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Multi-Function Watchdog Card
WD-1 Document Part Document Reference Document Issue Level Manual covers PCBs identified 0127-1013 0127-1013.Doc WD-1 Rev.
rights reserved. part this publication reproduced, stored retrieval system, transmitted, form means, electronic, mechanical, photocopied, recorded otherwise, without prior permission, writing, from publisher. permission contact Blue Chip Technology. Information offered this manual correct time printing. Blue Chip Technology accepts responsibility inaccuracies. This information subject change without notice. trademarks registered names acknowledged.
Blue Chip Technology Ltd. Chowley Oak, Tattenhall Chester, Cheshire 9EX. Telephone 01829 772000 Facsimile 01829 772001.
Amendment History
Issue Level
Issue Date 21.06.89 14/8/97
Author
Amendment Details First draft Window front cover logo. 98/086
Contents
INTRODUCTION. OUTLINE DESCRIPTION SPECIFICATIONS Electrical Specification Physical Specification Electromagnetic Compatibility (EMC). Specification USER ADJUSTMENTS Selecting Base Port Address Port ELECTRICAL OPTIONS Input/Output Connections. Watchdog Channel. Temperature Monitor. Speed Monitor. Power Supply Monitor Opto-Isolated External Inputs Patch Inputs Fault Indications. Enabling/Disabling Watchdog Functions. OPERATING GUIDE. Programming Guide Example Programs. WATCHDOG SOFTWARE APPLICATION NOTES Changeover Relay External Inputs APPENDIX APPENDIX PC/XT/AT Port Address
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Contents
APPENDIX PC/XT Interrupt APPENDIX Interrupt APPENDIX Temperature Calibration Procedure
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Blue Chip Technology Ltd.
Introduction
INTRODUCTION
WD-1 card provides users with ensuring integrity their machine critical applications. card port Hex. Providing have other cards this address immediately software (see Section have other cards must read section 2.1. Some features card, however, such using watchdog reading temperature, require more detailed understanding card relevant sections this document should read carefully. card's features briefly discussed below highlighted Figure supply rails continually monitored IC1. This chip detects undervoltage (+Ve rails) overvoltage (-Ve rails) generates fail signal either these conditions occurs. fail detection circuit provided which requires replacement fan. generates string pulses whose frequency proportional speed fan. These pulses feed into monostable circuit which generates fail signal frequency pulses falls below preset value. temperature detection circuit performs tasks. Firstly LM35 temperature generates voltage proportional temperature. This voltage compared pre-set voltage using generates fail signal temperature exceeded 37°C. Secondly, this voltage amplified converted digital form (IC4). This converts this signal into temperature value which displayed monitor.
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Introduction
watchdog channel includes timer circuit whose timing period selected user. channel should sent pulse regular intervals user software indicate processor activity. timer circuit fails receive pulse within selected time period, then fault condition will generated. this facility will require user insert appropriate watchdog coding into software. board equipped with opto inputs which arranged assess various types input signal. full description this facility found section application notes given section additional type inputs provided monitoring internal level signals. Caution should taken ensure correct signal compatibility. above fail signals feed into logic circuit which allows user select which functions required. This selection/deselection performed writing masking byte port. address this port given section along with assignment details. current status accessed time reading port byte. Details this port again found section event fault condition aforementioned circuit will de-energise relay, activate buzzer generate interrupt. This interrupt link selectable used activate pop-up menu software.
WD-1 PC/XT/AT, 386, Model 62-way compatible bus. addition Software, several BASIC programs provided text disk.
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Outline Description
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OUTLINE DESCRIPTION
This card designed continually monitor essential functions such temperature, processor operating, power supplies speed. addition WD-1 facility monitor remote inputs means opto isolated inputs. Each above functions enabled/disabled suit user requirements. card equipped with buzzer, relay remote sensing software which provides menu event fault condition. This menu displays current status allows user take appropriate action.
