DIN

EC-R3576PC supports an optocoupler isolation input, where IN
corresponds to INPUT1 in the hardware schematic diagram and G
corresponds to INPUT_COM in the hardware schematic diagram.

Interface Diagram


schematic diagram


Detect

The "INPUT1" in the schematic corresponds to the "IN" for silk screen
printing, and the "INPUT_COM" corresponds to "G". When "INPUT1(IN)"
and INPUT_COM(G) are conducting, "GPIO3_C0_INPUT" will detect a low
level; When "INPUT1(IN)" and INPUT_COM(G) are disconnected,
"GPIO3_C0_INPUT" will detect a high level.

Example 1: If 'Input (IN)' is connected to 5V, then it is to detect
the input status of 'Input-COM (G)'. When 'Input-COM (G)' is low, the
main control detects that 'GPIO3_C0-INPUT' is low;

*Example 2: If you want to connect to 24V, you need to connect a
resistor (with a resistance value between 3.9K and 4.7K) before
connecting to 'Input (IN)' to prevent burning out the optocoupler
isolation chip. The logic is consistent with Example 1;

Note: It is strongly recommended to use the solution of Example 1. If
you have other configuration ideas, please configure 'Input (IN)' and
'Input-COM (G)' according to the actual circuit schematic to prevent
burning the optocoupler

The Detect mode is as follows：

   # get GPIO export
   echo 112 > /sys/class/gpio/export
   # set direction to input
   echo in > /sys/class/gpio/gpio112/direction
   # read value
   cat /sys/class/gpio/gpio112/value