ICS PCI-WDT50 Series User manual

Model PCI-WDT 500/501
Product Manual
MANUAL NUMBER : 00650-144-1B

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FOREWORD
This product manual provides information to install, operate and or program the referenced product(s)
manufactured or distributed by ICS Advent. The following pages contain information regarding the
warranty and repair policies.
Check our Web site (www.icsadvent.com) for technical information, manuals, and BIOS updates.
Technical assistance is also available at: 800-480-0044 (U.S.) or 858-677-0877 (international).
Customer Comments: If you experience any problems with this manual or just want to provide some
feedback, please send us a message using the online "Service Form" on our Web site (www.icsadvent.com)
under "Support." Detail any errors you find. We will correct the errors or problems as soon as possible and
post the revised manual in our online Support Library. Thank you.
The information in this document is provided for reference only. ICSAdvent does not assume any liability
arising from the application or use of the information or products described herein. This document may
contain or reference information and products protected by copyrights or patents and does not convey any
license under the patent rights of ICS Advent, nor the rights of others.
Copyright © 1998, a California Corporation, 6260 Sequence Drive, San Diego, CA92121-4371. ICSAdvent
is a Registered Trademark of ICS Advent. All trademarks and registered trademarks are the property of
their respective owners. All rights reserved. Printed in the United States of America. No part of this publi-
cation may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, elec-
tronic, mechanical, photocopying, recording , or otherwise, without the prior written permission of the pub-
lisher.

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Shipments not in compliance with this Guarantee
and Limited Warranty Return Policy will not be ac-
cepted by ICS Advent.
Guarantee
A thirty day money-back guarantee is provided on all standard products sold. Special order products are
covered by our Limited Warranty, however they may not be returned for refund or credit. EPROMs,
RAM, Flash EPROMs or other forms of solid electronic media are not returnable for credit - but for
replacement only. Extended Warranty available. Consult factory.
Refunds
In order to receive a refund on a product for the purchase price, the product must not have been
damaged by the customer or by the common carrier chosen by the customer to return the goods and
the product must be returned complete (meaning all manuals, software, cables, etc.) within 30 days of
receipt and in an as-new and resalable condition. The Return Proceduremust be followed to assure
prompt refund.
Restocking Charges
Product returned after 30 days, and before 60 days, of the purchase will be subject to a minimum20%
restocking charge and charges for any damaged or missing parts. Products not returned within 60
days of purchase, or products which are not in an as-new and re-saleable condition, are not eligible
for credit return and will be returned to the customer.
Limited Warranty
Effective April 1, 1998, all products carry a 2-year limited warranty. Within two years of purchase,
ICS Advent will repair or replace, at our option, any defective product. ICS Advent will service the
warranty for all standard catalog products for the first two years from the date of shipment.
Please note: The 2-year warranty may not apply to special promotion items. Please consult the factory for
warranty verification.
The limited warranty is void if the product has been subjected to alteration, neglect, misuse, or abuse; if any
repairs have been attempted by anyone other than ICS Advent or its authorized agent; or if the failure is
caused by accident, acts of God, or other causes beyond the control of ICS Advent or the manufacturer.
Neglect, misuse, and abuse shall include any installation, operation, or maintenance of the product other than
in accordance with the user’s manual.
No agent, dealer, distributor, service company, or other party is authorized to change, modify, or extend the
terms of this Limited Warranty in any manner whatsoever. ICS Advent reserves the right to make changes
or improvements in any product without incurring any obligation to similarly alter products previously
purchased.

