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WD-1 multi-function watchdog card user manual

WD-1 user manual document part n 0127-1013 document reference 0127-1013.doc document issue level 1.0 manual covers pcbs identified WD-1 rev. c all rights reserved. no part of this publication may be reproduced, stored in any retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopied, recorded or otherwise, without the prior permission, in writing, from the publisher. for permission in the uk contact blue chip technology. information offered in this manual is correct at the time of printing. blue chip technology accepts no responsibility for any inaccuracies. this information is subject to change without notice. all trademarks and registered names acknowledged. blue chip technology ltd. chowley oak, tattenhall chester, cheshire ch3 9ex. telephone : 01829 772000 facsimile : 01829 772001.
amendment history issue level issue date author amendment details 0.2 21.06.89 pmd first draft 1.0 14/8/97 sej window front cover and logo. see ecn 98/086
contents blue chip technology ltd. 01271013.doc introduction ................................ ................................ ................ 1 outline description ................................ ................................ .. 1 1.0 specifications ................................ ................................ ....... 2 1.1 electrical specification ................................ ............................. 2 1.2 physical specification ................................ .............................. 3 electromagnetic compatibility (emc) ................................ ............. 4 emc specification ................................ ................................ ......... 5 2.0 user adjustments ................................ ............................... 6 2.1 selecting the base port address ................................ .............. 6 2.2 port map ................................ ................................ .................. 7 3.0 electrical options ................................ ............................ 10 3.1 input/output connections ................................ ....................... 10 3.2 watchdog channel ................................ ................................ . 11 3.3 temperature monitor ................................ .............................. 12 3.4 fan speed monitor ................................ ................................ . 13 3.5 power supply monitor ................................ ............................ 13 3.6 opto-isolated external inputs ................................ ................. 13 3.7 patch inputs ................................ ................................ ........... 15 3.8 fault indications ................................ ................................ ..... 15 3.9 enabling/disabling watchdog functions ................................ . 16 4.0 operating guide ................................ ................................ .. 17 4.1 programming guide ................................ ............................... 17 4.2 example programs ................................ ................................ . 17 5.0 watchdog tsr software ................................ ................ 22 6.0 application notes ................................ .............................. 26 6.1 changeover relay ................................ ................................ . 26 6.2 external inputs ................................ ................................ ....... 26 appendix a ................................ ................................ ................... 27 appendix b ................................ ................................ ................... 29 pc/xt/at port map ................................ ................................ ..... 29 i/o address map ................................ ................................ .......... 29
contents 01271013.doc blue chip technology ltd. appendix c ................................ ................................ ................... 30 pc/xt interrupt map ................................ ................................ .... 30 appendix d ................................ ................................ ................... 31 at interrupt map ................................ ................................ .......... 31 appendix f ................................ ................................ .................... 32 temperature calibration procedure ................................ ............. 32
introduction blue chip technology ltd. 01271013.doc introduction the WD-1 card provides pc users with a way of ensuring the integrity of their machine in critical applications. the card is set to port 300 hex. providing you do not have any other cards set to this address you can immediately run the tsr software (see section 5). if you have other cards set to 300 hex you must read section 2.1. some features of the card, however, such as using the watchdog or reading the temperature, require a more detailed understanding of the card and the relevant sections in this document should be read carefully. the card?s features are briefly discussed below and are highlighted in figure 1. 1. all 4 supply rails are continually monitored via ic1. this chip detects undervoltage (+ ve rails) and overvoltage (- ve rails) and generates a fail signal if either of these conditions occurs. 2. a fan fail detection circuit is provided which requires the use of a replacement fan. the fan generates a string of pulses whose frequency is proportional to the speed of the fan. these pulses feed into a monostable circuit which generates a fail signal if the frequency of the pulses falls below a preset value. 3. the temperature detection circuit performs two tasks. firstly an lm35 temperature i c generates a voltage proportional to temperature. this voltage is compared to a pre-set voltage using ic2 and generates a fail signal if the temperature has exceeded 37 c. secondly, this voltage is amplified and converted to a digital form via the adc (ic4). this converts this signal into a temperature value which can be displayed to the pc monitor.
