follow-up-II/Display.md

@@ -2,11 +2,11 @@ A display and a script to show the data of the different sensors were already ad
 
 ## Setup
 
-Use `docker-compose.lcd-monitor.yml` to build and run a Docker container. The docker compose file reuses `Rfid.Dockerfile`. The component could be run without Docker too.
+Use `docker-compose.lcd-monitor.yml` to build and run a Docker container. The docker compose file reuses `Rfid.Dockerfile`. The component could be run without Docker too. SPI needs to be activated on the Raspberry PI if the RFID reader is connected to it.
 
 ## Implementation Basyx
 
-The concept of the implementation is compareable to the one for the light or sensor implementation. An interface ```IDisplay``` as well as the class ```Display``` implementig it are used. The `LcdDisplayController` creates the displays and uses the `DisplaySubmodelProvider` to create, register and upload the AAS as well as host and register the submodules.
+The concept of the implementation is compareable to the one for the lights or sensor implementation. An interface ```IDisplay``` as well as the class ```Display``` implementig it are used. The `LcdDisplayController` creates the displays and uses the `DisplaySubmodelProvider` to create, register and upload the AAS as well as host and register the submodules.
 
 ### General
 
@@ -223,8 +223,15 @@ The text to display is the second entry of the sys argv list. The input should b
 
 ### cycle_lcd.py
 
-This script is the script `display.pi`. Nothing was changed.
+This script is the script [`display.pi`](https://gitlab.hrz.tu-chemnitz.de/vws-demo/vws-spielwiese/-/blob/main/scripts/lcd/display.py). Nothing was changed.
 
+##
+
+For the LCD the follwoing MQTT topics are used:
+```
+display/Lcd_<ID>/<operation>
+```
+where operation can be `text` or `cycle`. If text is used, the message payload needs to contain a text that than is shown on the display. cycle is used for starting the script cycling through the different sensor values.
 
 ## HTTP/REST