Page - vi
Return Procedure
For any Guarantee or Limited Warranty return, please contact ICS Advent's Customer Service at
800-480-0044 (U.S.) or 858-677-0877 (international) and obtain a Return Material Authorization (RMA)
Number. All product(s) returned to ICS Advent for service or credit must be accompanied by a Return
MaterialAuthorization (RMA) Number. Freight on all returned itemsmust be prepaid by the customer who
is responsible for any loss or damage caused by common carrier in transit. Returns for Warranty must
include a Failure Report for each unit, by serial number(s), as well as a copy of the original invoice showing
date of purchase.
To reduce risk of damage, returns of product must be in an ICS Advent shipping container. If the original
container has been lost or damaged, new shipping containers may be obtained from ICS Advent Customer
Service at a nominal cost.
ICS Advent owns all parts removed from repaired products. ICS Advent uses new and reconditioned parts
made by various manufacturers in performing warranty repairs and building replacement products.
If ICS Advent repairs or replaces a product, its warranty term is not extended.
ICSAdvent will normally return your replacement or repaired items via Second DayAir. Overnight delivery
or delivery via other carriers is available at an additional charge.
Limitation of Liability
In no event shall ICS Advent be liable for any defect in hardware, software, loss, or inadequacy of data of
any kind, or for any direct, indirect, incidental, or consequential damages in connection with or arising out of
the performance or use of any product furnished hereunder. ICSAdvent liability shall in no event exceed the
purchase price of the product purchased hereunder. The foregoing limitation of liability shall be equally
applicable to any service provided by ICSAdvent or its authorized agent.
Some Sales Items and Customized Systems are not subject to the guarantee and limited warranty.
However in these instances , any deviations will be disclosed prior to sales and noted in the original invoice.
ICS Advent reserves the right to refuse returns or credits on software or special order items.

Page - vii
Advisories
Three types of advisories are used throughout the manual to stress important points or warn of potential
hazards to the user or the system. They are the Note, the Caution, and theWarning. Following is an example
of each type of advisory:
Note: The note is used to present special instruction, or to provide extra information which may
help to simplify the use of the product.
CAUTION!
A Caution is used to alert you to a situation which if ignored may cause injury or
damage equipment.
WARNING!
AWarningisusedtoalertyouofasituationwhichifignoredwillcauseseriousinjury.
Cautions and Warnings are accented with triangular symbols. The exclamation symbol is used in all cautions
and warnings to help alert you to the important instructions. The lightning flash symbol is used on the left
hand side of a caution or a warning if the advisory relates to the presence of voltage which may be of
sufficient magnitude to cause electrical shock.
Use caution when servicing any electrical component. We have tried to identify the areas which may pose
a Caution or Warning condition in this manual; however, ICS Advent does not claim to have covered all
situations which might require the use of a Caution or Warning.
You must refer to the documentation for any component you install into a computer system to ensure proper
precautions and procedures are followed.

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Page - ix
Table of Contents
Chapter 1: Installation ..................................................................................................1
Backing Up The Disk ............................................................................................................................ 1
HardDiskInstallation............................................................................................................................ 1
InstallingThe Card ................................................................................................................................3
Chapter 2: Functional Description.............................................................................. 5
Watchdog ............................................................................................................................................. 5
AdditonalFeaturesOnPCI-WDT501..................................................................................................... 7
Computer PowerMonitor ................................................................................................... 7
ComputerTemperatureMonitor ......................................................................................... 7
ComputerTemperatureMeasurement................................................................................ 7
Changeof State.................................................................................................................7
FanSpeed......................................................................................................................... 7
Buzzer .............................................................................................................................. 7
Opto-IsolatedOutputs ....................................................................................................... 7
Status Register ..................................................................................................................................... 8
UtilitySoftware ..................................................................................................................................... 8
Chapter 3: Option Selection ...................................................................................... 11
RelayEnable/Disable ..........................................................................................................................11
ScrewTerminals ..................................................................................................................................11
LEDTerminals .....................................................................................................................................12
Chapter 4: Address Selection....................................................................................13
Chapter 5: Programming ...........................................................................................15
MonitorFunctions................................................................................................................................15
Interrupts .............................................................................................................................................16
WatchdogProgrammingOptions .........................................................................................................16
Foreground Watchdog Mode ...........................................................................................17
Background WatchdogMode ..........................................................................................17
CombinationResetMode .................................................................................................18
SampleProgram ..............................................................................................................18
VisualBasicUtility Driver......................................................................................................................20

