IOD-144 Manual - ACCES I/O Products
Contents
1. o SAMPLE2 A C program that displays the bits in Ports A amp B and when an interrupt occurs polls those same bits FINDBASE Program locates active and available port addresses o VBACCES _AVisualBASIC utility driver that includes PEEK and POKE statements for reading and writing RAM as well as I NPORT 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 SETUP EXE This program is supplied with the IOD 144 card as a tool for you to use in configuring jumpers and switches on the card It 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 It does not require the IOD 144 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 SETUP EXE followed by the ENTER key 5 1 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL WINDOWS UTILITY DRIVERS ACCES provides drivers for use with 16 and 32 bit Windows languages ACCES32 a 32 bit driver provides hardware register access when writing software for Windows 95 98 NT The same har2. repeat at the time the program is first activated A clrscr change in status would indicate arming would indicate arming read sensors sensors now this reads the current status of the sensors for i 0 to 15 do begin which is then displayed to indicate open if sensors_now i OFF then windows etc writeln Sensor i is open end writeln writeln Press ESC to re scan RETURN to begin alarm scanning key readkey until key 13 the repeat until loop gives the user an opportunity to shut open windows or doors and then re scan the sensors clrscr WHILE 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 terminating the program 6 7 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL until arming stations lt gt old arming stations sound 900 short tone indicating alarm has been armed delay 300 nosound Uu 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
3. OFF procedure read_sensors get_status int temp temp inportb BASEADDR 2 _ this sets status to the lower half of Port C the of Port C half defined in Initialize to be input for four arming switches return temp amp OXOF function get_arming_status ALARM long int temp 0 sound 2000 this starts the computer s speaker outporto BASEADDR 0xF0 this sets Port C upper nybble bitsto ON 1111 binary F hex dol arming_stations get_status this activates 4 alarm outputs and then toggles if arming stations l old arming stations Port C Hi LSB which might be used temp 2000000000 dis armed with an external speaker outportb BASEADDR 2 inportb BASEADDR 2 0x10 while temp 2000000000 nosound procedure ALARM 6 10 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL main time_t start initialize clscr goto 5 5 printf This 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 a n printf siren lights silent alarm etc n printf n printf 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 dol
4. 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 card mounting bracket is properly screwed into place and that there is a positive chassis ground 11 Replace the computer cover AON NO Input Output connections are via six 50 pin headers on the card A blank mounting bracket is provided with 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 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL FUNCTIONAL DESCRIPTION FEATURES 144 Channels of Digital Input Output All 144 I O Lines Buffered on the Board Four and Eight Bit Groups Independently Selectable for I O Hysteresis Correction and Pull Down Resistors on VO 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 like Opto 22
5. We may suggest some simple tests to confirm the failure We will assign a Return Material Authorization RMA number which must appear on the outer label of the return package All units components should be properly packed for handling and returned with freight prepaid to the ACCES designated Service Center and will be returned to the customer s user s site freight prepaid and invoiced COVERAGE First Three Years Returned unit part will be repaired and or replaced at ACCES option with no charge for labor or parts not excluded by warranty Warranty commences with equipment shipment Following Years Throughout your equipments lifetime ACCES stands ready to provide on site or in plant service at reasonable rates similar to those of other manufacturers in the industry EQUIPMENT NOT MANUFACTURED BY ACCES Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms and conditions of the respective equipment manufacturer s warranty GENERAL Under this Warranty liability of ACCES is limited to replacing repairing or issuing credit at ACCES discretion for any products which are proved to be defective during the warranty period In no case is ACCES liable for consequential or special damage arriving from use or misuse of our product The customer is responsible for all charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or if in ACCES opinion the eq
6. 0 1X Mode 2 Mode Set Flag 1 Active NOTE Contact ACCES for directions if you wish to operate this card in mode 1 This card cannot be operated in mode 2 IOD 144 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 VO 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 a The card is initialized in the receive mode by the computer Reset command 6 2 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL b When bit D7 of the Control Register 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 C 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
