ICS Advent WDT1000-P User manual

Model WDT1000-P
Product Manual
MANUAL NUMBER : 00650-009-28C

Page - ii

Page - iii
FOREWARD
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 war-
ranty and repair policies.
Technical assistance is available at: 1-800-480-0044.
Manual Errors, Omissions and Bugs: A "Bug Sheet" is included as the last page of this manual. Please
use the "Bug Sheet" if you experience any problems with the manual that requires correction.
NOTE
The information in this document is provided for reference only. ICS Advent does not assume any liability
arising out of 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 © 1995 by ICS Advent, a California Corporation, 6260 Sequence Drive, San Diego, CA 92121-
4371. ICS Advent 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 publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any
means, electronic, mechanical, photocopying, recording , or otherwise, without the prior written permission
of the publisher.

Page - iv
This page intentionally left blank

Page - v
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 refund on a product 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 as-new and resalable condition. The Return Procedure must be followed to assure prompt
refund.
Restocking Charges
Product returned after 30 days, and before 90 days, of the purchase will be subject to a minimum 20%
restocking charge and any charges for damaged or missing parts.
Products not returned within 90 days of purchase, or products which are not in as-new and re-
saleable condition, are not eligible for credit return and will be returned to the customer.
Limited Warranty
One year limited warranty on all products sold with the exception of the Performance Series I/O products,
which are warranted to the original purchaser, for as long as they own the product, subject to all other
conditions below, including those regarding neglect, misuse and acts of God. Within one year of purchase,
ICS Advent will repair or replace, at our option, any defective product. At any time after one year, we will
repair or replace, at our option, any defective Performance Series I/O product sold. This does not include
products damaged in shipment, or damaged through customer neglect or misuse. ICS Advent will service
the warranty for all standard catalog products for the first year from the date of shipment. After the first
year, for products not manufactured by ICS Advent, the remainder of the manufacturer's warranty, if any,
will be serviced by the manufacturer directly.
The Return Procedure must be followed to assure repair or replacement. ICSAdvent will normally
return your replacement or repaired item via UPS Blue. Overnight delivery or delivery via other
carriers is available at additional charge.
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 owners 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.
Shipments not in compliance with this Guarantee
and Limited Warranty Return Policy will not be ac-
cepted by ICS Advent.

Page - vi
Return Procedure
For any Limited Warranty or Guarantee return, please contact ICS Advent's Customer Service at 1-800-
480-0044 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 Material Authorization (RMA) Number.
Freight on all returned items must 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.
Limitation of Liability
In no event shall ICS Advent be liable for any defect in hardware or software or 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. ICS Advent 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 ICS Advent or its authorized agent.
Some Sales Items and Customized Systems are not subject to the guarantee and limited warranty. How-
ever 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
Table of Contents
FOREWARD ................................................................................................ iii
Guarantee .................................................................................................... v
Limited Warranty ......................................................................................... v
Return Procedure....................................................................................... vi
Limitation of Liability ................................................................................. vi
Chapter 1: Introduction ............................................................................................... 1-1
Watchdog ............................................................................................................................................ 1-2
Counter / Timer ............................................................................................................................. 1-2
Temperature Alarm ....................................................................................................................... 1-2
Serial Interface .................................................................................................................................... 1-3
Specifications ...................................................................................................................................... 1-4
Chapter 2: Installation ................................................................................................. 2-1
Software Installation ............................................................................................................................ 2-1
Installation Program...................................................................................................................... 2-1
Findbase Routine.......................................................................................................................... 2-1
Hardware Installation ........................................................................................................................... 2-2
How to remain CE Compliant .............................................................................................................. 2-2
Chapter 3: Option Selection ....................................................................................... 3-1
Termination .......................................................................................................................................... 3-1
RTS Control ......................................................................................................................................... 3-1
CTS Control ......................................................................................................................................... 3-1
Simplex or Duplex ............................................................................................................................... 3-2
Full or Half Duplex ............................................................................................................................... 3-2
Watchdog ............................................................................................................................................ 3-2
Interrupts ............................................................................................................................................. 3-2
Chapter 4: Address Selection..................................................................................... 4-1
Address Setup ..................................................................................................................................... 4-3
Chapter 5: Programming ............................................................................................ 5-1
Watchdog ............................................................................................................................................ 5-1
Temperature Alarm ....................................................................................................................... 5-4
Serial Output ........................................................................................................................................ 5-4
Using Visual Basic ............................................................................................................................... 5-5
Appendix A: Connector Pin Assignments ............................................................... A-1
CE Declaration of Conformity