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Chapter 6: Connector Pin Assignments................................................................... 23
Chapter 7: Specification ............................................................................................25
AppendixA: Programmable Interval Timer..............................................................27
Programming .......................................................................................................................................28
Readingand Loading The Counters......................................................................................................29
List of Figures
Figure 1: Block Diagram............................................................................................................................. 9
Figure 2: WDG50x Option Selection Map..................................................................................................12
List of Tables
Table 1: Buzzer operationrequiresconfiguring Counter #2in mode 1 ........................................................15
Table 2: RearPanel D ConnectorJ1 ..........................................................................................................23
Table 3: On-BoardTerminal Block .............................................................................................................24
Current Revision 1B
December 2000

Manual Number: 00650-144-1 Page 1
Chapter 1: Installation
Backing Up The Disk
The software supplied with the PCI-WDT50x is provided on two 3.5-inch diskettes. As with any
software package, you should make back-up copies for everyday use and place your original master
diskettes in a safe location.
The easiest way to make a back-up copy is to use the DOS DISKCOPY utility.
In a single-drive system, the command is diskcopy a: a: Enter
In a windowed environment (such as OS2, Windows 3.1, Windows95, or WindowsNT) select all of
the files on the diskette and drag them to a backup destination.
Hard Disk Installation
The files contained on the master diskette must be installed onto your hard disk prior to use. To do
this, perform the following:
1. Place the master diskette into the A: drive (substitute B: as appropriate).
2. Change the active drive to A: by typing a:Enter
3. Type install press enter and follow the on-screen prompts.
The installation process will create several directories on your hard disk. If you accept the instal-
lation defaults, the following structure will exist.
From the diskette titled PCI-WDGCSM
PCIWDGCSM: Root or base directory containing the SETUP.EXE setup program used to
help you configure jumpers and options on the card. The directory also
contains PCIFind.EXE, a utility to locate resources used by installed PCI-
bus cards.
PSAMPLES: A subdirectory of PCIWDGCSM that contains Pascal samples.
CSAMPLES: A subdirectory of PCIWDGCSM that contains C samples.
BSAMPLES: A subdirectory of PCIWDGCSM that contains QuickBASIC samples.
From the Tools/Utilities diskette:
Findbase.*: A DOS utility that can be used to select an appropriate base address that will
not conflict with other computer resources in ISA-bus systems.
Poly.exe: This is a generic utility program to convert tabular data into an nthorder
polynomial. This program is useful to calculate linearization coefficients
for non-linear analog inputs. (Note: Thermocouple and RTD linearization
tasks are included in driver tasks for A/D cards that can be used with t/cs
and RTDs.)