7. Ae Ah SC EEE 5 1 WINDOWS UTILITY DRIVERS 5 2 PROGRAMMING tics asus woe tiene etd x oes N ees DS 6 1 PORT ADDRESS SELECTION TABLE 6 1 PROGRAMMING EXAMPLE 6 4 SAMPLE PROGRAMS EES o nU Uog 6 5 SHARING INTERRUPTS ON THE ISA BUS 6 13 CONNECTOR PIN ASSIGNMENTS 7 1 SPECIFICATIONS se more een 8 1 WARRANTY Es EE ited EE 112222 a es 9 1 PPI DATASLHEETS SE ES RE SE Ge ert A 2 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL 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 require ments Use the special software program called SETUP EXE provided on diskette with the card It supplies visual aids to configure all areas of the board Be especially 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 To install the card Remove power from the computer Remove the computer cover Remove blank I O backplate Install jumpers for selected options See OPTION SELECTION section of this manual 5 Select the base address on the card See ADDRESS SELECTION section of this manual Loosen the nuts on the strain relief bar and swing top end free
8. Groups Independently Selectable for VO Hysteresis Correction and 1KQ Pull Down Resistors on VO Lines Interrupt and Interrupt Disable Capability Tristate able outputs 5V Supply Available to User Compatible with Industry Standard VO Racks like Opto 22 Potter amp Brumfield etc Digital 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 8 1 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL WARRANTY Prior to shipment ACCES equipment is thoroughly inspected and tested to applicable specifications However should equipment failure occur ACCES assures its customers that prompt service and support will be available All equipment originally manufactured by ACCES which is found to be defective will be repaired or replaced subject to the following considerations TERMS AND CONDITIONS If a unit is suspected of failure contact ACCES Customer Service department Be prepared to give the unit model number serial number and a description of the failure symptom s
9. clrscr read_sensors sensors_now for i O i lt 15 i if lsensors_nowJ i printf Sensor d s n i is open printf n printf Press ESC to re scan RETURN to begin alarm scanning key getch while key 13 clrscr for this creates an infinite loop printf Waiting to be armed Press any key to halt program n do arming_ stations get_status if Kbhit abort O 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 start time NULL 6 11 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL dol 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_now for i 1 i lt 16 i if sensors nowli 1 sensors at armli 1 JE for arming stations get_status if arming_stations old_arming_stations j 1 flag used to signal alarm is de activated while j ifj 1 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 amp start old_arming_stations get_status ALARM
10. gettime hour min sec hun until sec i end of delay loop writeln writelnCALARM SYSTEM ACTIVE AND ARMED sound 900 short tone indicating that alarm delay 300 is fully activated no sound j 0 the following code compares current status of sensors against status when armed to determine if break in has occurred break in has occurred Any change indicates break in repeat read_sensors sensors_now for i 1 to 16 do begin if sensors nowli 1 lt gt sensors_at arm i 1 then j 1 end for arming_stations get_status if arming_stations lt gt old_arming_stations then i flag used to signal that alarm is 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 delay 50 sound 900 6 8 DIGITAL INPUT OUTPUT CARD delay 100 nosound end else if alarm begin IOD 144 USER MANUAL end of disarming routine writeln Sensor j has been activated gettime hour min sec hun writeln The time of alarm is hour min sec ALARM end end end TURBO C PROGRAM define BASEADDR 0x300 define ON 1 define OFF O include stdio h include conio h include time h include dos h int sensors_at_arm 15 int s
11. in an AT class computer the base address can be set anywhere within the address range hex 100 390 except 1FO through 1F8 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 IOD 144 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 OAX NMI Mask Register 0CX 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 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL 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 hexade
12. latter IOD 144 BLOCK DIAGRAM ADDRESS DECODE AND BUS INTERFACE DATA BUFFERS IRQ INTERRUPT LEVEL SELECT ENABLE EXTERNAL INTERRUPT TYPICAL OF SIX 6 PORT C HI PORT C LO COMPUTER ISA BUS JOo omzzoo 2 2 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL OPTION SELECTION Refer to the illustrated setup programs on the diskette provided with the card when reading this section of the manual Also refer to the OPTION SELECTION MAP on the following page 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 Interrupts are unconditionally enabled if the IEN jumper is installed or enabled by program if the INP jumper is installed and VO 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 labeled IRQ2 through IRQ15 The foregoing are the only manual setups necessary to use the IOD 144 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 IOD 144 provides a means to enable disable the tristate I O buffers under pr
13. the three ports you can send a control byte of hex 00 to Base Address 3 to enable the port 0 buffers NOTE All data bits except D7 must be the same for the two control bytes C 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 6 3 DIGITAL INPUT OUTPUT CARD IOD 144 USER 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 as follows port A Input port B Output port C hi Input port C lo Output Configure bits of the Control Register as D7 D D5 DA D3 D2 Di DO 1 0 0 1 1 0 0 0 ___ 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 H2DO 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 6 4 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL To set outputs high 1 at Port B and the lower nybbl