introduction 01271013.doc blue chip technology ltd. 4. the watchdog channel includes a timer circuit whose timing period can be selected by the user. the channel should be sent a pulse at regular in tervals via the user software to indicate processor activity. if the timer circuit fails to receive a pulse within the selected time period, then a fault condition will be generated. use of this facility will require the user to insert the appropriate watchdog coding into his software. 5. the board is equipped with two opto inputs which can be arranged to assess various types of input signal. a full description of this facility can be found in section 3.6 and application notes are given in section 6. 6. two additional ttl type inputs are provided for monitoring internal ttl level signals. caution should be taken to ensure correct signal compatibility. 7. all the above fail signals feed into a logic circuit which allows user to select which functions are required. this selection/ deselection is performed by writing a masking byte to a port. the address of this port is given section 2 along with its bit assignment details. the current pc status can be accessed at any time by reading a port byte. details of this port can again be found in section 2. 8. in the event of a fault condition the aforementioned circuit will de-energise the relay, activate the buzzer and generate an interrupt. this interrupt is link selectable and is used to activate the pop-up menu software. 9. the WD-1 has an ibm pc/xt/at, 386, model 30 62-way compatible bus. 10. in addition to the tsr software, several basic programs are provided in the text and on the disk.
outline description page 1 blue chip technology ltd. 01271013.doc page 1 outline description this card is designed to continually monitor essential pc functions such as temperature, processor operating, power supplies and fan speed. in addition the WD-1 has the facility to monitor two remote inputs by means of opto isolated inputs. each of the above functions can be enabled/disabled to suit user requirements. the card is equipped with a buzzer, a relay for remote sensing and software which provides a pop up menu in the event of fault condition. this menu displays the current pc status and allows the user to take appropriate action.
page 2 specifications page 2 blue chip technology ltd. 01271013.doc 1.0 specifications 1.1 electrical specification input connections two opto inputs for external monitoring (invert/non-invert: link selectable) input voltage range : 3.5v - 8v (5v typical) external opto power supply ( ext/ int:link selectable) voltage range: : 3.5v - 8v (5v typical) sensed fan input voltage range: : 3.5v - 12v minimum pulse frequency: : 240ppm output connections single pole changeover relay (polarity sensitive) (relay link selectable) max voltage range : 5 0v d.c., 30v a.c. max contact current : 750ma (resistive) cut-out temperature : 37 c (factory set) cut-out voltages : +/-4.75v (+/-5v) : +/-11.65v (+/-12v) voltage cut-out hysteresis : 0.1v (+/-5v) : 0.15 (+/-12v) max power dissipation : 1.75w
specifications page 3 blue chip technology ltd. 01271013.doc page 3 1.2 physical specification height 107mm width 19mm depth 132mm
page 4 specifications page 4 blue chip technology ltd. 01271013.doc electromagnetic compatibility (emc) this product meets the requirements of the european emc directive (89/336/eec) and is eligible to bear the ce mark. it has been assessed operating in a blue chip technology icon industrial pc. however, because the board can be installed in a variety of computers, certain conditions have to be applied to ensure that the compatibility is maintained. it meets the requirements for an industrial environment (class a product) subject to those conditions. the board must be installed in a computer system which provides screening suitable for the industrial environment. any recommendations made by the computer system manufacturer/supplier must be complied with regarding earthing and the installation of boards. the board must be installed with the backplate securely screwed to the chassis of the computer to ensure good metal-to-metal (i.e. earth) contact. most emc problems are caused by the external cabling to boards. it is important that any external cabling to the board is totally screened, and that the screen of the cable connects to earth at both ends of the cable. it is recommended that round screened cables with braided wire screen are used in preference to those with foil screen and drain wire. with the terminal block connection to the card there is no space available for an earth point on the board mounting bracket. it is recommended that the screen be connected to the metal body of the pc (and hence earth) by the shortest possible ?pig- tail?. the bct icon chassis has these available adjacent to the expansion area. unscreened cable will not be adequate unless it is contained wholly within the cabinetry housing the industrial pc and carefully routed.