Page - viii
List of Figures
Figure 1-1: WDT1000 Block Diagram ....................................................................................................... 1-5
Figure 3-1: WDT1000-P Jumper and Switch Locations ............................................................................ 3-3
Table 4-1: Standard Address Assignments................................................................................................ 4-2
Table 5-1: Address Map ............................................................................................................................. 5-1
Current Revision 28C
September 1997

Chapter 1: Introduction
Manual Number: 00650-009-28 Page 1-1
Chapter 1: Introduction
This multifunction card contains a Watchdog Timer, an RS422/485 Serial Communications port,
and an internal Temperature Alarm. It is a full length board that installs in long expansion slots of
IBM PC/XT/AT and compatible computers.
This manual covers three models, the Model WDT1000-P, WDT1001-P, and the Model WDT-1002.
The configurations are:
WDT1000-P: Watchdog output is available on the terminal strip TB2-1
WDT1001-P: Watchdog output is on TB2 as above plus a relay output and second terminal
strip, TB1 is provided.
WDT-1002: Same as WDT1001-P except it does not contain the TB2 terminal strip.

Manual Number: 00650-009-28Page 1-2
WDT1000-P Manual
Watchdog
A watchdog circuit is a must in applications where computer failure can cause catastrophic damage.
There are two methods to reduce risk of computer 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,
Industrial Computer Sources Watchdog card offers the best available protection at very low cost.
Its a fact of life that computers can fail. If a computer fails, it acts unpredictably and follows a
strange program path. The Watchdog circuit monitors a program which constantly provides prompts.
If a prompt is missed, the Watchdog initiates a computer reset. This restarts the computer from the
beginning on a prescribed program. If the failure was temporary, proper operation is resumed. If,
however, the failure is persistent, the Watchdog will persistently reset the computer. Thus, the
Watchdog circuit depends on prompts from the applications program. The closer that prompts are
located relative to critical codes, the higher degree of protection achieved. Also, the more frequently
the computer is prompted (and shorter Watchdog time selected), the less time a faulty computer has
to cause damage.
A type 8253-5 counter/timer chip is used in the Watchdog circuit. The clock source for counter/
timer 2 is permanently set to 225 HZ and is derived from a crystal oscillator on the card, independent
of the computer clock. The watchdog time-out is software programmable from 5 mSec to 291
seconds.
The counter/timer chip is operated in mode 0 wherein the output is held low by prompts which
periodically reload counts into the count register. If, due to a failure, the computer deviates from a
prescribed program and a prompt is not received in time, the count register will not be updated, the
counter will reach zero, and the output will go high to initiate a Reset. Following the Reset, the
computer will reboot and the program will be on the prescribed path again.
The address for the Watchdog circuit is completely independent of the Serial Communication ad-
dress. It is jumper selectable anywhere within the I/O address range 200 to 3FF hex. At power turn-
on, the counter/timer output should be disabled via SIO OUT1 until all devices are initialized. At the
very end of initialization, SIO OUT1 (Output 1 of the Asynchronous Communication Element)
should be programmed low to enable the Watchdog circuit. See Chapter 5, Programming, for more
detail.
The output of the Watchdog circuit is an open-collector transistor output rated at up to 100 mA.
That output is available at TB2-1. TB2-2 provides a ground return. If an inverted output is desired,
you may cut the clad at jumper G and install a wire jumper at location H. (G and H are located
immediately to the left of IC U16).
Counter / Timer
The 8253A-5 counter/timer chip contains three 16-bit counters. Counter/timer 2 is used by the
Watchdog circuit. Counter/timers 0 and 1 are not available to the user.
Temperature Alarm
The WDT1000-P card also contains a temperature alarm circuit that activates if the internal tem-
perature in the computer becomes excessive. That alarm can initiate an interrupt so that orderly
shutdown can be accomplished.