Manual Number: 00650-144-1Page 2
PCI-WDT 500/501 Manual
RISCTerm.exe: This is a dumb-terminal type serial communication program designed for
RS422/485 operation. It is used primarily with our Serial cards and
REMOTE ACCES pods.
Risc.bat: Thisbatchfiledemonstratesthecommand line parameters if RISCTerm.exe.
VBACCES: A VisualBASIC utility driver that includes PEEK and POKE statements for
reading and writing RAM as well as INPORT and OUTPORT for reading
and writing I/O. The driver is in the form of a 16-bit DLL and allows you
to access hardware as if the language was designed for it when you use
Windows 3.1 or VisualBASIC 3.0 for Windows. (VisualBASIC 4.0 and 5.0
support are provided separately.)
PCIFind.exe: When PCI-Bus cards are used with DOS, Windows 3.1, and Windows95
systems, you can use this command to learn what base addresses the system
has assigned to your cards. (NOTE: Under WindowsNT use PCINT.SYS
to do this task.)
ACCES95: This DLL is for use with Windows95. It provides a fast simple way to
access memory-mapped I/O devices by means of direct register access and
using the standard 32-bit DLL calling convention. Four sample applications
are included in VisualBASIC 4.0, Delphi 2.0, Borland C/C++ 4.0, and
Borland C++ Builder 1.0. (See Section 5 of this manual for more
information.)
Four functions are provided:
 unsigned int InPortB(unsigned int BaseAddress);
 unsigned int InPort(unsigned int BaseAddress);
 void OutPortB(unsigned int BaseAddress,unsigned int value);
 void OutPort(unsigned int BaseAddress,unsigned int value);
The commands access the ports either two-bytes or one-byte wide. The B variants of the four
commands utilize the lower byte of the value argument only. Further, the
method of accessing the functions is language specific.
ACCESNT: This is a 32-bit device driver for use exclusively with WindowsNT 3.51or
newer. It provides byte, word, and dword sized access to I/O (port) memory.
Included are:
ACCESNT.TXT: A Readme file that provides instructions for installation.
ACCESNT.SYS: This is direct driver access using DeviceIOControl, a WindowsNT API call.
ACCESNT.EXE: This is an install program for ACCESNT.SYS.
Directories under ACCESNT are:
INSTALL.SRC: This directory includes ACCESNT.*, source code files demonstrating how
to dynamically load the driver.
ACCESNT.DLL: This interface is similar to ACCES95 in that it provides byte and word sized
inports and outports. Subdirectories titled BUILDER and DELPHI contain
samples for Borland C++ Builder 1.0 and Borland Delphi 2.0/3 respectively.
This DLL is easier to use than ACCESNT.SYS but operates a little more
slowly.
ACCESNT.SYS: As described above, this interface provides direct driver access.

Manual Number: 00650-144-1 Page 3
PCINT: This program is used when PCI-bus cards are used in WindowsNT operating
systems. It runs only on WindowsNT. There are three files as follows:
PCINT.TXT: Contains instructions on use of these files.
PCINT.EXE: This is an installation program and utility for NTioPCI.SYS. You run this
program to both install and to use NTioPCI.SYS. The program displays
resources allocated by the system for an installed PCI-bus card. Under
WindowsNT, this program is used rather than PCIFind.exe. (The latter is
used when PCI-bus cards are run under DOS, Windows 3.1 or Windows95.)
NtioPCI.SYS: ThisfileisinstalledbyPCINT.EXEandisusedtodeterminetheconfiguration
of an installed PCI-bus card.
Installing The Card
The PCI-WDT50x card can be installed in a five-volt PCI slot of an IBM or compatible computer.
Before installing the card, carefully read the Option Selection section of this manual and config-
ure the card according to your requirements. Finally, our SETUP.EXE program will lead you
through the process of setting the options on the PCI-WDT50x. The setup program does not set the
options. These must be set manually by jumpers on the card.
To install the card:
1. Turn OFF computer power.
2. Remove the computer cover.
3. Install jumpers from either the Option Selection section of this manual or the suggestions of
our SETUP.EXE software program.
4. Install the card in an available PCI-bus slot. You may need to remove a backplate first.
5. Inspect for proper fit of the card and tighten screws. Make sure that the card mounting bracket
is properly screwed into place and that there is a positive chassis ground.
6. Replace the computer cover and turn the computer ON.
7. Enter the CMOS setup program of your system and verify that the PCI plug-and-play option is
set appropriately for your system. Systems running Windows95 (or any other PNP-compliant
operating system) should set the CMOS option to OS. Systems running under DOS, WindowsNT
3.51, Windows 3.1, or any other non-PNP-compliant operating system should set the PNP
CMOS option to BIOS or Motherboard. Save the option and continue booting the system.
If you are using Windows95, your operating system should detect the new hardware and prompt
you for the installation disk. The simplest option is to insert the provided diskette into the A drive
and allow the operating system to look for the files that it wants.
Alternatively, if you have already installed the software to your computer, you can specify the
installation directory instead of allowing Windows95 to look around. Either option will work
acceptably. Please note that even though Windows95 looks for and finds software to install, no
driver is actually installed, used, or needed. This step merely tells Windows95 where to place the
card in the registry of devices. You can find the installed card in Device Manager, under the class
Data Acquisition. Use this method to determine the cards base address as PCIFind.EXE may or
may not work under your specific installation of Windows95.

