Advantech PCL-848A/B User manual

PCL-848A/B
MULTIFUNCTION IEEE-488
INTERFACE CARD

Part No. 2003848000 Rev. A1
Printed in Taiwan Apr 2001
PCL-848A/B MULTIFUNCTION
IEEE-488 INTERFACE CARD
USER’S MANUAL
This documentation and software routines contained in the PCL848A/B software
diskette are copyrighted 1989 by Advantech Co.. Ltd. All rights are reserved.
Advantech Co., Ltd. reserves the right to make improvements of the products
described in this manual at any time without notice.
No part of this manual may be reproduced, copied, translated or transmitted, in any
form or by any means without the prior written permission of Advantech Co., Ltd.
Information provided in this manual is intended to be accurate and reliable.
However, Advantech Co., Ltd. assumes no responsibility for its use; nor for any
infringements of rights of third parties which may result from its use.
PC-LabCard is a trademark of Advantech Co., Ltd. IBM and PC are trademarks of
International Business Machines Corporation. MSDOS and QuickBASIC are trade
marks of Microsoft Corporation BASIC is a trademark of Dartmouth College. Intel is
a trademark of Intel Corporation. Nl PC-II is a trademark of National Instruments.

Contents
1. GENERAL INFORMATIQN..................................................................1
1.1. Introduction to the Product ......................................................................... 1
1.2. Description of the Documentation .............................................................. 2
2. INSTALLATION......................................................................................4
2.1. Inspection .................................................................................................... 4
2.2. Switch and Jumper Setting ......................................................................... 4
2.2.1. I/O Base Address and Wait State Setting .......................................................... 5
2.2.2. Firmware Address Setting ................................................................................. 6
2.2.3. Operating Mode Setting ..................................................................................... 7
2.2.4. DMA Level Setting ............................................................................................ 7
2.2.5. Interrupt Level (IRQ) Setting .............................................................................. 7
2.3. Installing the Card ....................................................................................... 7
2.3.1. Preparation ....................................................................................................... 7
2.3.2. Installing the Card into a PC ............................................................................. 8
2.3.3. Function Check ................................................................................................. 9
3. PROGRAMMING REFERENCE ........................................................10
3.1. Introduction ............................................................................................... 10
3.2. Using the BASIC CALL Statement ........................................................... 11
3.3. Using QuickBASIC and BASIC Compiler ................................................. 13
3.4. The IEEE-488 Driver Routines ................................................................. 13
3.4.1. AHORT ........................................................................................................... 14
3.4.2. DEVCLR (Device Clear) Purpose : ................................................................. 15
3.4.3. DEVICE .......................................................................................................... 16
3.4.4. ENTER Purpose : ........................................................................................... 17
3.4.5. ENTERA ......................................................................................................... 18
3.4.6. EOL ................................................................................................................ 20
3.4.7. INIT ................................................................................................................. 21
3.4.8. LLO ................................................................................................................. 23
3.4.9. LOCAL ............................................................................................................ 24
3.4.10. OUTPUT Purpose : ........................................................................................ 25
3.4.11. OUTPUTA ...................................................................................................... 26
3.4.12. PPOLL ............................................................................................................ 28
3.4.13. PPOLLC ......................................................................................................... 29
3.4.14. PPOLLU ......................................................................................................... 31
3.4.15. REHOTE ........................................................................................................ 32
3.4.16. SEND ............................................................................................................. 33
3.4.17. SPOLL ............................................................................................................ 35
3.4.18. STATUS Purpose : ......................................................................................... 36
3.4.19. TIMEOUT Purpose : ....................................................................................... 37

