Input/Output connections are via five 50
Contents
1. CONST BASEADDR 300 declare base address for IOD card CONST ON iL declare some useful constants CONST OFF 0 vu TYPE sensor_array array 0 15 of integer creates a type of variable used for sensor data VAR sensors_at_arm sensor_array bit by bit status of sensors when alarm is activated Used to notify user of open windows etc VAR sensors_now sensor_now bit by bit status of sensors at current time When compared against sensors_at_arm indicates break in if there is a change VAR arming_stations integer variables representing all four arming stations VAR old_arming_stations integer If value changes toggle alarm on off VAR hour min sec hun word variables used to retrieve time VAR key char useful temporary variable VAR i integer useful temporary variable used in loops VAR j integer useful temporary variable used in loops procedure initialize_board this procedure sets MODE 0 as active and sets ports A B and C LO as input and port C HI as output begin port BASEADDR 3 93 port X is Pascal s method of accessing the port memory This code sets the port memory at address 303 hex and the control register to 93 hex because the bit pattern to set the desired mode and port designations is 10010011 which equals 93 hex end procedure initialize_ board procedure read_sensors VAR ary sensor_ary VAR tempA byte this procedure fetches data from2. ISR that can detect the bit flag on every card and therefore detect the fact that two or more cards report generating an interrupt even though only one interrupt was processed by the CPU 21 Western Reserve Controls 1781 PXB1201 User s Manual CONNECTOR PIN ASSIGNMENTS Five 50 pin headers are provided on the 1781 PXB1201 card one for each group of 24 I O lines The mating connector is an AMP type 1 746285 0 or equivalent Connector pin assignments are listed below Notice that every second line is grounded to minimize crosstalk between signals e en a Pe Port C Hi PC7 Port C Hi PC6 Port C Hi PC5 Port C Hi PC4 Port C Lo PC3 Port C Lo PC2 Port C Lo PCI Port C Lo PCO Port B Port B Port B Port B Port B Port B Port B Port B Port A Port A Port A Port A Port A Port A Port A Port A 5 VDC NOTES This line is an I O port and also an Interrupt Enable This line is an I O port and also a User Interrupt 22 Western Reserve Controls 1781 PXB1201 User s Manual SPECIFICATIONS Features 120 Channels of Digital Input Output All 120 I O Lines Buffered on the Board Four and Eight Bit Groups Independently Selectable for I O Hysteresis Correction and 1KQ Pull Down Resistors on I O Lines Interrupt and Interrupt Disable Capability Tristate able outputs 5V Supply Available to User Compatible with Industry Standard I O Racks from WRC and Opto 22 Potter amp Brumfield etc Digital
3. Inputs Logic High 2 0 to 5 0 VDC Logic Low 0 5 to 0 8 VDC Input Load Hi 20 uA Input Load Lo 200 uA Digital Outputs Logic High 2 5 VDC min source 15 mA Logic Low 0 5 VDC max sink 24 mA 64 mA optional Power Output 5 VDC from computer bus ext 1A fast blow fuse recommended Power Requirements 5 VDC at 200 mA typical Size 13 1 long Environmental Operating Temperature Range 0 degr to 60 degr C Storage Temperature Range 50 degr to 120 degr C Humidity 0 to 90 RH non condensing 23
4. gt sensors_at_arm i 1 then ji l end for arming_stations get_status if arming_stations lt gt old_arming_stations then q 05 flag used to signal that alarm lis de activated until j lt gt 0 if j 1 then begin if j was set to 1 in the above loop then alarm is de activated gettime hour min sec hun writeln Alarm deactivated at hour min sec sound 900 the following code chirps the speaker to indicate disarming delay 100 no sound 17 Western Reserve Controls 1781 PXB1201 User s Manual delay 50 sound 900 delay 100 nosound end end of disarming routine else if alarm begin writeln Sensor j has been activated gettime hour min sec hun writeln The time of alarm is hour min sec ALARM end else end WHILE this end sends the program back to wait to be re armed end TURBO C PROGRAM define BASEADDR 0x300 declare base address for IOD card define ON 1 create useful constant define OFF 0 m n include stdio h include conio h include time h include dos h int sensors_at_arm 15 int sensors_now 15 bit by bit status of sensors at current time When compared against status of sensors at arm indicates break in if there is a change nt arming_stations variables representing all four arming stations If the value changes toggle nt_old_arming_stations ala
