B&B Electronics ATRWDT, ATXWDT User Manual

PC Watchdog Timer Card CE

Models: ATRWDT and ATXWDT

Documentation Number ATxWDT-1303

This product designed and manufactured in Ottawa, Illinois USA

of domestic and imported parts by

International Headquarters

B&B Electronics Mfg. Co. Inc.

707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA

Phone [phone] -- General Fax [phone]

Home Page: www.bb-elec.com

Sales e-mail: [e-mail]

Technical Support e-mail: [e-mail]

European Headquarters

B&B Electronics Ltd.

Westlink Commercial Park, Oranmore, Co. Galway, Ireland

Phone [phone] -- Fax [phone]

Home Page: www.bb-europe.com

Sales e-mail: [e-mail]

Technical Support e-mail: [e-mail]

-- Fax [phone]

-- Fax [phone]

 B&B Electronics -- Revised March 2003

Documentation Number ATxWDT-1303 ATRWDT & ATXWDT Cover Page

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]

Table of Contents

CHAPTER 1: GENERAL INFORMATION...................................1

I

NTRODUCTION..................................................................................1

F

EATURES..........................................................................................1

S

PECIFICATIONS ................................................................................1

CHAPTER 2: SETUP AND INSTALLATION...............................2

I

NSPECTION .......................................................................................2

A

DDRESS SWITCH SETUP ..................................................................2

R

ELAY SETUP....................................................................................5

I

NSTALLATION...................................................................................5

C

ONNECTING THE ATRWDT MOTHERBOARD RESET OPTION.........6

C

ONNECTING THE ATX RESET OPTION FOR THE ATXWDT............7

I

NSTALLING THE SOFTWARE .............................................................7

CHAPTER 3: OPERATION.............................................................9

C

OMMUNICATING WITH THE WDT....................................................9

P

INOUTS ..........................................................................................10

CHAPTER 4: SOFTWARE........................................................... 13

W

INDOWS NT AND WINDOWS 95...................................................13

Changing the I/O Port Address..................................................14

Disk Caching..............................................................................14

Existing DOS Programs.............................................................14

W

INDOWS 3.11................................................................................14

Changing the I/O Port Address..................................................15

Disk Caching..............................................................................15

C

OMMAND REFERENCE...................................................................16

BBPCWDT_Startup....................................................................16

BBPCWDT_Shutdown................................................................16

BBPCWDT_Reset.......................................................................17

BBPCWDT_ReadRegister..........................................................18

APPENDIX A: HARDWARE I/O MAPS...................................A-1

APPENDIX B: QUICKBASIC EXAMPLE................................ B-1

APPENDIX C: DECLARATION OF CONFORMITY............ C-1

Documentation Number ATxWDT-1303 Table of Contents i

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

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 2: SETUP AND INSTALLATION

Inspection

Your WDT has been tested for proper operation. It should be in
perfect electrical and mechanical condition upon receipt.

Remove the card from its protective packaging. Handle the card
only by its edges being careful not to touch the gold connection
fingers. Save the packaging for storage or shipping if the card needs
repair.

Address Switch Setup

The WDT can be set for any I/O address using a seven position
DIP switch to program the binary I/O address of the card. Figure 1 is
a drawing of the printed circuit board showing the locations of the
address switch and setup jumpers on the WDT.

2 Documentation Number ATxWDT-1303

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]

Figure 1. ATRWDT/ATXWDT PCB Silk Screen

Documentation Number ATxWDT-1303 3

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]

Switch positions 1 - 7 of S1 configure the I/O address of the
WDT. Switches represent a binary 0 in the ON position, a binary 1
when OFF. Least significant bit (LSB) and most significant bit (MSB)
are labeled on the card. Table 1 shows the numerical weight and
electrical connection of each switch.

Table 1. Address Switches

S1 Position 7 6 5 4 3 2 1
Bus

SA9 SA8 SA7 SA6 SA5 SA4 SA3

Connection
Decimal

512 256 128 64 32 16 8

Weight
Hex Weight 200 100 80 40 20 10 8

Any I/O address may be used, but it is important that no other
device in the host computer use that address. Table 2 is a list of
frequently unused I/O addresses. In most cases, the WDT can be
set to one of these addresses.

Table 2. Frequently Unused Port Addresses

Base Hex

Address

Binary

Equivalent

Switch

Settings

MSB LSB

I/O Space

Description

200 1000000000 1000000 game port
208 1000001000 1000001 game port
300 1100000000 1100000 prototype
308 1100001000 1100001 prototype
310 1100010000 1100010 prototype
318 1100011000 1100011 prototype
380 1110000000 1110000 SDLC

388 1110001000 1110001 SDLC
3A0 1110100000 1110100 bisync comm
3A8 1110101000 1110101 bisync comm

4 Documentation Number ATxWDT-1303

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]

If you want to install at another address, use the following

procedure.

1. Select the address: Using an I/O port usage table (one is
included in Appendix A) select an unused hex address space.
Note that the WDT card occupies 8 bytes of I/O space. Use
caution when selecting a port address, it is important that
nothing else is installed at the selected address.

2. Convert the hex address to its binary equivalent.

3. Throw away the 3 least significant bits.

4. The remaining 7 digits represent the switch address. 1's
represent an OFF switch. 0's represent an ON switch.

Relay Setup

The jumper labeled

the external reset to be configured. With the jumper in the

RELAY NORMALLY

provides two ways for

0

position,

the relay will normally be discharged, and will energize after the

1

timeout is reached. In the

position, the relay will be energized while
the timer is running. The relay will discharge after the timeout is
reached, the timer disabled, or the power is turned off.

Installation

1. Turn the power to your computer off and unplug from the power

outlet.

2. Remove the cover of the computer.

3. Pick an unused ISA slot. The WDT will work in a short (8-bit) or

full length (16-bit) slot.

4. Remove the expansion ISA slot cover. Save the screw for

installation of WDT.

5. Install the WDT into the unused ISA slot. Be certain that the card

is inserted completely into the slot.

6. Secure the card with the mounting screw.

Documentation Number ATxWDT-1303 5

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]