To simplify accessing I/O when you write your own code, Opto 22 engineers wrote a Python script that your code can reference.

  • If you’re using a browser, click here for the script.

  • To download the script to the current directory using a terminal, enter wget

The script references an I/O module’s rack position to read and write to its point, and to configure its associated GPIO pin. It also contains comments to help you understand what it does.


How to run

Open a terminal, and then run the script using this syntax:

sudo python [module number] [command] [value]

  • [module number] : Rack position of the target I/O module (0 through 15).
  • [command] :
    • blink makes the GPIO pin blink.
    • config configures the I/O module's associated GPIO pin as either input or output.
    • read reads the status of the I/O point.
    • write turns an output point On or Off.
  • [value] :
    • If [command] is blink, for [value], type the number of seconds to blink. The minimum value is 2 (blink on for 1 second; blink off for 1 second).

    • If [command] is config, [value] is input or output.
      You must configure the GPIO pin to match the I/O module's type.
      • If the GPIO pin is mapped to an input module, enter input for the value.
      • If the pin is mapped to an output module, enter output for the value.
    • If [command] is read, you don't need the [value] argument. Leave it blank.

    • If [command] is write, [value] is 1 for On or 0 for Off.

Examples for LXTerminal

Configure the GPIO pin mapped to rack position 0 as input

sudo python 0 config input

Read the I/O module at rack position 3

sudo python 3 read

Turn Off the I/O module at rack position 15
(Remember that in, 1 = On and 0 = Off)

sudo python 15 write 0

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