5. in configuring jumpers and switches on the card lt is menu driven and provides pictures of the card on the computer monitor You make simple keystrokes to select the functions In turn the pictures then change to show how the jumpers or switches should be placed to effect your choices The setup program is a stand alone program that can be run at any time lt does not require the 1781 PXB1201 to be plugged into the computer for any part of the setup The program is self explanatory with operation instructions and on line help To run this program at the DOS prompt enter PXB120ST followed by the ENTER key VISUALBASIC UTILITY DRIVER WRC provides extensions to the VisualBASIC language on the diskette provided with your card The extensions are in a directory named VB_WRC These extensions are in the form of a DLL a GBL and a VisualBASIC sample Together these files allow you to access the port and main memory space in a fashion similar to BASIC QuickBASIC Pascal C C Assembly and most other standard languages To use these files in a VisualBASIC program you must create a MAK file File New Project similar to the sample provided or else modify your existing project file and include the GBL file File Add File Once this has been done VisualBASIC will be enhanced with the addition of the following functions InPortb Function Reads a byte from a hardware port Due to limitations of VisualBASIC the number is returned i
6. include a 1A fast blow fuse in your circuits in order to avoid possible damage to the host computer The board occupies thirty two consecutive bytes within the I O address space The base address is selectable via ADDRESS SETUP DIP switches A5 A9 anywhere within the hex 000 3FF range However if 96 or less I O lines are to be used then the 1781 PXB1201 board can be configured to Western Reserve Controls 1781 PXB1201 User s Manual occupy only 16 consecutive bytes of l O space Refer to the OPTION SELECTION Section of this manual for a detailed description Utility software provided on the diskette with the 1781 PXB1201 card is an illustrated setup program Interactive displays show locations and proper settings of DIP switches and jumpers to set up board address interrupt levels and interrupt enable Additionally two sample programs and a utility driver for use with VisualBASIC for Windows are provided See the Software section of this manual for a detailed description of the latter 1781 PXB1201 BLOCK DIAGRAM ADDRESS DECODE AND BUS INTERFACE TYPICAL OF FIVE 5 PORTA PORTE T PORT C HI GROUP ORTS PORT CLO DATA BUFFERS COMPUTER ISA BUS ozmancw DPOHOMZZOO IRQ INTERRUPT loo LEVEL SELECT ENABLE EXTERNAL INTERRUPT Western Reserve Controls 1781 PXB1201 User s Manual OPTION SELECTION Refer to the illustrated setup programs on the diskette provided with the card wh
7. ports VAR tempB byte A and B and returns a binary representation of each sensor begin tempA port BASEADDR this procedure loads tempA and tempB with corresponding inputs from the card tempB port BASEADDR 1 for i 0 to 7 do begin if tempA shr i AND ON gt 0 then this tests to see if bit i ary i ON is ON and sets the corresponding array element to ON if it is else else the array element is set to OFF ary i 0FF end for i 0 to 7 do begin if tempB shr i AND ON gt 0 then ary i 8 0N in order to get port B into array elements 8 thru 15 we else add 8 to the bit numbers in the ary it 8 OFF assignment end 15 1781 PXB1201 User s Manual Western Reserve Controls end function get_status integer var temp integer begin end temp port BAS get_st EADDR 2 mp AND atus te procedure ALARM var temp longint begin end begin sound 2000 temp 0 port BASEADDR 2 SF repeat arming_stations if arming_stations lt gt temp 2000000000 1 SOF get_status procedure read_sensors this sets status to the lower nibble of the half defined by Initialize to be input for four arming switches function get_arming_status his starts the computer s peaker which acts as siren for he alarm Are tua cd this sets port C s lower nibble bits to ON this activates four alarm outp
8. 1 Digital Input Output Card A total of 20 address locations are used by the 1781 PXB1201 for addressing the PPl s four for each PPI The PPl s are addressed using address bits A3 through AO See Address Selection section 4 of this manual as follows PORT ADDRESS SELECTION TABLE Port Assignment Base Address Base Address 1 Base Address 2 Base Address 3 Base Address 4 Base Address 5 Base Address 6 Base Address 7 Base Address 8 Base Address 9 Base Address A Base Address B Base Address C Base Address D Base Address E Base Address F Base Address 10 Base Address 11 Base Address 12 Base Address 13 PA Port 0 PB Port 0 PC Port 0 Control Port 0 PA Port 1 PB Port 1 PC Port 1 Control Port 1 PA POrt 2 PB Port 2 PC Port 2 Control Port 2 PA Port 3 PB Port 3 PC Port 3 Control Port 3 PA Port 4 PB Port 4 PC Port 4 Control Port 4 Read Write Read Write Read Write Write Only Read Write Read Write Read Write Write Only Read Write Read Write Read Write Write Only Read Write Read Write Read Write Write Only Read Write Read Write Read Write Write Only The 1781 PXB1201 uses five 8255 5 PPI s to provide a total of 120 bits input output capability The card is designed to use each of these PPI s in mode 0 wherein a There are two 8 bit ports A and B and two 4 bit ports C Hi and C Lo b Any port can be configured as an input or an output c Outputs are latched d Inputs are not latche
