We use a normal switch button state 0 and state 1, now we switch button to 1, power lost on display. When display get new power, display boots(starts) then is button state 0,,, but we need after power up state 1... latest state after power lost.
Actually, that is name of industrial hmi panels power drop hold function. Means when switch it to "ON" and then power lost and display boot again then state is "OFF". Wanna remember the last state of button.
if need this function of your hmi project, kindly use types RW address, which is power down holding register. Means All RW register are power-down holiding registers and can be used directly. Kindly reference the right picture to show.
MOCHUAN DRIVES HMI support the size from 4.3inch to 32inch with multi-optional in parameter to meet different customer and project to require.
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