Manual Number: 00650-144-1Page 4
PCI-WDT 500/501 Manual
If you are not using Windows95, or if your installation of Windows95 does not detect the new
hardware you installed, run PCIFind.EXE to determine the base address that the computer as-
signed.
The base address assigned by BIOS or the operating system can change each time new hardware is
installed into or removed from the computer. Please recheck PCIFind or Device Manager if the
hardware configuration is changed.
Input/Output Connections
Connections are made via a 25-pin connector on the card mounting bracket. Also, there is a six-
terminal terminal block. Signal assignments are listed in Section 6 of this manual.
To ensure that there is minimum susceptibility to EMI and minimum radiation, it is important that
the card mounting bracket be properly screwed into place and that there be a positive chassis
ground. Also, proper EMI cabling techniques (cable connect to chassis ground at the aperture,
shielded twisted-pair wiring, etc) be used for the input/output wiring.
Connecting the Reset Line
After inserting the power-good line into the clamp, compress the metal bar with pliers and close the
protective cover.

Manual Number: 00650-144-1 Page 5
Chapter 2: Functional Description
This multifunction card contains a watchdog timer. Additionally, one or more options may be
included on your card. These are: a computer power supply monitor, a computer internal tempera-
ture monitor, an optional capability to read the temperature, a fan-speed monitor, a fan-speed con-
trol, an on-card buzzer to signal watchdog timeout, and a fan-speed control.
Watchdog
Its a fact of life that computers and programs can fail. If a computer or program fails it can cause
catastrophic damage. Even if a program merely locks up, an unattended computer could be down
for days. There are two methods to reduce risk of computer or software failure: (a) redundancy and
(b) a watchdog circuit. Neither method offers 100% assurance, but both of these methods reduce
risk or consequences of failure. Redundancy, a duplication of computer circuitry, is very expensive.
On the other hand, a watchdog card offers excellent protection from temporary malfunctions at
very low cost.
Your application program must communicate with the watchdog circuit at prescribed intervals. If
this communication (prompt) is missed, the watchdog can be programmed to initiate a computer
reset (reboot). If the reboot is successful, operation may be returned to the previous application
program. If the failure was temporary, proper operation is resumed. If, however, the failure is
persistent, the watchdog will continuously reset the computer. The more frequently the watchdog is
prompted (and shorter watchdog time selected), the less time a faulty computer has to cause dam-
age.
The method used by the PCI-WDT50x card to detect loss of computer function is as follows:
A type 82C54 counter/timer is used. This chip contains three 16-bit counters. A number greater
than zero is set into the chips counters 0 and 1 by your application program. The watchdog is
armed by software command and both counters begin counting down. As long as the computer is
operating properly, both counters will be periodically reloaded to their original programmed values
by your application program before both counters have counted down to zero.
If your software fails to reload the counters, then both counters continue counting until zero is
reached (timeout). When the counters 0 and 1 reach zero, either the power-good line is held low for
approximately 16 milliseconds (performing a hardware reset) through a relay contact, or external
lines (either relay contacts or a de-bounced opto-isolated switch) are active while a buzzer sounds
(if enabled). When a reset condition occurs, the reset circuit is active until a reset pulse returns
from the system bus or power is cycled to the system.
The clock frequency to Counter 0 is derived from the computers clock and is 33_MHZ¸16=
2.08333 MHz. (The period is 0.48 msec.) The output of Counter 0 is used as a clock to Counter 1.
Since each counter can divide by any whole number from 2 to 65,536 (216), the watchdog timeout
period may vary from about 2 microseconds to 2060 seconds.

