Configure hardware → Configure failsafe outputs
In the Installation and Hardware Guide (section entitled Danger — Critical Devices), we discussed the issue of wiring the power supply to critical devices (such as intravenous infusion pumps) in a fail-safe manner. One way of doing this is to connect two relays to two output lines, requiring one relay to be on and one to be off before any devices get power.
A circuit for this is given in the Installation and Hardware Guide, together with instructions for configuring failsafe outputs in this dialogue box.
Essentially, you may dedicate lines as failsafes by ticking a 'Use failsafe…' box and filling in the line number you wish to use. You may then specify the state (on/off) that you want the failsafe line to be in when the server is running (i.e. when you want power to your devices) and what state it should be in when the server quits (i.e. when you want power cut off). This line will then be unavailable for clients to use.
See the Hardware Guide for an example of setting up failsafe devices.