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Specifications
SPECIFICATIONS Electrical Specification
Input Connections opto inputs external monitoring (invert/non-invert: link selectable) Input Voltage range 3.5V typical) External opto power supply (EXT/INT:link selectable) Voltage range: Sensed Input Voltage Range: Minimum pulse frequency: Output Connections Single pole changeover relay (polarity sensitive) (Relay link selectable) Voltage range contact current Cut-out Temperature Cut-out Voltages D.C., A.C. 750mA (resistive) 37°C (factory set) +/-4.75V (+/-5V) +/-11.65V (+/-12V) 0.1V (+/-5V) 0.15 (+/-12V) 1.75W
3.5V typical)
3.5V 240ppm
Voltage Cut-out Hysteresis Power Dissipation
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Specifications
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Physical Specification
Height Width Depth 107mm 19mm 132mm
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Specifications
Electromagnetic Compatibility (EMC)
This product meets requirements European Directive (89/336/EEC) eligible bear mark. been assessed operating Blue Chip Technology Icon industrial However, because board installed variety computers, certain conditions have applied ensure that compatibility maintained. meets requirements industrial environment (Class product) subject those conditions. board must installed computer system which provides screening suitable industrial environment. recommendations made computer system manufacturer/supplier must complied with regarding earthing installation boards. board must installed with backplate securely screwed chassis computer ensure good metal-to-metal (i.e. earth) contact. Most problems caused external cabling boards. important that external cabling board totally screened, that screen cable connects earth both ends cable. recommended that round screened cables with braided wire screen used preference those with foil screen drain wire. With terminal block connection card there space available earth point board mounting bracket. recommended that screen connected metal body (and hence earth) shortest possible "pigtail". Icon chassis these available adjacent expansion area. Unscreened cable will adequate unless contained wholly within cabinetry housing industrial carefully routed.
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Ensure that screen external cable bonded good earth remote cable. Failure observe these recommendations invalidate compliance.
Warning This Class product. domestic environment this product cause radio interference which case user required take adequate measures.
Specification
Blue Chip Technology Icon industrial fitted with this card meets following specification: Emissions: 55022:1995 Radiated Conducted Immunity: 50082-2:1995 incorporating Electrostatic Discharge 61000-4-2 Performance Criteria 50140 Performance Criteria 61000-4-4 Performance Criteria Class Class
Radio Frequency Susceptibility
Fast Burst Transients
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User Adjustments
USER ADJUSTMENTS Selecting Base Port Address
board located slot mother board must appear specified position address) port map. Available positions shown IBM-PC Technical Reference Guide. However, those possess copy this document good place location normally allocated prototyping card supplied IBM. This address decimal. Blue Chip Technology cards preset this address factory. However, devices should used while same address since contention will occur neither board will work. your machine contains card with conflicting address then another reasonably safe address (Hex). links provided board base address board within IBM-PC port map. address binary with presence link representing absence link representing base address Decimal (300 Hex) following pattern links indicated below:
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User Adjustments
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Figure Selecting Base Address Note: View board with back panel RHS. Bits port address links.
.More example addresses shown Appendix Note: cards must occupy same address.