specifications page 5 blue chip technology ltd. 01271013.doc page 5 ensure that the screen of the external cable is bonded to a good rf earth at the remote end of the cable. failure to observe these recommendations may invalidate the emc compliance. warning this is a class a product. in a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures. emc specification a blue chip technology icon industrial pc fitted with this card meets the following specification: emissions: en 55022:19 95 radiated class a conducted class a & b immunity: en 50082-2:1995 incorporating electrostatic discharge en 61000-4-2 performance criteria b radio frequency susceptibility env 50140 performance criteria a fast burst transients en 61000-4-4 performance criteria b
page 6 user adjustments page 6 blue chip technology ltd. 01271013.doc 2.0 user adjustment s 2.1 selecting the base port address the board may be located in any 62 pin slot in the pc mother board but must be set up to appear at a specified position (or address ) in the port map. available positions are shown in the ibm-pc technical reference guide. however, for those who do not possess a copy of this document a good place is the location normally allocated to the prototyping card as supplied by ibm. this address is 300 hex or 768 decimal. all blue chip technology cards are preset to this address at the factory. however, no two devices should be used while set to the same address since contention will occur and neither board will work. if your machine contains a card with a conflicting address then another reasonably safe address is 200 to 21f (hex). a set of links is provided on the board to set the base address of the board within the ibm-pc port map. the address is in binary with the presence of a link representing a 0 and the absence of a link representing a 1. to set the base address to 768 decimal (300 hex) set the following pattern on the links as indicated below:
user adjustments page 7 blue chip technology ltd. 01271013.doc page 7 figure 1 - selecting the base address note: view board with back panel on rhs. top 6 bits of port address on links. 40 4 10 8 20 lsb 200 80 100 msb .more example addresses are shown in appendix a. note: no two cards must occupy the same address. 2.2 port map three ports are used on the WD-1 to control all functions of the card. these are described below: address read write base + 0 status byte mask byte base + 1 adc value start conversion base + 2 n/a watchdog reset bit
page 8 user adjustments page 8 blue chip technology ltd. 01271013.doc 1. mask byte d7 d6 d5 d4 d3 d2 d1 d0 address xx0h (w/o) power mask bit watchdog mask bit temperature mask bit external input 1 mask bit external input 2 mask bit fan mask bit patch input 1 mask bit patch input 2 mask bit n.b. for each of the above mask bits: 1 = enable function 0 = disable function 2. star convert d7 d6 d5 d4 d3 d2 d1 d0 address xx1h (w/o) any value 3. watchdog reset d7 d6 d5 d4 d3 d2 d1 d0 address xx2h (w/o) any value
user adjustments page 9 blue chip technology ltd. 01271013.doc page 9 4. status byte d7 d6 d5 d4 d3 d2 d1 d0 address xx0h (r/o) power status bit processor status bit temperature status bit external input 1 status bit external input 2 status bit n.b. all above functions are: 1 = fail 0 = ok adc busy bit 0 = busy 1 = not busy 6. adc value d7 d6 d5 d4 d3 d2 d1 d0 address xx1h (r/o) adc value
