Hello I want to ask, can we connect arduino mega with HMI (human machine interface) such as HMI brand Siemens, Delta, Omron and others to display data from arduino?
It could work as long as the specification of the HMI interface is known.
You must read the specifications of those HMIs and learn how to communicate with Mega.
For example, some of them communicate with RS232 and you should convert those signals to TTL for Arduino Mega2560.
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