AST-CAN485 I/O Shield (24V) Hookup Guide
Alex the Giant, Ell C, JamesBM 
Hardware Overview
Input Power
The AST-CAN485 I/O Shield provides a socket to break out all of the IO of the AST-CAN485 board. To make a secure connection to your industrial equipment, screw terminals come pre-soldered to the board to get you up and running in no time. The AST-CAN485 I/O Shield is designed to work in the industrial 24V environment, but has a wide supply input range of 7-24V. The board comes with input reverse voltage protection with a green and red status LEDs (green means power is connected properly, and red indicates reversed power, and blocks power to the rest of the board.
24 I/O Pins
At your disposal are four 24V input channels with LEDs to indicate the input logic level, along with an additional four 24V output channels with matching indicator LEDs.
RS-485 and CAN
Which do you prefer to use for your communication standard: RS-485 or CAN? Well it doesn't matter because as the name indicates, the CAN485 board will handle them both, and they're both broken out to the secure screw terminals as well!
SPI and I2C
If SPI and I2C are more in your wheelhouse, the CAN485 board breaks those out to screw terminals well, but you are limited to 5V logic.
AST-CAN485 Pins
All of the 5V logic level pins of the AST-CAN485 board are also broken out with an easy to read 2x13 pin header.
Pinouts
