User Guide

Documentation Number ATxWDT-1303 1
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Chapter 1: GENERAL INFORMATION
Introduction
B&B Electronics' Watchdog Timer (WDT) Cards, Models
ATRWDT and ATXWDT, are hardware devices designed to
overcome the dangers or annoyances associated with a PC "locking
up." Your software periodically resets the WDT. If the watchdog
doesn't receive the reset trigger within a software selectable timeout
period, the WDT resets the computer. The ATRWDT uses the reset
pins from the motherboard to reset the computer, where as the
ATXWDT uses the ATX power supply to turn off the computer then
turn it back on 10 seconds later. A form C relay output is also
provided on both models to reset an external device if desired. This
relay may be set to energize when the timeout is reached, or
energize during normal operations.
Features
• Software selectable timeout period from 0.5 to 512 seconds
• Software enable and disable
• Form C relay output to control external device
• Write back timeout verification
• Reset flag for ATRWDT
• Non-splicing connection to motherboard reset pins for the
ATRWDT
• Non-splicing connection to the ATX power supply for the
ATXWDT
Specifications
Dimensions: 2.6" H x 4.1" L
Address: 0 to 3F8h
Power Consumption: 1.75 W maximum
Output specs: Form C relay output, maximum ratings
24 VDC at 1.0 A
115 VAC at 0.5 A
Connector: DB-9 male