9. 1781 PXB1201 120 POINT DIGITAL INPUT OUTPUT CARD User s Manual fune Western Reserve Controls Inc Western Reserve Controls 1781 PXB1201 User s Manual Although every effort has been made to insure the accuracy of this document all information is subject to change without notice WRC takes no liability for any errors in this document or for direct indirect incidental or consequential damage resulting from the use of this manual The information in this document is provided for reference only WRC 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 WRC nor the rights of others WRC is a trademark of Western Reserve Controls Inc IBM PC PC XT and PC AT are registered trademarks of the International Business Machines Corporation Printed in the USA Copyright 1998 1999 WRC Western Reserve Controls Inc 526 South Main Street Suite 310 Akron OH 44311 330 762 1611 Phone 330 762 1622 FAX sales wrcakron com Email http www wrcakron com Web Western Reserve Controls 1781 PXB1201 User s Manual TABLE OF CONTENTS INSTALLATION iaa 2 BAGKING UP DHE DISK ca titi a Abile AN a 2 HARD DISKINSTALEATION aii td tb 2 INSTALLING THE CARD 2 FUNGTIONAL DESCRIPTION iri i i ra 4 BLOGKIDIA
10. BF 3C0 3CE 3D0 3DF 3F0 3F7 3F8 3FF DMA Controller 1 INT Controller 1 Master Timer 8042 Keyboard Real Time Clock NMI Mask DMA Page Register INT Controller 2 DMA Controller 2 Clear Math Coprocessor Busy Reset Coprocessor Arithmetic Processor Fixed Disk Game I O Parallel Printer Port 2 Asynchronous Comm n Secondary Prototype Card Reserved Parallel Printer Port 1 SDLC or Binary Synchronous Comm n 2 Binary Synchronous Comm n 1 Monochrome Display Printer Local Area Network Color Graphic Monitor Floppy Diskette Controller Asynchronous Comm n Primary To set desired board address refer to the illustrated Board Address setup program on the Utility diskette provided with the card Type the desired address in hexadecimal code and the graphic display shows you how to set the ADDRESS SETUP switches These switches are marked A4 A9 and form a binary representation of the address in negative true logic Assign 0 to all ADDRESS SETUP switches turned ON and assign 1 to all ADDRESS SETUP switches turned OFF NOTE The A4 switch is enabled only if the 1781 PXB1201 card is configured for 96 I O lines The card then occupies 16 bytes of I O space instead of the normal 32 The following example illustrates switch selection corresponding to hex 2D0 or binary 10 1101 xxxx The xxxx represents address lines A3 A2 A1 and AO used on the card to select individual registers at the PPl s See Section 6 PROGRAMMING
11. GRAM ale Lilia e ia 5 OPTION SELEGTION i lana lla 6 OPTION SELEGION MAP nirien ARA Ri 7 ADDRESS SELECTION aaa eraa a ae are aaraa aa ee in iia 8 ADDRESS ASSIGNMENTS FOR PC XT nenne 8 ADDRESS ASSIGNMENTS FOR 286 386 486 i 9 SOFTWARE A renano 10 PXBI2LO0S MA A e LI 10 VISUALBASIC UTILITY DRIVER rnnr 10 PROGRAMMING i tits ie A aa conciencias nai caadade daceddaccecaacdadsdbacaacsecheaase 12 PORT ADDRESS SELECTION TABLE cono nannanancncnicnns 12 PROGRAMMING EXAMPLE nono conan nan nncnnnnnnnnnncannacnnnnns 14 SAMPLE PROGRAMIS iii iaia tata 14 SHARING INTERRUPTS ON THE ISA BUS ii 21 CONNECTOR PIN ASSIGNMENTS ccccoccnccccocnncnnonnnonocconanananananononananananan raro nnnn naaa r nr nnnnnnanana rra nr nnmnnn nnmnnn nn 22 SPECIFICATO NS 0 a 23 Western Reserve Controls 1781 PXB1201 User s Manual INSTALLATION BACKING UP THE DISK The software provided with the 1781 PXB1201 is in MS DOS format on diskette As with any software package you should make backup copies for everyday use and place your original master diskette in a safe location The easiest way to make a backup copy is to use the DOS DISKCOPY utility In a single drive system the command is DISKCOPY A A In a two disk system the command is DISKCOPY A B This will copy the contents of the master disk in drive A to the backup disk in drive B HARD DISK INSTALLATION The file
12. Hex Representation 2 nese Matters 3 pa papa Binary Representafon 1 o 1 1 po ji CAUTION Review the address selection reference table carefully before selecting the card address If the addresses of two installed functions overlap you will experience unpredictable computer behavior Western Reserve Controls 1781 PXB1201 User s Manual SOFTWARE WRC supplies several programs to support the 1781 PXB1201 Digital I O card and also to help you develop your applications software These programs are on a diskette that comes with your card and consist of a Setup program and three sample programs The sample programs are in forms suitable for use with BASIC QuickBASIC C and Pascal The programs as follows e PXB120ST 1781 PXB1201 Board Setup Program o SAMPLE1 A program that writes a sequence of values to Port A and reads and displays the values in Ports A amp B o SAMPLE2 A C program that displays the bits in Ports A 8 B and when an interrupt occurs polls those same bits FINDBASE Program locates active and available port addresses VB_WRC 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 DLL and allows you to access hardware as if the language was designed for it when you use VisualBASIC for Windows PXB120ST This program is supplied with the 1781 PXB1201 card as a tool for you to use
