We needed to change the text on a a led panel brought around 7-9 years ago. Hence, long story short, we needed an app for that. The panel has a serial connection. Everything is welded inside a hardcover box. The panel works fine but we need to change the text shown.
Now the thing is, the panel displays temperature taken via a thermometer inside, along with the regular text. I want to receive the text displayed and the temperature, change it in my app then send it back.
Apparently, I can send data after opening serial con as serialPort1.Write(... and read in a similar fashion but I don’t think the panel is meant to send any data. I have no idea what is in the box but I am sure it is the simplest of devices. Will it help if I cut open the box? Are there resources I can read to learn how to read and change the text displayed on a panel through serial connection.
EDIT:
The panel has some kind of storage I suppose, since the text shows without computer connection and even after unplugging.
The text shown might be read from an onboard memory of the microcontroller and you cannot change that through serial, it’s controlled by the code run by the controller.