I don't know if this idea has any merit or not but I was thinking that if the serial comms could be but into a listen only mode and the display be given an address then you could hang multipal displays of the one comms line.
Any way I am having a lot of fun with the display its making life much easier, thank you for such a great product.
If you need to send commands from only one Nextion, you connect TX from this Nextion to RX on MCU.
In addition you connect RX from MCU to TX on all Nextions.
In this example, the text component t0 exists on the three Nextions, whereas t1, t2 and t3 exist on one Nextion only. Button b2 on Nextion 2 is used to send a command to MCU.
Of course Nextion 2 will send an error message to MCU when MCU sends t1.txt="xx" or t3.txt="xx", since Nextion 2 doesn't have t1 and t3 text components.
NB: I have not tested this solution, it is just a concept.
How many displays is ... most of the displays?
I have an application where I need to monitor and control a small scale off grid power station and I will be using these displays to replace mechanical meters.
Do you only need to send data from the MCU to the displays, or do you also need to send commands from the displays to the MCU?
Not sure which model you have.
Look up Data sheet for your model - says TTL, no?
TTL is an idle high 5V characteristic .. not rs232.
Press Compile - watch Output pane, no?
Global + Page SRAM = Total SRAM for page
TFT File Size given at end of compile
Breakdown at beginning tallied font and pictures
Data sheet for your model says? Model dependent
SRAM can be 3584 Bytes or 8192 Bytes for HMI
Flash space for TFT file can be 4M 16M or 32M
Why would the display emulate serial? Such would be a flakey connection compared when 2 to 3 good hardware ports exist. Flakey connection wouldn't be worth selling. no? ;)
You could consider using a Teensy 3.6 MCU from pjrc.com. It has 6 hardware UARTs on chip which theoretically allows communicating with 6 Nextion displays at the same time.