page 10 electrical options page 10 blue chip technology ltd. 01271013.doc 3.0 electrical optio ns 3.1 input/output connections two 8-way klippon screw terminals are provided on the pc rear panel of the board for external connections. the terminals are labelled in the following diagram. connector p1 top > p1/1 0 : relay common p1/2 0 : relay normally closed p1/3 0 : relay normally open p1/4 0 : ext i/p 1+ p1/5 0 : ext i/p 1- p16 0 : ext i/p 2+ p1/7 0 : ext i/p 2- p1/8 0 : ext + ve p1/9 0 : ext - ve p1/10 0 : nc p1/11 0 : nc p1/12 0 : nc p1/13 0 : nc p1/14 0 : nc p1/15 0 : nc p1/16 0 : nc
electrical options page 11 blue chip technology ltd. 01271013.doc page 11 3.2 watchdog channel the watchdog channel is designed to monitor integrity by periodically receiving a reset signal from the system. an example program for generating such a signal can be found in section 4.2.5. the interval between these reset signals is link selectable as indicated below. should the WD-1 card fail to receive a watchdog reset at any time during the reset period, then a fault signal will be generated. 1 0 lkj lkk delay time = 640 ms 1 0 lkj lkk delay time = 5120 ms 1 0 lkj lkk delay time = 80 ms 1 0 lkj lkk delay time = 20 ms
page 12 electrical options page 12 blue chip technology ltd. 01271013.doc the watchdog channel has an additional link, lkl. this link allows the watchdog facility to be installed automatically from start up after a preset delay to allow the system to access its software. this is offered for applications where processor integrity is imperative. alternatively, the watchdog facility may be installed manually i.e. through the WD-1 tsr software. the link arrangement is as shown below. 1 0 lkl lkl manual set up automatic set up 3.3 temperature monitor the WD-1 temperature sensing circuitry serves two purposes. first it provides a fault indication of the ambient temperature exceeds a precept value 37 c. second it provides an accurate temperature measurement. this value is displayed in the WD-1 tsr status window and an example program can be found in section 4.2.3 showing how this value can be read. the temperature sensor can be located off the WD-1 card and at a specified location within the pc using the 3-way molex connector. pin details of p3 are given below: > p3/1 0 : 0v p3/2 0 : output p3/3 0 : +5v
electrical options page 13 blue chip technology ltd. 01271013.doc page 13 3.4 fan speed monitor in order to use this facility a special fan with a pulsed sensor output is required, such as a hall effect. possible sources of such fans are etri and papst. however, if in doubt, contact blue chip technology sales department. the fail speed is preset to 240ppm (pulses per minute) i.e. 240rpm for a 1ppr fan. the range of input voltages is 3.5v to 12v. connections to the fan are made via the molex header p2 as shown below: > p2/1 0 : 0v p2/2 0 : sensor input from fan p2/3 0 : 0v 3.5 power supply monitor the WD-1 card senses all four supply rails (+5v, - 5v, +12v, -12v). the card generates a fail signal is any rail falls below +4.75v, +11.65 (+5v, +12v) or rises above -4.75, -11.65v (-5v, -12v). the fail signal is cleared when the voltage rises or falls to +4.85 +11.80v and -4.85v, -11.80v respectively. n.b. all the above voltage values are preset to within a tolerance of +/-0.03v (+/-5v) and +/-0.05v (++/-12v). 3.6 opto-isolated external inputs two opto inputs are provided on the WD-1 card for additional monitoring of remote equipment such as power supplies, relays etc. these inputs can be configured for voltage level (5v typically) or volt free contact inputs. examples of these arrangements can be found in section 6. the opto inputs provide a link selectable internal isolated +5v, 0v or external +5v, 0v opto supply (links lkm & lkn). the outputs of the opto isolators are also link selectable for inverting and no-inverting input set ups (links lkg & lkh).
