For I²C mode, run `cfnet-fs` as shown below:

cfnet-fs {mount-point} {i2c1-device} {i2c2-device} {i2c3-device}

For the ModularPi:

cfnet-fs /tmp/cfnet-fs /dev/i2c-0 /dev/i2c-1 /dev/i2c-3

• mount-point can be any directory the user running the program has access to.
• /dev/i2c-0 is the I²C port for analog modules
• /dev/i2c-1 is the I²C port digital input modules
• /dev/i2c-3 is the I²C port digital output modules

The ModularPi must have the following in its /boot/firmware/config.txt file for the I²C ports to work.

[pi5]
pciex1=on
dtoverlay=uart0-pi5
dtoverlay=uart4-pi5
dtoverlay=i2c0-pi5,pins_8_9,baudrate=100000
dtoverlay=i2c1-pi5,pins_2_3,baudrate=1000000
dtoverlay=i2c3-pi5,pins_22_23,baudrate=1000000

NOTE: I²C port 0 can also be configured for 1MHz, if you are only using CFADC-A4L and CFDAC-2V modules on that port.