
3. Installation
3.3. Critical Alarm Relay
The Critical Alarm output relay signals critical error conditions that may occur on the RuggedBackbone™ RX5000. The contacts are energized upon 
| Norm ally | 
| Closed | 
| Com m on | 
| Norm ally | 
| Open | 
| Pin | Function | 
| NC | Normally Closed | 
| 
 | 
 | 
| Common | Ground | 
| 
 | 
 | 
| NO | Normally Open | 
| 
 | 
 | 
Table 3.2. RX5000 Critical Alarm Relay Connector Pinout
Figure 3.16. Critical Alarm Relay Connection
A common application for this output is to signal an alarm in case of a power failure.
| RuggedCom® RuggedBackbone™ | 25 | RX5000 Installation Guide Rev106 | 
