SmartThings Integration With Home Security

Firmware depends on the manufacturer of your alarm panel. Ademco for Ademco/Honeywell and DSC for DSC. For specific installation questions on this product you should consult Alarm Decoder’s website:
http://www.alarmdecoder.com/catalog/product_info.php/products_id/39

At the bottom you will see links to their FAQ and Getting Started sections on their Wiki and they have their own support channels as well including: ad2usb@support.nutech.com

There is also a specific thread on the network appliance here for others ST users who own it. Kevin from Alarm Decoder/Nutech addresses questions on the ST forum from time to time
https://community.smartthings.com/t/alarmdecoder-ad2pi-network-appliance?source_topic_id=91365