14. ACCES V O PRODUCTS INC 10623 Roselle Street San Diego CA 92121 tel 858 550 9559 FAX 858 550 7322 DIGITAL INPUT OUTPUT CARD MODEL IOD 144 USER MANUAL File MIOD144 B2 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL NOTICES The information in this document is provided for reference only ACCES 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 ACCES nor the rights of others IBM PC PC XT and PC AT are registered trademarks of the International Business Machines Corporation Printed in the USA Copyright 1998 by ACCES I O PRODUCTS INC 10623 Roselle Street San Diego CA 92121 All rights reserved DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL TABLE OF CONTENTS INSTALLATION ars se ce Sad AAG GU RE AG SA Ge ie 1 1 GD INSTALLATION 444 oa eet un ei ea ed 1 1 3 5 INCH DISKETTE INSTALLATION 1 1 DIRECTORIES CREATED ON THE HARD DISK 1 2 INSTALLING THE CARD 1 4 FUNCTIONAL DESCRIPTION 2 1 BLOCK DIAGRAM sees as sopie een ae 2 2 OPTION SELECTION i eu aus ne aaa AR A 3 1 OPTION SELECTION MAP 3 2 ADDRESS SELECTION i 2 228 eae ues eases 4 1 ADDRESS ASSIGNMENTS FOR PC XT 4 1 SOFTWARE ee Bee ees 5 1 SETUP EXE ceu hte anes O
15. 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 IOD 144 board was designed for industrial applications and should be installed in a long slot of an IBM PC XT AT or compatible computer Each VO 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 in terface to 144 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 either inputs or output latches Port C can also be configured as four inputs and four output latches The VO line buffers 74LS245 are configured automatically by hardware logic for input or output use ac cording to the PPI 8255 5 Control Register direction software assignment The VO 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
16. cimal 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 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 PPls See Section 6 PROGRAMMING Hex Representation 2 o o Conversion mutipiers 2 8 a 2 4 Binary Representation 1 o 1 1 o 4 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 4 2 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL SOFTWARE ACCES supplies several programs to support the IOD 144 Digital VO 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 SETUP EXE IOD 144 Board Setup Program SAMPLE1 A program that writes a sequence of values to Port A and reads and displays the values in Ports A amp B
17. dware level access is provided for 16 bit applications using VBACCES a 16 bit driver for VisualBASIC 3 0 Both drivers are in the form of a DLL and sample code is included that demonstrates their use 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 using the four functions listed below To use VBACCES you must create a MAK file File I New Project similar to the sample provided or else modify your existing project file and include the GBL file File Add File To use ACCES32 refer to the sample code for the language specific commands for adding the DLL to the project InPortb Function Reads a byte from a hardware port Due to limitations of VisualBASIC the number is returned in an integer Declaration function InPortb byval address as integer as integer InPort 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 addre
18. e 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 USER 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 PPIs on the IOD 144 Digital Input Output Card A total of 24 address locations are used by the IOD 144 for addressing the PPIs four for each PPI The PPls 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 Base Address 14 Base Address 15 Base Address 16 Base Address 17 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 PA Port 5 PB Port 5 PC P
19. e 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 ACCES supplied with your IOD card TURBO PASCAL PROGRAM CONST BASEADDR 300 declare base address for IOD card CONST ON declare some useful constants CONST OFF 0 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 va
20. else for this end used to send program back to await re arm 6 12 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL SHARING INTERRUPTS ON THE ISA BUS As noted on pages 2 1 and 3 1 IOD 144 can accept external interrupts via bit C3 at each 24 bit group On occasion however a system application 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 a The interrupt must be held in a high impedance state until asserting an interrupt 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 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
21. enabled by jumper installation or by a combination of jumper installation and a digital input line You can use Interrupts 2 through 7 10 2 1 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL through 12 14 and 15 Interrupts of all ports one per port are OR ed together VO wiring connections are via 50 pin headers on the board Six flat I O cables connect IOD 144 to termination panels such as ACCES model STA 50 Also this provides compatibility with 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 include a 1A fast blow fuse in your circuits in order to avoid possible damage to the host computer The board occupies 24 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 Utility software provided on diskette with the IOD 144 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
22. ensors_now 15 int arming stations int_old_arming_stations char key int i int j initialize outporto BASEADDR 3 0x93 procedure initialize else WHILE this end sends the program back to wait to be re armed declare base address for IOD card create useful constant ig bit by bit status of sensors at current time When compared against status of sensors at arm indicates p break in if there is a change variables representing all four arming stations If the value changes toggle alarm ON OFF useful temporary variable useful temporary variable used in loops useful temporary variable 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 6 9 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL read_sensors int ary unsigned char tempA unsigned char tempB tempA inportb BASEADDR tempB inportb BASEADDR 1 for i 0 i lt 8 i if tempA gt gt i amp ON this determines if bit i is on and sets the corresponding ary ON array element to ON if it is If not sets the array else to OFF ary OFF for i 0 i lt 8 i if tempB gt gt i amp ON ary ON else ary