page 14 electrical options page 14 blue chip technology ltd. 01271013.doc internal external lkm lkn + ve - ve internal isolated +5v, 0v internal external lkm lkn + ve - ve external isolated +5v, 0v lkh lkg inverting configuration lkh lkg non-inverting the normal input voltage for the opto-isolators is 5v. however, higher input voltages can be used if the user changes the values of resistors r37 and r38. the value of these resistors must be calculated to ensure that the current passed through the opto-isolator will drop 1.5v constantly. required resistance = (input voltage-1.5)/0.01 ohms. the following table gives some typical examples using preferred resistor values. input voltage resistor value
electrical options page 15 blue chip technology ltd. 01271013.doc page 15 5v 330r (fitted as standard) 10v 820r 12v 1k 24v 2k2 3.7 patch inputs two further link selectable ttl inputs are provided ptch1 & ptch2 for additional internal pc monitoring. these connections are made by directly soldering leads into the two solder holes adjacent to links lkc & lkd. these inputs must be ttl compatible (+5v, 0v), with logic 1 (+5v) providing a fail condition. the linking arrangement shown below and the links to ground must be included if these additional inputs are not required. gnd lkc lkd connection for additional patch inputs gnd lkc lkd connection when patch inputs not required 3.8 fault indications in the event of a fault condition several actions may result. a link selectable (lkb) buzzer is provided for annunciation in the immediate vicinity of the pc. a link selectable (lkf) relay is also provided which de-energises and thus changes over contacts in the event of a fault. this is ideal for remote monitoring of the pc. the relay outputs include diodes which allow the relay and its remote cable assemblies to be scrutinised for damage. a fault condition
page 16 electrical options page 16 blue chip technology ltd. 01271013.doc can also generate an interrupt. any one interrupt from 2 to 7 may be selected using lke. this interrupt is used to activate the WD-1 tsr pop up menu. lke lke with interrupt 3 selected in2 in3 in4 in5 in6 in7 n.b. in3 is selected at the blue chip technology factory and the WD-1 tsr software defaults to this setting. 3.9 enabling/disabling watchdog functions all the aforementioned WD-1 facilities can be enabled/disabled by writing a mask to the WD-1 card. in addition the current pc status can be read from the WD-1 card. software details of both these actions can be found in section 4.
operating guide page 17 blue chip technology ltd. 01271013.doc page 17 4.0 operating guide 4.1 programming guide the following guides are applicable for microsoft basic a or gwbasic. the following programming functions are essential for writing to and reading from the WD-1 card. a) input x = inp (p) returns the byte from port p and assigns this value to the variable, x. b) output out p,d outputs the byte d to port p. 4.2 example programs 4.2.1 entering the base address before any read or write instructions can be performed, the base address must be entered. this value must coincide with that set on the card by links (lka). program: baseadd.bas (provided on demonstration disk). 10 rem WD-1 base address program 20 cls clear screen 30 input 2 2 enter base address of WD-1 card (in decimal) 2 2 ,base 40 rem base is the base address for all i/o operations
page 18 operating guide page 18 blue chip technology ltd. 01271013.doc 4.2.2 reading the WD-1 status * the following program will access the status byte and indicate its present logic level. n.b. logic 1 indicates fault. program stat.bas (provided on demonstration disk) 200 rem reading the status program 210 print:print 215 input 2 2 enter the base address in decimal 2 2 ,base 216 print base:print 220 print 2 2 function status 2 2 230 status = base status register address 240 a = inp(status) ?read the status 250 stat = 1 260 read a$ : print a$ 270 lev = a and stat 280 if lev>0 then ll=1 else ll=0 290 print 2 2 2 2 ll 300 stat = stat*2 310 if stat <33 goto 260 320 end 330 rem data string 340 data 2 2 /powerok 2 2 350 data 2 2 /wdogok 2 2 360 data 2 2 /tempok 2 2 390 data 2 2 /ext1ok 2 2 400 data 2 2 /ext2ok 2 2 410 data 2 2 /fanok 2 2
operating guide page 19 blue chip technology ltd. 01271013.doc page 19 4.2.3 reading the temperature the following program will access the adc and provide a temperature reading. program temp.bas (provided on demonstration disk) 50 rem reading the temperature program 55 input 2 2 enter the base address in decimal 2 2 ,base 60 scon = base+1 start conversation control bit address 70 adcsel=base+1 adc select control bit address 80 status = base status register address 90 out scon,0 start the conversation 100 if inp(status) and &h40 < 1 goto 100; loop until adc not busy 130 c = inp (adcsel) else read the adc 140 temp = c/4 convert to temp in degrees c? 150 print 2 2 the temperature is 2 2 temp 2 2 degrees c 2 2 160 for i = 1 to 100: next delay 170 goto 90 repeat n.b. this program will run continually and can be halted by pressing the control (ctrl) and break keys at the same time.