Port
Three ports used WD-1 control functions card. These described below:
Address Base Base Base Read Status Byte Value Write Mask Byte Start Conversion Watchdog Reset
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User Adjustments
Mask Byte
ADDRESS XX0H (W/O) POWER MASK WATCHDOG MASK TEMPERATURE MASK EXTERNAL INPUT MASK EXTERNAL INPUT MASK MASK PATCH INPUT MASK PATCH INPUT MASK
N.B. each above Mask Bits: Enable function
Disable function
Star Convert
ADDRESS XX1H (W/O) VALUE
Watchdog Reset
ADDRESS XX2H (W/O) VALUE
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User Adjustments
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Status Byte
ADDRESS XX0H (R/O) POWER STATUS PROCESSOR STATUS TEMPERATURE STATUS EXTERNAL INPUT STATUS EXTERNAL INPUT STATUS
N.B. above functions are: Fail BUSY BUSY BUSY Value
ADDRESS XX1H (R/O)
VALUE
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Electrical Options
ELECTRICAL OPTIONS Input/Output Connections
8-way Klippon screw terminals provided rear panel board external connections. terminals labelled following diagram. Connector
P1/1 P1/2 P1/3 P1/4 P1/5 P1/7 P1/8 P1/9 P1/10 P1/11 P1/12 P1/13 P1/14 P1/15 P1/16 Relay Common Relay Normally Closed Relay Normally Open 1EXT 2EXT
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Electrical Options
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Watchdog Channel
watchdog channel designed monitor integrity periodically receiving reset signal from system. example program generating such signal found section 4.2.5. interval between these reset signals link selectable indicated below. Should WD-1 card fail receive watchdog reset time during reset period, then fault signal will generated. Delay time Delay time 5120
Delay time Delay time
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Electrical Options
watchdog channel additional link, LKL. This link allows watchdog facility installed automatically from start after preset delay allow system access software. This offered applications where processor integrity imperative. Alternatively, watchdog facility installed manually i.e. through WD-1 software. link arrangement shown below. Manual
Automatic
Temperature Monitor
WD-1 temperature sensing circuitry serves purposes. First provides fault indication ambient temperature exceeds precept value 37°C. Second provides accurate temperature measurement. This value displayed WD-1 status window example program found section 4.2.3 showing this value read. temperature sensor located WD-1 card specified location within using 3-way molex connector. details given below:
P3/1 P3/2 P3/3 Output
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Electrical Options
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Speed Monitor
order this facility special with pulsed sensor output required, such hall effect. Possible sources such fans ETRI PAPST. However, doubt, contact Blue Chip Technology Sales Department. fail speed preset 240ppm (pulses minute) i.e. 240rpm 1ppr fan. range input voltages 3.5V 12V. Connections made molex header shown below:
P2/1 P2/2 P2/3 Sensor input from
Power Supply Monitor
WD-1 card senses four supply rails (+5V, +12V, -12V). card generates fail signal rail falls below +4.75V, +11.65 (+5V, +12V) rises above -4.75, -11.65V (-5V, -12V). fail signal cleared when voltage rises falls +4.85 +11.80V -4.85V, -11.80V respectively. N.B. above voltage values preset within tolerance +/-0.03V (+/-5V) +/-0.05V (++/-12V).
Opto-Isolated External Inputs
opto inputs provided WD-1 card additional monitoring remote equipment such power supplies, relays etc. These inputs configured voltage level typically) volt free contact inputs. Examples these arrangements found section opto inputs provide link selectable internal isolated +5V, external +5V, opto supply (links LKN). outputs opto isolators also link selectable inverting no-inverting input (links LKH).
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Electrical Options
Internal
External Internal Isolated +5V,
Internal External
External Isolated +5V,
Inverting Configuration
Non-inverting
normal input voltage opto-isolators However, higher input voltages used user changes values resistors R38. value these resistors must calculated ensure that current passed through opto-isolator will drop 1.5V constantly. Required resistance (Input Voltage-1.5)/0.01 Ohms. following table gives some typical examples using preferred resistor values.
Input Voltage Resistor Value
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Electrical Options
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330R (Fitted standard) 820R
Patch Inputs
further link selectable inputs provided PTCH1 PTCH2 additional internal monitoring. These connections made directly soldering leads into solder holes adjacent links LKD. These inputs MUST compatible (+5V, 0V), with logic (+5V) providing fail condition. linking arrangement shown below links ground MUST included these additional inputs required. Connection Additional Patch Inputs Connection when Patch Inputs required
Fault Indications
event fault condition several actions result. link selectable (LKB) buzzer provided annunciation immediate vicinity link selectable (LKF) relay also provided which de-energises thus changes over contacts event fault. This ideal remote monitoring relay outputs include diodes which allow relay remote cable assemblies scrutinised damage. fault condition
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Electrical Options
also generate interrupt. interrupt from selected using LKE. This interrupt used activate WD-1 menu.
with interrupt selected
N.B. selected Blue Chip Technology factory WD-1 software defaults this setting.