13. careful with address selection If the addresses of two installed functions overlap you will experience unpredictable computer behavior If unsure what locations are available you can use the FINDBASE program provided on our diskette to locate blocks of available addresses 2 Western Reserve Controls 1781 PXB1201 User s Manual To install the card 1 Remove power from the computer Remove the computer cover Remove blank I O backplate Install jumpers for selected options See the OPTION SELECTION section of this manual Select the base address on the card See the ADDRESS SELECTION section of this manual Loosen the nuts on the strain relief bar and swing top end free NO Aa OD Install the card in an I O expansion slot If convenient select a slot which is adjacent to a vacant slot because this will make cable installation easier 8 Thread the I O cables one by one through the cutout in the mounting bracket and plug them into the headers 9 Smooth the cables as close as practicable to the card and while holding them close to the card surface swing the strain relief bar into position and tighten nuts 10 Inspect for proper fit of the card and cables and tighten screws Make sure that the mounting bracket is properly screwed into place and that there is a positive chassis ground 11 Replace the computer cover Input Output connections are via five 50 pin headers on the card A blank mounting bracket is provided wit
14. control If the BEN TST jumper on the card is installed in the BEN position the I O buffers are permanently enabled However if the jumper is placed in the TST position enable disable of the buffers is possible under software control via the Control Register as described in the Software Programming section of this manual Western Reserve Controls 1781 PXB1201 OPTION SELECTION MAP Cable Strain Relief Bar EEEE ananin Fo TST 98B 120B 120 96 IRQ7f Raa Rage TENGE Cagna eee Ina IRa2E cdi ee IRQ1Q Rom RE IRQ15 E IEN1 INP4 IEN2 INP2 IENS INP3 Le IEN4 INP4 User s Manual Western Reserve Controls 1781 PXB1201 User s Manual ADDRESS SELECTION The 1781 PXB1201 Input Output Card occupies 32 bytes of l O space The card base address can be selected anywhere within an l O address range 000 3FF hex If all 120 bits are to be used in an AT class computer the base address can be set anywhere within the address range hex 100 390 except 1F0 through 1F8 If only 96 bits are to be used the base ad
15. d Each PPI contains a control register This Write only 8 bit register is used to set the mode and direction of the ports At Power Up or Reset all I O lines are set as inputs Each PPI should be configured during initialization by writing to the control registers even if the ports are going to be used as inputs Output buffers are automatically set by hardware logic according to the control register Control registers are 12 Western Reserve Controls 1781 PXB1201 User s Manual located at base addresses 3 7 B F and 13 Bit assignments in each of these control registers are as follows Port C Lo C0 C3 1 Port B 1 Input 0 Output Mode Selection 1 Mode 1 0 Mode O Port C Hi C4 C7 1 Input 0 Output 1 0 Input 0 Output Port A Input 0 Output Mode Selection 1 Mode 1 00 Mode 0 1X Mode 2 Mode Set Flag 1 Active NOTE Contact WRC for directions if you wish to operate this card in mode 1 This card cannot be operated in mode 2 1781 PXB1201 provides a means to enable disable the tristate I O buffers under program control If the BEN TST jumper on the card is installed in the BEN position the I O buffers are permanently enabled However if the jumper is placed in the TST position enable disable of the buffers is possible under software control via the Control Register as follows 1 2 The card is initialized in the receive mode by the computer Reset command When bit D7 of the Control Reg
