note: This is a follow up post from 2015-07-21-rcd-stonith
A Linux Cluster Base STONITH provider for use with modern Pacemaker clusters
This has since been accepted and merged into Fedora’s code base and as such will make it’s way to RHEL.

Source Code: Github
Diptrace CAD Design: Github
I have open sourced the CAD circuit design and made this available within this repo under
CAD Design and Schematics
Related RedHat Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1240868

v1 vs v2/v3 versions of the rcd_serial STONITH system
The v2/v3 cables include the following improvements:

Sam McLeod

An update on the rcd_serial STONITH provider for Linux Pacemaker clusters, covering hardware design improvements in v2/v3 cables. The project has been accepted into Fedora's codebase and will eventually land in RHEL. Key improvements include an external connector for easier cable disconnection, a refined circuit design, and fixed RS232 connector screws. The CAD circuit design has been open-sourced on GitHub.

Update Delayed Serial STONITH Design

A Linux Cluster Base STONITH provider for use with modern Pacemaker clusters #