23. er nybble of Port temp port BASEADDR 2 the half defined by Initialize to be input for get_status temp AND 0F four arming switches end function get_arming_status procedure ALARM var temp longint begin sound 2000 this starts the computer s speaker which acts as siren for the alarm temp 0 port BASEADDR 2 F this sets Port C s lower nybble bits to ON repeat arming_stations get_status this activates four alarm outputs and then if arming_stations lt gt old_arming_stations then toggles Port C Hi s LSB which temp 2000000000 disarmed might be used with an external siren port BASEADDR 2 port BASEADDR 2 XOR 10 temp temp 1 until temp gt 2000000000 6 6 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL nosound end procedure ALARM begin initialize_board clrscr gotoxy 5 5 writeln This i 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
24. 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 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 6 13 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL CONNECTOR PIN ASSIGNMENTS Six 50 pin headers are provided on the IOD 144 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 Assignment Pin assignment en _ 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 PC1 Port C Lo PCO Port B Port B Port B Port B Port B Port B Port B Port B PortA Port A PortA Port A Port A Port A Port A PortA PAO 45 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 7 1 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL SPECIFICATIONS Features 144 Channels of Digital Input Output All 144 VO Lines Buffered on the Board Four and Eight Bit
25. ogram 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 3 1 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL OPTION SELECTION MAP 29329 Cable Strain Relief Bar IENSI aun II nel ER SER HER N a ENA ET EE EE DEE Kral ER RE EE IEN3 EE INPal EE VR HR a Y E IEN2 TEE ET EE EE Pal HEHE EIERS EL ENT TEE EE ER ET ET nei ed EE montero FENG essen nn na NPA e n de HE EE DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL ADDRESS SELECTION The IOD 144 Input Output Card occupies 24 bytes of VO space The card base address can be selected anywhere within an I O address range 000 3FF hex If all 144 bits are to be used
26. ort 5 Control Port 5 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 Read Write Read Write Read Write Write Only DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL The IOD 144 uses six 8255 5 PPIs to provide a total of 144 bits input output capability The card is designed to use each of these PPls 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 latched 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 located at base addresses 3 7 B F and 17 Bit assignments in each of these control registers are as follows Port C Lo C0 C3 1 Input O Output Port B 1 Input O Output Mode Selection 1 Mode 1 0 Mode 0 Port C Hi C4 C7 1 Input 0 Output Port A 1 Input O Output Mode Selection 01 Mode 1 00 Mode
27. riable used in loops VAR j integer procedure initialize_board this procedure sets MODE 0 as active and sets and sets Port 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 6 5 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL end procedure initialize_board procedure read_sensors VAR ary sensor_ary VAR tempA byte this procedure fetches data from Ports A VAR tempB byte and B and returns a binary representation of each sensor begin tempA port BASEADDR this procedure loads tempA and tempB with cor responding 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 is ON and sets the ary i ON corresponding array element to ON if it is else else the array element is set to OFF ary i OFF end for i 0 to 7 do begin if tempB shr i AND ON gt 0 then ary i 8 ON in order to get Port B into array elements else 8 thru 15 we add 8 to the bit numbers in ary i 8 OFF in the assignment end end procedure read sensors function get_status integer var temp integer begin this sets status to the low
28. ss This function returns the value output 5 2 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL Declaration function OutPort byval address 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 complement 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 VBACCES DLL as appropriate for your system Merely replace the statement VBACCES DLL with drive path VBACCES DLL As an alternative to changing the source code you can copy the VBACCES 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 leave off all references to a path in the GBL file as shown in the sample 5 3 DIGITAL INPUT OUTPUT CARD IOD 144 PROGRAMMING The IOD 144 is an VO mapped device that is easily configured from any language and any language can easily perform digital VO through the card s ports This is especially true if th
29. uipment has been subjected to abnormal use Abnormal use for purposes of this warranty is defined as any use to which the equipment is exposed other than that use specified or intended as evidenced by purchase or sales representation Other than the above no other warranty expressed or implied shall apply to any and all such equipment furnished or sold by ACCES 9 1 DIGITAL INPUT OUTPUT CARD IOD 144 USER MANUAL APPENDIX A PPI DATA SHEETS The data sheets in this Appendix are provided to help your understanding of the 8255 5 PPI which is manufactured by several companies These data sheets are reprinted with permission of Mitsubishi Electric Corporation Copyright 1987 The information diagrams and all other data included are believed to be correct and reliable However no responsibility is assumed by ACCES or Mitsubishi Electric Corp for their use nor for any infringement of patents or other rights belonging to third parties which may result from their use The values shown on these sheets are subject to change for product improvement A 2
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