On this occasion I made our arduino communication with HMI Panasonic GT01 monochrome display via RS232 Modbus RTU, Arduino screen as Master and slave.
1 The value of the ADC 0 of arduino from a potentiometer 100 k will be displayed on the HMI Panasonic
2 The value entered from a keypad from the HMI was displayed from the arduino oled screen.
one Max232 physical is required for communication between the Arduino and the Panasonic screen
Arduino is configured for reading and writing 10 log 10 records.