16. dress can be anywhere in the range hex 100 3F0 If to be used in an XT class computer the starting address can be as above except the lowest starting address is 200 hex However two installed options can not share the same address If in doubt where to assign the base address of the 1781 PXB1201 refer to the tables below and consult the FINDBASE program on the utility diskette STANDARD ADDRESS ASSIGNMENTS FOR PC XT COMPUTERS 000 00F DMA Chip 8237A 5 020 021 Interrupt 8259A 040 043 Timer 8253 5 060 063 PPI 8255A 5 080 083 DMA Page Register DAX NMI Mask Register OCX Reserved OEX Reserved 100 1FF Not Usable 200 20F Game Control 210 217 Expansion Unit 220 24F Reserved 278 27F Reserved 2F0 2F7 Reserved 2F8 2FF Asynchronous Comm n Secondary 300 31F Prototype Card 320 32F Fixed Disk 378 37F Printer 380 38C SDLC Communications 380 389 Binary Synchronous Comm Secondary 3A0 3A9 Binary Synchronous Comm Primary 3B0 3BF IBM Monochrome Display Printer 3C0 3CF Reserved 3D0 3DF Color Graphics 3E0 3E7 Reserved 3F0 3F7 Diskette 3F8 3FF Asynchronous Comm n Primary These options can not be used together addresses overlap Western Reserve Controls 1781 PXB1201 User s Manual STANDARD ADDRESS ASSIGNMENTS FOR 286 386 486 COMPUTERS 000 01F 020 03F 040 05F 060 06F 070 07F 080 09F 0A0 OBF 0C0 O0DF OFO OF 1 0F8 OFF 1F0 1F8 200 207 278 27F 2F8 2FF 300 31F 360 36F 378 37F 380 38F 3A0 3AF 3B0 3
17. ement form if meaningful display is required Otherwise values returned from the InPortb function will be 128 to 127 rather than 0 to 255 An alternative is to perform all assignments in hexadecimal rather then decimal form Before the program will execute the GBL file must be modified to include the path to the VB_WRC DLL as appropriate for your system Merely replace the statement VB_WRC DLL with drive path VB_WRC DLL As an alternative to changing the source code you can copy the VB_WRC DLL file into your Windows directory This will allow multiple programs to find the same DLL without having to know where it is located Just omit all references to a path in the GBL file as shown in the sample 11 1781 PXB1201 PROGRAMMING The 1781 PXB1201 is an I O mapped device that is easily configured from any language and any language can easily perform digital I O through the card s ports This is especially true if the form of the data is byte or word wide All references to the I O ports would be in absolute port addressing However a table could be used to convert the byte or word data ports to a logical reference Western Reserve Controls User s Manual DEVELOPING YOUR OWN SOFTWARE If you wish to gain a better understanding of the programs listed in the previous section then the information in the following paragraphs will be of interest to you Follow the 8255 5 Specification in APPENDIX A to program the PPI s on the 1781 PXB120
18. en reading this section of the manual Also refer to the OPTION SELECTION MAP on the following page The card comes with jumpers installed at locations marked 120 and 120B These enable all 120 I O lines on the card If 32 bytes of I O space is not available and 96 or less I O lines are to be used then it is possible to configure the card to occupy only 16 bytes in I O space This will disable Port 4 To select this option move the two jumpers to the locations marked 96 and 96B Base address selection is covered both by the diskette and in the next section of this manual Interrupts are accepted on the I O connector pin 9 port C3 The interrupt signal is positive true Inter rupts are unconditionally enabled if the IEN jumper is installed or enabled by program if the INP jumper is installed and I O connector pin 1 port C is low Interrupts are disabled if a neither the IEN or INP jumper is installed or b if the INP jumper is installed but I O connector pin 1 port C7 is held high User interrupts are directed to interrupts 2 through 7 10 through 12 14 and 15 by jumpers installed at locations labelled IRQ2 through IRQ15 The foregoing are the only manual setups necessary to use the 1781 PXB1201 Input Output selection is done via software by writing to the PPI 8255 5 Control Registers as described in the PROGRAMMING section of this manual 1781 PXB1201 provides a means to enable disable the tristate I O buffers under program
19. h units that are marked for CE European Certification and for these units CE certifiable cable and break out methodology cables connected to ground at the aperture shielded twisted pair wiring etc must be used Western Reserve Controls 1781 PXB1201 User s Manual FUNCTIONAL DESCRIPTION FEATURES 120 Channels of Digital Input Output All 120 I O Lines Buffered on the Board Four and Eight Bit Groups Independently Selectable for I O Hysteresis Correction and Pull Down Resistors on I O Lines Interrupt and Interrupt Disable Capability Tri stateable I O ports under software control 5V Supply Available to User Compatible with Industry Standard I O Racks from WRC others such as Gordos Opto 22 Potter amp Brumfield etc APPLICATIONS Automatic Test Systems Security Systems Energy Management Robotics Relay Monitoring and Control Parallel Data Transfer to PC Sensing switch closures or TTL DTL CMOS Logic Driving Indicator Lights or Recorders The 1781 PXB1201 board was designed for industrial applications and should be installed in a long slot of an IBM PC XT AT or compatible computer Each I O line is buffered and capable of sourcing 15mA or sinking 24mA 64mA on request The board contains five Programmable Peripheral Interface chips type 8255 5 PPI to provide computer interface to 120 digital I O lines Each PPI provides three 8 bit ports A B and C Each 8 bit port can be configured to function as eit