page 20 operating guide page 20 blue chip technology ltd. 01271013.doc 4.2.4. writing a mask to the WD-1 card this program will write a mask to the WD-1 card to enable/disable the functions. the program is designed to load in the decimal value of the mask byte. the bit assignment of each function is listed below: data bit function value d0 power 1 d1 wdog 2 d2 temp 4 d3 ext1 8 d4 ext2 16 d5 fan 32 d6 patch1 64 d7 patch2 128 to determine the value of the mask byte, add the corresponding numbers of the functions to be enabled. example: if the power and patch2 are to be enabled then the value written to the mask is 129 i.e. 128 + 1. program: mask.bas (provided on demonstration disk) 500 rem writing a mask to WD-1 510 print:print 515 input 2 2 enter the base address in decimal 2 2 , base 520 input 2 2 enter the mask value (in decimal) 2 2 ,wdmask 530 mask = base 540 out mask,wdmask 550 stop
operating guide page 21 blue chip technology ltd. 01271013.doc page 21 4.2.5 typical watchdog reset software this program is designed to generate the watchdog reset pulses used to confirm processor integrity. this subroutine should be installed in the user?s own software with gosub commands periodically inserted into the coding. the amount of allowable coding between these gosub commands will be governed by the speed of the user?s machine, the type of coding and the user?s application, all of which must be considered before selecting the reset delay links (lkn & lkm) on the WD-1 card. 10 input 2 2 enter the base address in decimal 2 2 ,base 15 rem example of user coding 20 x = inp(b) 30 while this do that 40 out here(value) . . 60 gosub 1000 call subroutine 70 rem more user coding 80 ..... . . 90 gosub 100 call subroutine 100 ..... . . 1000 rem watchdog reset generating software 1010 wdog = base + 2 1020 out wdog,0 1030 return
page 22 watchdog software page 22 blue chip technology ltd. 01271013.doc 5.0 watchdog tsr sof tware the watchdog terminate and stay resident (tsr) software is run by typing wd at the dos prompt. the operator is then presented with two menus of options as follows: 0 exit without installing 1 set port address 2 set mask options 3 save options 4 switch bell on 5 interrupt no: 3 6 install watchdog tsr the operator can select an option from the menu by: typing the number of that option or moving the bar onto the desired option using the cursor keys and then selecting that option by hitting return or pressing the space bar. the setup options perform the following functions: 0 exit without installing returns to dos without installing the watchdog tsr software. 1 set port address this option is used to change the port address of the watchdog card from its default of 300 hex. the existing port address is displayed and the operator is prompted for the new address. the new address is entered in hexadecimal.
watchdog software page 23 blue chip technology ltd. 01271013.doc page 23 2 set mask options this option leads to the use of the second menu on the screen, the mask options menu. from this menu the operator can disable and enable any of the six watchdog inputs. the mask options menu appears as follows: 0 back to setup menu 1 temperature: disabled 2 fan: disabled 3 power supply: disabled 4 watchdog: disabled 5 external 1: disabled 6 external 2: disabled the operator selects the option using the same method used for the previous menu. when an option is selected the menu is updated to show its current status. for example, if input 3, power supply, was disabled, then selecting option 3 would enable it. selecting option 3 again would then switch back to disabled and so on. the operator should select which of the watchdog inputs is to be enabled. if the operator wants to enter a message which will be displayed if that input fails, then the option is selected and ?m? entered. the operator will then be prompted by ?message ??. the message should be entered and terminated by pressing return. selecting the ?m? option automatically enables the appropriate input. when the operator has enabled all of the required inputs, and entered any messages, option 0 should be selected in order to return to the setup options menu.