Manual Number: 00650-144-1Page 6
PCI-WDT 500/501 Manual
The duration of the watchdog reset output (WDRST) and (Not WDRST) can be programmed at
counter 2. There are two clock rates available for the counter and you can select the rate that best
suits your needs. The default clock rate is half the PCI bus clock speed, 16.67 MHz. You can select
a lower rate (2.08333 MHz) by a write to base address+C. That selection will be held until reset by
the computer.
The watchdog card can generate an interrupt request one counter 0 period-width before the reset
timeout. For example, if a reset period of 60 seconds is used with a 5 millisecond delay stored in
counter 0 (the result of a maximum value delay), an interrupt would occur at 59.995 seconds. This
gives the interrupt handler software 5 milliseconds to refresh the watchdog before a reset action
occurs. This should allow your software to take corrective actions if the system software continued
to run but the software that should have reset the watchdog had failed.
The interrupt request (IRQ) output is tri-stated at a high-impedance when it is not sending an
interrupt request (1 msec). Thus, that IRQ number can be shared with other I/O cards that have
shareable ability. The system assigns the IRQ level when the card is installed.
There are several outputs from the watchdog circuit as listed below (See Section 6 for pinout.)
a. Double-pole double-throw, Form C, relay contacts on the rear panel I/O connector
b. An opto-isolated reset output on the rear panel I/O connector
c. An opto-isolated complement of the reset output on the rear panel I/O connector
d. A buffered TTL CTRGATE (counter enabled) output on the rear panel I/O connector
e. TTL Reset signal (active high) on internal terminal block
f. The complement of that Reset signal on internal terminal block
g. A watchdog 130.208KHz heartbeat on the rear panel I/O connector
h. Unfused 5VDC output at the rear panel I/O connector
i. Fan Drive Power return on internal terminal block
j. Fan Drive Power out on internal terminal block
k. System Shutdown (on PCI-WDT501) can initiate computer shutdown if the fan stops
As noted in items band c above, opto-coupler outputs (one ON when the other is OFF) are pro-
vided for use where relay contact bounce could be a problem. Further, as noted in e. above, a
buffered discrete output is also provided. This output goes high to signal a watchdog reset condi-
tion. Finally, a 130.208 KHz, TTL-level, 50% duty cycle signal is provided at I/O connector pin 13
when the watchdog circuit is enabled and no reset is in progress. Otherwise, this output is in a low
state.

Manual Number: 00650-144-1 Page 7
Additional Features On PCI-WDT501
Computer Power Monitor
The three computer power supplies (+5V, +12V, and -12V) are monitored. If one or more of those
voltages are more than ±6% outside of their nominal values, then two bits of a Status Register
indicate whether there is an overvoltage or an undervoltage. In addition, an interrupt request can be
generated.
Computer Temperature Monitor
This feature monitors ambient temperature inside the computer chassis. The temperature monitor
circuit compares the output of an LM334 temperature sensor with a preset DC voltage level. The
output of the comparator circuit can be read at a bit location of the Status Register and, also, can
cause an interrupt request if that temperature exceeds the factory preset limit (50°C).
Computer Temperature Measurement
An onboard 8 bit A/D converter provides means for a software read of the measured temperature.
Resolution is to approximately 0.7OF.
Change of State
Differential digital inputs are accepted through pins 17 and 18 (ISOIN0). Pins 19 and 20 (ISOIN1)
are opto-isolated and reported in the Status Register. The change-of-state also generates an IRQ
interrupt request.
Fan Speed
This function is usable only in computers which use fans that have a tachometer output. If fan
speed falls to unsafe levels (i.e., if the tachometer output falls to less than 50pps), an interrupt
request is generated.
Buzzer
The buzzer is under software control and can be turned on by programming a write to Base
Address + 4 or off by programming a write to Base Address +5 if counter 2 is configured in mode
1. Configuring counter 2 in mode 0 will defeat the buzzer entirely. (See Programming, Section 5,
for more information.)
Opto-Isolated Outputs
This feature provides an opto-isolated reset signal at pins 4 and 5 (Isolated Reset Output) of the
DB25 connector. An opto-isolated inverse of the reset signal is also provided across pins 6 and 7
(Isolated NOT Reset Output) of the same connector.
This option deletes the opto-isolated Reset output capability and replaces it with capability to
provide outputs under computer control. When this option is installed, one or both of these outputs
may be computer controlled. The option is enabled by a write to base address+F. To activate the

