- On-board Watchdog Timer
- Power rail monitoring
- Isolated digital input
- Digital and Relay output
- Monitors ‘hot spots’ in computer system using remote temperature sensor
- On-board audible alarm
- All functions selectable under software control
- I/O connections via two part screw terminal on the end bracket
- Fully PCI and Plug-and-Play compliant
- Supplied with demonstration software examples
- Drivers for Windows® 2000 and Windows NT® available separately
The PCI-WD is a PCI-compatible half-card which provides system monitoring of system power supplies, fan operation, system temperature and Processor activity and generates alarm functions in the event of a system malfunction. The heart of the system monitoring is performed by the National Semiconductor LM78 IC. This highly integrated devices performs the supply, fan and temperature monitoring circuits as well interrupt generation. Three fan speed counter circuits provide a warning to the system that fans are operating out of specification. Four PCI power rails ( +3.3V, +5V, +12V and -12V) can be monitored for over and under voltage excursions. In the event of the rails drifting out specification the system is notified. A programmable watchdog timer facilitates monitoring of application software execution. The timer is software selectable between 1 and 255 seconds. The PCI-WD has an onboard temperature monitor to notify the system that temperature within the PC enclosure has risen past a prescribed level. In response to any of the above monitoring circuits detecting an error or change in condition, the system can generate a number of responses including activating a relay, activating an on board audible alarm, illuminating an LED or resetting the system. Each of the above responses can be enabled and disabled under software control.
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