IO¶

Definition¶

Module - Core-3588SJD4-AI¶

Phoenix terminal pin definition

GND	485A	485A	GND	CAN_H	485A
12V	485B	485B	GND	CAN_L	485B
	/dev/ttysWK2 re-de pin：GPIO122	/dev/ttysWK1 re-de pin：GPIO35			/dev/ttysWK0 re-de pin：GPIO34

RS232 Interface Definition

UP	/dev/ttyS9
DOWN	/dev/ttyS6

Module - Core-3576JD4¶

Phoenix terminal pin definition

GND	485A	485A	GND	CAN_H	485A
12V	485B	485B	GND	CAN_L	485B
	/dev/ttysWK2 re-de pin：GPIO119	/dev/ttysWK1 re-de pin：GPIO98			/dev/ttysWK0 re-de pin：GPIO99

RS232 Interface Definition

UP	/dev/ttyS8
DOWN	/dev/ttyS3

RS485 RE-DE PIN USE¶

For example, to operate 122, you need:

Export the GPIO, run as root user:
```
echo 122 > /sys/class/gpio/export
```

Operate GPIO, set to read input or output specified value:

cd /sys/class/gpio/gpio122

# Set GPIO output mode
echo out > direction
# GPIO outputs low level, RS485 is set to data receiving mode
echo 0 > value
# GPIO outputs high level, RS485 is set to data receiving mode
echo 1 > value

There are a few things to note:

If the GPIO has been applied by other drivers, it cannot be exported successfully, and subsequent read and write operations cannot be performed.
Involving the multiplexing of IO functions, if the function of the pin is already GPIO, the above method can be used; otherwise, the pinctrl state must be specified in the device tree.