Manual Number: 00650-144-1Page 8
PCI-WDT 500/501 Manual
Opto-Isolated Reset output, a write to base address+D is required and to activate the Opto-Isolated
NOT reset, a write to base address+E is required. All of these are reset by a computer reset or a
read from base address+F.
When this option is installed it is used in conjunction with Option 02 to maintain internal tempera-
ture in the computer by controlling fan speed. The duty cycle of fan power is pulse-width modu-
lated to speed up the fan when temperature becomes too high.
Status Register
Bit assignments of the Status Register are as follows:
BD0 Watchdog counter refresh reminder (Active low)
BD1 Temperature good (Active high)
BD2 Isolated Input #0 status (Same as input)
BD3 Isolated Input #1 status (Same as input)
BD4 Fan good (Active low)
BD5 Power Supply overvoltage (Active low)
BD6 Power Supply undervoltage (Active low)
BD7 IRQ generated (Active low)
Utility Software
Utility software is provided on the diskette with the PCI-WDT50x card. This software includes:
a. SETUP.EXE, an illustrated setup program.
b. WATCHDOG.EXE provides two functions. First, it logs the date and time of every occasion
when it is run. The program is designed to be used from AUTOEXEC.BAT such that it will
effectively log the time of every boot-up including re-boots due to watchdog timeouts. Second,
the program can turn off the buzzer.
c. Sample programs for use with QuickBASIC, Turbo-C and Turbo-Pascal. Sample 1 demonstrates
how to program the counter/timer and Sample 2 displays each bit of the Status Register and
shows the measured temperature inside the computer.
d. Programming hints are provided in the Programming section of this manual.
e. Additionally, a utility driver named VBACCESS and a sample program for use with
VisualBASIC for Windows are provided. See the end of the Programming section of this
manual for a detailed description of this utility driver.

Manual Number: 00650-144-1 Page 9
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Manual Number: 00650-144-1Page 10
PCI-WDT 500/501 Manual
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Manual Number: 00650-144-1 Page 11
Chapter 3: Option Selection
Refer to the Block diagram on the previous page and the Option selection map when reading this
section of the manual. Card operation is determined by jumper installation as described in the
following paragraphs.
Relay Enable/Disable
Hold the card with the fingers at the bottom and the mounting bracket on the left. The relay control
jumper is located alongside the relay at the left hand side of the card. If no jumper is placed on the
block, the relay is always de energized. If a jumper is placed between the two left hand posts, the
relay is always energized when +5V power is on. And, if a jumper is placed between the two right
hand posts, the relay is energized during reset (watchdog timeout). If you desire to use the relay
output, then the jumper should be placed between the right hand posts.
Screw Terminals
Screw terminals located on the right hand side of the card provide the means for connections of the
watchdog output to points inside the computer chassis. The top terminal provides the active low
watchdog output. The next terminal provides a ground. The third terminal provides the comple
mentary active high of the first terminal output. The fourth terminal down provides power to the
computer fan and the fifth terminal from the top provides pulse width modulated control for fan
speed. The bottom terminal is inputs from the computers fan. If the fan stops, this input can signal
that the system should be shut down.