page 24 watchdog software page 24 blue chip technology ltd. 01271013.doc 3 save options this option is selected when the operator wishes to make a copy on disk of all the options selected. this copy can then be used to configure the software automatically without operator intervention. when the option is selected, the operator is prompted with filename ? . the filename should then be entered, terminated by pressing return. the filename can be any legal ms-doc file specification. details of how to use this file are given at the end of the user instructions. 4 switch bell on when this option is selected, if a fault occurs and the tsr pops up, the terminal bell will sound to alert the user. if this option is not selected, then no bell will sound. 5 interrupt no: 3 this selects the number of hardware interrupt that the watchdog card will use. the software can use interrupt numbers 2 to 7, with 3 being the default. selecting this option increases the interrupt no. displayed, up to 7, and after 7 goes back to 2. 6 install watchdog tsr option 6 should be selected when all other required options have been selected. the tsr will now be installed, and the operator will be returned to the dos prompt. when the watchdog tsr is installed. after the watchdog tsr is installed, it will automatically pop up when one or more of the watchdog inputs develops a fault. two options are then available. firstly, q for quit; this takes you out of the tsr without doing anything. the watchdog will not respond to future faults and the current fault will not be cleared. this option should be avoided. masking out the fault is available by typing m . this disables the faulty input and re-enables the watchdog card without the faulty input. q to quit can then be safely selected.
watchdog software page 25 blue chip technology ltd. 01271013.doc page 25 the watchdog tsr can also be popped up by typing: ctrl alt w this can be typed at any time, including when another program is executing. this has the same options as above, but with a further option to kill the watchdog tsr. killing involves removing the watchdog tsr software from memory and disabling the watchdog card. the tsr is killed by typing ctrl k. using the processor watchdog on installing the tsr software, the watchdog channel is disabled for approximately 20 seconds. this allows the time for the user coding to be installed and executed. using the file created by save options when option 3 is selected from the setup options menu, it generates a file containing the current selection of options. this file can be used later for installing the watchdog without operator intervention. this is achieved by issuing the following commands: wd filename filename should be the name of the file to which the operator saved the details. this installs the watchdog tsr without prompting or displaying anything, other than a ?watchdog installed? message. the operator can also examined the options that have been set up in this file by typing: wd filename /e
page 26 application notes page 26 blue chip technology ltd. 01271013.doc 6.0 ap plication notes 6.1 changeover relay the following sections are intended to show some typical applications of the WD-1 card. the relay output has two diodes which allows the relay output has two diodes which allows the relay and its connections and cabling to be scrutinised as well as providing remote pc fault indications. this set up will require additional remote sensing circuitry. alternatively the contacts may be arranged to energise/de-energise a remote relay. both configurations are shown in fig 6.1 - 6.2 n.b. never apply more than 50v dc or 30 ac to the relay contacts and never exceed more than 750ma resistive current. 6.2 external inputs the following configurations are suggested applications for the opto isolated inputs ext1 and ext2. the first set up (fig 6.3) shows a volt free contact utilising the on board isolated +5v, 0v. the second (fig 6.5) has voltage level input using an external power supply to drive the opto inputs. n.b. the maximum current that can be drawn from pins 4/6 is 10ma per pin. whilst every effort has been taken to ensure that the information provided is accurate, blue chip technology cannot assume responsibility for any errors in this manual or their consequences. should any errors be detected, the company would greatly appreciate being informed of them. a policy of continuous product development is operated, resulting in the contents of this document being subject to change without notice.
