in the main window and not in the secondary windows?

2

Separate the Serial object from the Window.

Add a Module to the project.
Add a property of type Serial to the module.
Instantiate a serial object in App.Open and assign it to the property.
Use the property in all your windows.

3

I have this :

How do I set up the Serial?

4

should be your device address filter not in the window with the on/off buttons?
for me it seems this filter is part of a protocol.