20. her inputs or output latches Port C can also be configured as four inputs and four output latches The I O line buffers 74LS245 are configured automatically by hardware logic for input or output use according to the PPI 8255 5 Control Register direction software assignment The I O buffers may be tristated under program control If the BEN TST jumper on the card is installed in the BEN position the I O buffers are permanently enabled allowing transparent backwards compatibility However if the jumper is placed in the TST position enable disable of the buffers is possible under software control Two I O lines of each port can be used for interfacing User Interrupts to the computer Interrupts are buffered and are enabled by jumper installation or by a combination of jumper installation and a digital input line You can use Interrupts 2 through 7 10 through 12 14 and 15 Interrupts of all ports one per port are OR ed together I O wiring connections are via 50 pin headers on the board Five flat I O cables connect the 1781 PBX1201 to digital mounting boards such as WRC s 1781 Axxx Also this provides compatibility with Dataforth Crydom OPTO 22 Gordos Potter amp Brumfield etc module mounting racks Every second conductor of the flat cables is grounded to minimize the effect of crosstalk between signals If needed for external circuits 5VDC power is available on each I O connector pin 49 If you use this power we recommend that you
21. ing to be armed Press any key to halt program n do arming_stations get_status if kbhit abort 0 while arming_stations old_arming_stations sound 1000 delay 300 nosound printf Alarm system will activate in 15 seconds read_sensors sensors_at_arm old_arming_stations get_status ll start time NULL do while difftime time NULL start 15 printf n printf ALARM SYSTEM ACTIVE AND ARMED n n sound 900 delay 300 nosound J 0 do read_sensors sensors_no0w for i l i lt 16 1i 1f sensors_now i 1 sensors_at_arm i 1 J i for arming_stations get_status if arming_stations old_arming_stations j 1 flag used to signal alarm is de activated while j LL ridi start time NULL printf Alarm deactivated at s asctime gmtime amp start sound 900 delay 300 nosound delay 50 sound 900 delay 100 nosound else printf Sensor d has been activated n n j start time NULL printf The time of alarm is s asctime gmtime start old_arming_stations get_status ALARM else pot for this end used to send program back to await re arm 20 Western Reserve Controls 1781 PXB1201 User s Manual SHARING INTERRUPTS ON THE ISA BUS As noted on page 6 1781 PXB1201 can accept external interrupts via bit C3 at each 24 bit group On occasion however a system ap
22. ister is set high the direction of the three ports of the associated PPI chip as well as the mode can be set For example a write to Base Address 3 with data bit D7 high programs port direction of Port 1 ports A B and C If for example hex 80 is sent to Base Address 3 the Port 0 PPI will be configured in mode 0 with ports A B and C as outputs But at the same time data bit D7 is also latched in a buffer controller for the associated PPI chip A high state disables the buffers and thus all associated buffers will be put in the tristate mode i e disabled 3 When you wish to enable the output buffers send a normal PPI mode command with bit D7 low For example if a control byte of hex 80 had been sent as previously described and it is now desired to open the three ports you can send a control byte of hex 00 to Base Address 3 to enable the port O buffers Those buffers will now remain enabled until another control byte with data bit D7 high is sent to Base Address 3 Those buffers will now remain enabled until another control byte with data bit D7 high is sent to Base Address 3 NOTE All data bits except D7 must be the same for the two control bytes 13 Western Reserve Controls 1781 PXB1201 User s Manual PROGRAMMING EXAMPLE The following programming example is provided as a guide to assist you in developing your working software In this example the card base address is 2D0 hex and I O lines of Port 0 are to be setup a
23. key 13 the repeat until loop gives the user an opportunity to shut open windows or doors and then re scan the sensors clrscr TRUE do begin this WHILE is used to form an infinite loop writeln Waiting to be armed or press any key to halt program repeat this repeat until loop continues until arming arming_stations get_status station status changes indicating arming if key pressed then halt 1 arming or until a key is pressed terminatingthe program until arming stations lt gt old arming stations sound 900 short tone indicating alarm has been armed delay 300 nosound E ot oy writeln Alarm system will activate in 15 seconds read_sensors sensors_at_arm old_arming_stations get_status gettime hour min sec hun this code reads the system clock i sec 15 for the current time which is if i gt 60 then i i 60 used to delay for 15 seconds repeat gettime hour min sec hun until sec i end of delay loop writeln writeln ALARM SYSTEM ACTIVE AND ARMED sound 900 short tone indicating that alarm delay 300 is fully activated no sound 3 0 the following code compares current status of sensors against status when armed to determine if break in has occurred Any change indicates break in repeat read_sensors sensors_now for i 1 to 16 do begin if sensors_now i 1 lt