Enabling/Disabling Watchdog Functions
aforementioned WD-1 facilities enabled/disabled writing mask WD-1 card. addition current status read from WD-1 card. Software details both these actions found section
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Operating Guide
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OPERATING GUIDE Programming Guide
following guides applicable Microsoft BASIC GWBASIC. following programming functions essential writing reading from WD-1 card. INPUT Returns byte from port assigns this value variable, OUTPUT Outputs byte port
4.2.1
Example Programs
Entering Base Address
Before read write instructions performed, base address must entered. This value MUST coincide with that card links (LKA). Program: BASEADD.BAS (Provided Demonstration Disk).
WD-1 BASE ADDRESS PROGRAM CLEAR SCREEN INPUT ENTER BASE ADDRESS WD-1 CARD DECIMAL) ,BASE BASE BASE ADDRESS OPERATIONS
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Operating Guide
4.2.2
Reading WD-1 Status
following program will access status byte indicate present logic level. N.B. Logic indicates fault. Program STAT.BAS (Provided Demonstration Disk)
Reading status Program PRINT:PRINT INPUT Enter base address decimal ,BASE PRINT BASE:PRINT PRINT Function Status STATUS BASE Status Register Address INP(STATUS) `Read Status STAT READ PRINT STAT LEV>0 THEN LL=1 ELSE LL=0 PRINT STAT STAT*2 STAT GOTO Data String DATA /POWEROK DATA /WDOGOK DATA /TEMPOK DATA /EXT1OK DATA /EXT2OK DATA /FANOK
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4.2.3
Reading Temperature
following program will access provide temperature reading. Program TEMP.BAS (Provided Demonstration Disk)
READING TEMPERATURE PROGRAM INPUT Enter base address decimal,BASE SCON BASE+1 START CONVERSATION CONTROL ADDRESS ADCSEL=BASE+1 SELECT CONTROL ADDRESS STATUS BASE STATUS REGISTER ADDRESS SCON,0 START CONVERSATION INP(STATUS) &H40 GOTO 100; LOOP UNTIL BUSY (ADCSEL) ELSE READ TEMP CONVERT TEMP DEGREES PRINT temperature TEMP degrees 100: NEXT DELAY GOTO REPEAT
N.B. This program will continually halted pressing Control (CTRL) Break keys same time.
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Operating Guide
4.2.4.
Writing Mask WD-1 Card
This program will write mask WD-1 card enable/disable functions. program designed load decimal value mask byte. assignment each function listed below:
Data Function Power Wdog Temp Ext1 Ext2 Patch1 Patch2 Value
determine value mask byte, corresponding numbers functions enabled. Example: Power Patch2 enabled then value written mask i.e. Program: MASK.BAS (Provided Demonstration Disk)
WRITING MASK WD-1 PRINT:PRINT INPUT Enter base address decimal, BASE INPUT ENTER MASK VALUE DECIMAL),WDMASK MASK BASE MASK,WDMASK STOP
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Operating Guide
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4.2.5
Typical Watchdog Reset Software
This program designed generate watchdog reset pulses used confirm processor integrity. This subroutine should installed user's software with GOSUB commands periodically inserted into coding. amount allowable coding between these GOSUB commands will governed speed user's machine, type coding user's application, which must considered before selecting reset delay links (LKN LKM) WD-1 card.
1000 1010 1020 1030 INPUT Enter base address decimal,BASE Example user coding INP(B) WHILE this that here(value) CALL SUBROUTINE
GOSUB 1000 more user coding
GOSUB
CALL SUBROUTINE
WATCHDOG RESET GENERATING SOFTWARE WDOG BASE WDOG,0 RETURN
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Watchdog Software
WATCHDOG SOFTWARE
Watchdog Terminate Stay Resident (TSR) software typing prompt. operator then presented with menus options follows: Exit without Installing Port Address Mask Options Save Options Switch Bell Interrupt Install Watchdog
operator select option from menu Typing number that option Moving onto desired option using cursor keys then selecting that option hitting Return pressing Space Bar. Setup Options perform following functions: Exit without Installing Returns without installing watchdog software. Port Address This option used change port address watchdog card from default Hex. existing port address displayed operator prompted address. address entered hexadecimal.
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Watchdog Software
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Mask Options This option leads second menu screen, Mask Options Menu. From this menu operator disable enable watchdog inputs. Mask Options Menu appears follows: Back Setup Menu Temperature: Fan: Power Supply: Watchdog: External External
Disabled Disabled Disabled Disabled Disabled Disabled
operator selects option using same method used previous menu. When option selected menu updated show current status. example, input power supply, disabled, then selecting Option would enable Selecting Option again would then switch back Disabled operator should select which watchdog inputs enabled. operator wants enter message which will displayed that input fails, then option selected entered. operator will then prompted `Message message should entered terminated pressing Return. Selecting option automatically enables appropriate input. When operator enabled required inputs, entered messages, Option should selected order return Setup Options Menu.
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Watchdog Software
Save Options This option selected when operator wishes make copy disk options selected. This copy then used configure software automatically without operator intervention. When option selected, operator prompted with Filename filename should then entered, terminated pressing Return. filename legal MS-DOC file specification. Details this file given user instructions. Switch Bell When this option selected, fault occurs pops terminal bell will sound alert user. this option selected, then bell will sound. Interrupt This selects number hardware interrupt that Watchdog card will use. software interrupt numbers with being default. Selecting this option increases Interrupt displayed, after goes back Install Watchdog Option should selected when other required options have been selected. will installed, operator will returned prompt. When Watchdog installed. After watchdog installed, will automatically when more watchdog inputs develops fault. options then available. Firstly, quit; this takes without doing anything. watchdog will respond future faults current fault will cleared. This option should avoided. Masking fault available typing This disables faulty input re-enables watchdog card without faulty input. quit then safely selected.
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Watchdog Software
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watchdog also popped typing: CTRL This typed time, including when another program executing. This same options above, with further option Kill watchdog TSR. Killing involves removing watchdog software from memory disabling watchdog card. killed typing CTRL Using Processor Watchdog installing software, watchdog channel disabled approximately seconds. This allows time user coding installed executed. Using file created Save Options When option selected from Setup Options menu, generates file containing current selection options. This file used later installing watchdog without operator intervention. This achieved issuing following commands: filename Filename should name file which operator saved details. This installs watchdog without prompting displaying anything, other than `Watchdog Installed' message. operator also examined options that have been this file typing: filename
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Application Notes
APPLICATION NOTES Changeover Relay
following sections intended show some typical applications WD-1 card. relay output diodes which allows relay output diodes which allows relay connections cabling scrutinised well providing remote fault indications. This will require additional remote sensing circuitry. Alternatively contacts arranged energise/de-energise remote relay. Both configurations shown N.B. NEVER apply more than relay contacts never exceed more than 750mA resistive current.
External Inputs
following configurations suggested applications opto isolated inputs EXT1 EXT2. first (fig 6.3) shows volt free contact utilising board isolated +5V, second (fig 6.5) Voltage level input using external power supply drive opto inputs. N.B. maximum current that drawn from pins 10mA pin. Whilst every effort been taken ensure that information provided accurate, Blue Chip Technology cannot assume responsibility errors this manual their consequences. Should errors detected, company would greatly appreciate being informed them. policy continuous product development operated, resulting contents this document being subject change without notice.