appendix a page 27 blue chip technology ltd. 01271013.doc page 27 appendix a note: view board with back panel on rhs. address settings for port 300h 40 4 10 8 20 lsb 200 80 100 msb address settings for port 200h 40 4 10 8 20 lsb 200 80 100 msb address settings for port 204h 40 4 10 8 20 lsb 200 80 100 msb address settings for port 210h 40 4 10 8 20 lsb 200 80 100 msb
page 28 appendix a page 28 blue chip technology ltd. 01271013.doc address settings for port 220h 40 4 10 8 20 lsb 200 80 100 msb address settings for port 230h 40 4 10 8 20 lsb 200 80 100 msb
appendix b page 29 blue chip technology ltd. 01271013.doc pag e 29 appendix b pc/xt/at port map i/o address map address 000-01f dma controller 1 (8237a-5) 020-03f interrupt controller 1 (8259a) 040-05f timer (8254) 060-06f keyboard controller (8742) control port b 070-07f rtc and cmos ram, nmi mask (write) 080-09f dma page register (memory mapper) 0a0-0bf interrupt controller 2 (8259) 0f0 clear npx (80287) busy 0f1 reset npx (80287) 0f8-0ff numeric processor extension (80287) 1f0-1f8 hard disk drive controller 200-207 reserved 278-27f reserved for parallel printer port 2 2f8-2ff reserved for serial port 2 300-31f reserved 360-36f reserved 378-37f parallel printer port 1 380-38f reserved for sdlc communications, bisynchronous 2 3a0-3af reserved for bisynchronous 1 3b0-3bf reserved 3c0-3cf reserved 3d0-3df display controller 3f0-3f7 diskette drive controller 3f8-3ff serial port 1
page 30 appendix c page 30 blue chip technology ltd. 01271013.doc appendix c pc/xt interrupt map number usage nmi parity 0 timer 1 keyboard 2 reserved 3 asynchronous communications (secondary) sdlc communications 4 asynchronous communications (primary) sdlc communications 5 fixed disk 6 diskette 7 parallel printer
appendix d page 31 appendix d at interrupt map level function microprocessor nmi parity or i/o channel check ctlr 1 ctlr 2 (interrupt controllers) irq 0 time r output 0 irq 1 keyboard (output buffer full) irq 2 interrupt from ctlr 2 irq 8 real-time clock interrupt irq 9 software redirected to int 0ah (irq 2) irq 10 reserved irq 11 reserved irq 12 reserved irq 13 co-processor irq 14 fixed disk controller irq 15 reserved irq 3 serial port 2 irq 4 serial port 1 irq 5 parallel port 2 irq 6 diskette controller irq 7 parallel port 1
page 32 appendix f appendix f temperature calibration procedure detailed below is the test and calibration procedure carried out by blue chip technology before despatch of the WD-1 card. equipment required: pc computer system dvm WD-1 card method: 1. fit the WD-1 card into the computer. 2. connect the dvm across the terminals on the WD-1 card marked tp1 (max) and tp3 (gnd). 3. run the program temp.bas in either the microsoft basic a or gwbasic environment. 4. read the dvm and multiply this reading by 100 to obtain the temperature in degrees c. compare this result with that displayed on the pc monitor and adjust the potentiometer and adjust the potentiometer rv3 until these two measurements are the same to within 0.25 of a degree. 5. check the dvm reading is unaltered and if unchanged the calibration is complete. if however, the dvm reading differs from that originally obtained, repeat 4. until the two values compare. 6. type ctrl and break keys to stop the program.
bus interface logic comparator adc and adjust sp watchdog timer power supply monitor address select function select/disable relay fan fail monitor temp. sensor piezo led opto in opto in irq 2-7 fan input external input remote output fig.1 block diagram
+ve gnd typical remote relay p1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 fig.6.1 using rl1 to drive remote relays
p1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 typical fault detection circuit fig.6.2 using rl1 with fault detection circuitry
p1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 normally closed (fail=open) rl2 normally open (fail=closed) rl1 fig.6.3 remote relays with rl1 normally open and rl2 normally closed
link function position lkn internal +5v int lkm internal 0v int lkh normally open relay input int lkg normally closed relay input non inv fig.6.4 link settings on WD-1 card for fig 6.3 setup
p1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 gnd normal=1 (+5v) fail=0 (0v) gnd gnd normal=0 (0v) fail=1 (+5v) gnd +ve gnd fig.6.5 remote level inputs with input1 non-inverting and input2 inverting
link function position lkn internal +5v opto source ext lkm internal 0v opto source ext lkh non-inverting level input non inv lkg inverting level input inv fig.6.6 link settings on WD-1 card for fig 6.5 setup

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