B & B ELECTRONICS

ATRWDT, ATXWDT

Card Type

Watchdog timer card

Chip Set

None

Maximum Onboard Memory

Unidentified

I/O Options

Serial port

Hard Drives supported

None

Floppy drives supported

None

Data Bus

16-bit ISA

Card Size

Full-length

CONNECTIONS

Function

Label

Function

Label

9-pin serial port

J2

Reset button connector

J4

Motherboard reset connector

J3

ATX power supply connector

ATX

USER CONFIGURABLE SETTINGS

Function

Label

Position

Normal relay enabled

JP1/A-B

Pins 1 & 2 closed

Timer relay enabled

JP1/A-B

Pins 2 & 3 closed

Note: If normal relay is enabled, the relay will discharge normally and will energize after the timeout is reached. If timer relay is enabled, the relay will be energized while the timer is running and discharge after the timeout is reached, disabled, or the power is turned off.

BASE I/O ADDRESS SELECTION

Setting

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

SW1/7

000h

On

On

On

On

On

On

On

008h

Off

On

On

On

On

On

On

010h

On

Off

On

On

On

On

On

018h

Off

Off

On

On

On

On

On

020h

On

On

Off

On

On

On

On

3D8h

Off

Off

On

Off

Off

Off

Off

3E0h

On

On

Off

Off

Off

Off

Off

3E8h

Off

On

Off

Off

Off

Off

Off

3F0h

On

Off

Off

Off

Off

Off

Off

3F8h

Off

Off

Off

Off

Off

Off

Off

Note:

A total of 128 base address settings are available. The switches are a binary representation of the decimal memory addresses. SW1/7 is the Most Significant Bit and switch SW1/1 is the Least Significant Bit. The switches have the following decimal values: SW1/7=512, SW1/6=256, SW1/5=128, SW1/4=64, SW1/3=32, SW1/2=16, SW1/1=8. Turn off the switches and add the values of the switches to obtain the correct memory address. (Off=1, On=0)

MISCELLANEOUS TECHNICAL NOTES

To enable the ATR version of the watchdog timer card to reboot the main board, they must be connected. The mother board reset connector on the watchdog timer card can be connected to the reset pins on the main board or the reset button connector of the watchdog timer card can be connected to the jumper wires of the main board’s reset switch.