This is the command to control Four Relays four Inputs 8-Layer Stackable Card for Raspberry Pi
Don't forget to enable I2C communication:
~$ sudo raspi-config
~$ git clone https://github.com/SequentMicrosystems/4relind-rpi.git
~$ cd 4relind-rpi/
~/4relind-rpi$ sudo make install
Now you can access all the functions of the card through the command "4relind". Use -h option for help:
~$ 4relind -h
If you clone the repository any update can be made with the following commands:
~$ cd 4relind-rpi/
~/4relind-rpi$ git pull
~/4relind-rpi$ sudo make install
Diferent software interfaces and examples are available: