AST-CAN485 I/O Shield (24V) Hookup Guide

Contributors: Alex the Giant, Ell C, JamesBM

Hardware Hookup

The AST-CAN485 I/O shield comes with female headers pre-soldered. Insert the CAN485 as shown with the FTDI header close to the input power pins:

Powering The Shield

The shield requires 24V power in order to function correctly. This can be supplied on any of the power terminals as shown below. Additional terminals are provided to allow powering of external devices.

There is reverse voltage protection on the 24V power terminals. The power status LED will show green for correctly wired power. If wired incorrectly, the LED will be red.

An integrated power supply regulates the 24V input power down to 5V which is used to provide power to the inserted CAN485 board. This 5V supply is also broken out to the terminals as shown.