24. ming_stations get_status this activates 4 alarm outputs and then toggles if arming_stations old arming_stations Port C Hi LSB which might be used with an external speaker temp 2000000000 dis armed outportb BASEADDR 2 inportb BASEADDR 2 0x10 while temp 2000000000 nosound procedure ALARM main time_t start initialize clscr goto 5 5 A IOD card demonstration program simulates an alarm n printf system program for 16 sensors four arming stations and n printf four separate alarm outputs which could be routed to an printf siren lights silent alarm etc n printf An print THIS PROGRAM IS FOR DEMONSTRATION PURPOSES ONLY AND IS n printf NOT MEANT TO BE USED AS AN ACTUAL ALARM SYSTEM n printf n printf n printf Press any key to begin program n key getch old_arming_stations get_status do clrscr read_sensors sensors_now for i 0 i lt 15 1i if sensors_now i printf Sensor d s n i is open 19 Western Reserve Controls 1781 PXB1201 User s Manual forle PEIMEEIAGO printf Press ESC to re scan RETURN to begin alarm scanning key getch while key 13 clrscr i this creates an infinite loop printf Wait
25. n an integer Declaration function InPortb byval address as integer as integer InPort 10 Western Reserve Controls 1781 PXB1201 User s Manual Function Reads an integer from a hardware port This function returns the 16 bit value obtained from reading the low byte from address and the high byte from address 1 Declaration function InPort byval address as integer as integer OutPortb Function Writes the lower eight bits of value to the hardware port at address This function returns the value output Declaration function OutPortb byval address as integer byval value as integer as integer OutPort Function Writes all 16 bits of value to the hardware port at address This function returns the value output Declaration function OutPort byval address as integer byval value as integer as integer Peek Function Reads a byte from main memory DRAM Declaration function Peek byval segment as integer byval offset as integer as integer Poke Function Writes the lower eight bits of value to segment offset Declaration function Poke byval segment as integer byval offset as integer byval value as integer as integer Note that in all of the above functions an inherent limitation of BASIC in general and VisualBASIC in particular makes the values sent less intuitive All integers in BASIC are signed numbers wherein data are stored in two s complement form All bit patterns must be converted to and from this two s compl
26. plication will require more interrupt levels than are available on the ISA bus While not recommended IRQ sharing is possible Each card that is going to share an IRQ must strictly adhere to a special standard for accessing the IRQ line as follows 1 The interrupt must be held in a high impedance state until asserting an interrupt 2 The interrupt must be asserted in the form of a low signal lasting at least 500 nanoseconds followed by a rising edge and then immediately returning to a high impedance condition 3 The card must contain a status register or flag of some kind to indicate that it generated the interrupt There is an exception to this rule This is the case where only one card of those sharing the interrupt level does not provide a status bit to indicate that it asserted the interrupt but is otherwise capable of sharing the IRQ In this case it may share the interrupt level with other cards if a it is the only card on that IRQ level that does not have a status bit and b it is installed onto the IRQ vector first This makes it the last card to be called in the vector chain This scheme will work because it can be assumed that if every other card in the vector chain did not cause the interrupt then the last card must be the one that did Note that if two cards assert the IRQ line within 500 nanoseconds of each other the second card in the ISR chain will not be serviced It s possible to alleviate this problem by writing a single