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Appendix
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APPENDIX
Note: View board with back panel RHS. Address Settings Port 300H
Address Settings Port 200H
Address Settings Port 204H
Address Settings Port 210H
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Appendix
Address Settings Port 220H
Address Settings Port 230H
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Appendix
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APPENDIX PC/XT/AT Port Address
Address 000-01F 020-03F 040-05F 060-06F 070-07F 080-09F 0A0-0BF 0F8-0FF 1F0-1F8 200-207 278-27F 2F8-2FF 300-31F 360-36F 378-37F 380-38F 3A0-3AF 3B0-3BF 3C0-3CF 3D0-3DF 3F0-3F7 3F8-3FF Controller (8237A-5) Interrupt Controller (8259A) Timer (8254) Keyboard Controller (8742) Control Port CMOS RAM, Mask (Write) Page Register (Memory Mapper) Interrupt Controller (8259) Clear (80287) Busy Reset (80287) Numeric Processor Extension (80287) Hard Disk Drive Controller Reserved Reserved Parallel Printer Port Reserved Serial Port Reserved Reserved Parallel Printer Port Reserved SDLC Communications, Bisynchronous Reserved Bisynchronous Reserved Reserved Display Controller Diskette Drive Controller Serial Port
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Appendix
APPENDIX PC/XT Interrupt
Number Usage Parity Timer Keyboard Reserved Asynchronous Communications (Secondary) SDLC Communications Asynchronous Communications (Primary) SDLC Communications Fixed Disk Diskette Parallel Printer
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APPENDIX Interrupt
Level Function
Microprocessor Parity Channel Check CTLR CTLR (Interrupt Controllers) Timer Output Keyboard (Output Buffer Full) Interrupt from CTLR Real-time Clock Interrupt Software Redirected (IRQ Reserved Reserved Reserved Co-processor Fixed Disk Controller Reserved Serial Port Serial Port Parallel Port Diskette Controller Parallel Port
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Appendix
APPENDIX Temperature Calibration Procedure
Detailed below test calibration procedure carried Blue Chip Technology before despatch WD-1 card. Equipment required: Computer System WD-1 Card Method: WD-1 card into computer. Connect across terminals WD-1 card marked (MAX) (GND). program TEMP.BAS either Microsoft Basic GWBASIC environment. Read multiply this reading obtain temperature degrees Compare this result with that displayed monitor adjust potentiometer adjust potentiometer until these measurements same within 0.25 degree. Check reading unaltered unchanged calibration complete. however, reading differs from that originally obtained, repeat until values compare. Type CTRL Break keys stop program.
Temp. Sensor
Comparator ADjust
Fail Monitor Input Opto
Watchdog Timer
External Input
Opto
Piezo
Power Supply Monitor
Relay Function Select/Disable
Remote Output
Address Select Interface Logic
Fig.1 Block Diagram
TYPICAL REMOTE RELAY
Fig.6.1 Using drive remote relays
TYPICAL FAULT DETECTION CIRCUIT
Fig.6.2 Using with fault detection circuitry
NORMALLY OPEN (FAIL=CLOSED)
NORMALLY CLOSED (FAIL=OPEN)
Fig.6.3 Remote relays with normally open normally closed
LINK
FUNCTION INTERNAL INTERNAL NORMALLY OPEN RELAY INPUT NORMALLY CLOSED RELAY INPUT
POSITION
Fig.6.4 Link settings WD-1 card setup
NORMAL=1 (+5V) FAIL=0 (0V)
FAIL=1 (+5V) NORMAL=0 (0V)
Fig.6.5 Remote level inputs with INPUT1 non-inverting INPUT2 inverting
LINK
FUNCTION INTERNAL OPTO SOURCE INTERNAL OPTO SOURCE NON-INVERTING LEVEL INPUT INVERTING LEVEL INPUT
POSITION
Fig.6.6 Link settings WD-1 card setup
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