27. rm ON OFF har key useful temporary variable nt i useful temporary variable used in loops nt 3 useful temporary variable nitialize outportb BASEADDR 3 0x93 outportb addr byte is C s method of accessing port memory This procedure sets cPort A B and C LO as inputs and Port C Hi as outputs Address hex 303 is the control register The bit pattern needed to set the desired mode and port designation is 10010011 93 hex procedure initialize read_sensors int ary unsigned char tempA unsigned char tempB tempA inportb BASEADDR tempB inportb BASEADDR 1 for 1 0 1 lt 8 1 if tempA gt gt i amp ON this determines if bit i is on and sets the corresponding array element to ON if ary 0N it is If not sets the array to OFF else 18 Western Reserve Controls 1781 PXB1201 User s Manual ary 0FF for 1 0 1 lt 8 1 if tempB gt gt i amp ON ary 0N else ary 0FF procedure read_sensors get_status int temp temp inportb BASEADDR 2 this sets status to the lower half of Port C for four arming switches return temp amp 0x0F function get_arming_status ALARM long int temp 0 sound 2000 this starts the computer s speaker outportb BASEADDR 0xF0 this sets Port C upper nibble bits to ON 1111 binary F hex do ar
28. s contained on the master diskette may also be copied onto your hard disk To do this perform the following 1 Place the master diskette into a floppy drive 2 Change the active drive to the drive that has the master diskette installed For example if the diskette is the A drive type A 3 Type INSTALL and follow the screen prompts Files contained on the disk are stored in separate directories as follows ROOT DIRECTORY Contains the FINDBASE PROGRAM that will help you to decide what base address to use with the card Also contains the PXB1201ST EXE setup program PSAMPLES Contains Pascal samples and the Pascal linkable driver CSAMPLES Contains C samples and the C linkable driver BSAMPLES Contains the BASIC and QuickBASIC samples as well as the binary and linkable drivers VB_WRC VisualBASIC utility driver that includes PEEK and POKE statements for reading and writing RAM as well as OUTPORT and INPORT for reading and writing port YO The driver is in the form of a DLL and allows you to access hardware as if the language was designed for it when you use VisualBASIC for Windows INSTALLING THE CARD Before installing the card carefully read the ADDRESS SELECTION and OPTION SELECTION sections of this manual and configure the card according to your requirements Use the special software program called PXB1201ST provided on diskette with the card It supplies visual aids to configure all areas of the board Be especially
29. s follows portA Input port B Output port C hi Input port C lo Output Configure bits of the Control Register as D7 D6 D5 D4 D3 D2 D1 DO 1 0 0 1 o o o Port C Lo output Port B output Mode 0 Port C Hi input Port A input Mode 0 Mode 0 Active Mode Set This corresponds to 98 hex If the card base address is 2D0 hex use the BASIC OUT command to write to the control register as follows 10 BASEADDR amp H2D0 20 OUT BASEADDR 3 amp H98 To read the inputs at Port A and the upper nybble of Port C use the BASIC INPUT command 30 X INP BASEADDR Read Port A 40 Y INP BASEADDR 2 16 Read Port C Hi To set outputs high 1 at Port B and the lower nybble of Port C 50 OUT BASEADDR 1 amp HFF Turn on all Port B bits 60 OUT BASEADDR 2 amp HF Turn on all bits of Port C Lo SAMPLE PROGRAMS The following sample programs are in TURBO C and TURBO PASCAL languages They cover a security system that allows you to monitor the status of 16 switches and to automatically trigger four alarms that can be used to turn on lights activate a siren or send a signal to a silent alarm The alarm system in this demonstration has four arming stations which toggle the alarm on or off These programs are also provided on the diskette that WRC supplied with your IOD card 14 Western Reserve Controls TURBO PASCAL PROGRAM 1781 PXB1201 User s Manual
30. uts and then old_arming_stations then toggles port C na Hi s LSB which might be used with an external siren port BASEADDR 2 port BASEADDR 2 XOR 10 temp temp 1 until temp gt 2000000000 nosound procedure ALARM initialize_board clrscr gotoxy 5 5 writeln This is the IOD card demonstration program This writeln program will simulate an alarm system program for writeln sixteen sensors and four arming stations along with writeln four separate alarm outputs which could be routed to writeln a siren lights silent alarm etc writeln writeln THIS PROGRAM IS INTENDED FOR DEMONSTRATION PURPOSES writeln ONLY AND IS NOT MEANT TO BE USED AS AN ACTUAL ALARM writeln SYSTEM writeln writeln writeln Press any key to begin program key readkey old_arming_stations get_status this loads the status of the arming switches at the time the repeat program is first activated A clrscr read_sensors sensors_now for i 0 to 15 do begin if sensors_now i 0FF then teln Sensor i is open wri end writeln writeln Press ESC to re scan 16 change in status would indicate arming this reads the current status of the sensors which is then displayed to indicate open windows etc R ETURN to begin scanning Western Reserve Controls 1781 PXB1201 User s Manual WHIL key readkey until
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