3.4.20. TRIGGER Purpose : ....................................................................................... 38
3.4.21. ERRPTR ........................................................................................................ 39
4. PROGRAMMING TECBNIQUES ......................................................41
4.1. Interactive Data Transfer .......................................................................... 41
4.2. Set IEEE-488 Printer ................................................................................ 43
4.3. Voltage Measurement with a DVM ........................................................... 44
4.4. AD500 PMU Programming ....................................................................... 45
4.5. Multiple Device Triggering ........................................................................ 47
4.6. Interrupt Handling ..................................................................................... 49
5. ADVANCED PROGRAMM1N~ TECBNIQUES ...............................51
5.1. Direct Memory AcceAs (DMA) .................................................................. 51
5.2. Transfer Speed ......................................................................................... 54
5.3. Interrupt ..................................................................................................... 55
5.4. Hore about the SEND Command ............................................................. 56
6. DIGITAL OUTPUT ...............................................................................57
7. TBEORY OP OPERATION..................................................................58
7.1. Introduction ............................................................................................... 58
7.2. Block Diagram Description ....................................................................... 58
8. TROUg3LB5BOOTING........................................................................60
8.1. Introduction ............................................................................................... 60
8.2. Periodia Maintenance ............................................................................... 60
8.3. Troubleshooting Procedure ....................................................................... 60
8.4. Part List ..................................................................................................... 62
9. BUS TUTORIAL....................................................................................64
9.1. General Bus Description ........................................................................... 64
9.2. Bus Structure ............................................................................................ 66
9.2.1. IEEE-488 Connector Pin Assignment ............................................................. 66
9.2.2. IEC-625 Connector Pin Assignment ................................................................ 67
9.3. Management Lines ................................................................................... 67
9.4. Bus Commands ........................................................................................ 68
9.5. Servioe Request and Serial Polling .......................................................... 68
9.6. Parallel Polling .......................................................................................... 69
9.7. Code Summary ......................................................................................... 69
9.8. Randshake Lines ...................................................................................... 71
9.9. Other Bus Lines ........................................................................................ 73
9.10. Bus Operating Considerations .................................................................. 73

10. ASCII TABLE ......................................................................................74
11. NEC7210 RBAD / WRITE REGISTSR.............................................76
12. SUMMARY OF TBE IEEE-488 LIBRARY FUNCTIONS .............77

Figures
Fig. 2.2 Location of switches and jumpers ................................................... 4
Fig. 7-1 PCL-848A/B Block Diagram ................................................................ 59

CHAPTER 1 GENERAL INFORMATIQN 1
1. GENERAL INFORMATIQN
1.1. Introduction to the Product
The PCL-848A/B IEEE-488 interface card is a valuable addition to your PC that
allows you to communicate with over 2000 products, made by over 200 manufactur-
ers, in over 14 countries. The IEEE488-1978 standard that this IEEE-488 card
implements is the most widely used international standard for information transfer
between computer and electronic instruments. There are numerous publications and
articles that may be used in conjunction with this manual to assist you to understand
the interface standard. The IEEE reference document may be ordered by writing to the
IEEE Service Center, 445 Uoes Piscataway, NJ 08854, USA.
The IEEE-488 interface card provides the hardware (electrical and mechanical) and
software required for you to interface your PC to the IEEE-488 bus. The software is
packaged in read-only-memory (firmware) to provide versatile and easy-to-use IEEE-
488 function extensions for your current programming language or operating system.
Firmware cannot be accidentally erased or overwritten and it is always available for
use by application programs. This manual provides a programming reference (Section
3.) and programming techniques (Section 4. and 5.) to assist you in writing your own
application programs.
The key features of this interface card include:
*Operating in one of the two modes (switch selectable).
Mode A : Compatible with PCL-748 and use the on-board firmware driver.
Mode N : Software compatible with National Instrument PC-II and IBM-PC GP-
IB adaptor and use the driver and software developed for them.
*Implementation of the entire IEEE-488 standard.
*Powerful and easy-to-use software command set. Fewer arguments and simple
initialization.
*Software driver is in on-board firmware. Requires no additional disk operation when
using BASIC or Turbo Pascal.
*On-board RAM for working space. No system memory space is needed for the
IEEE-488 interface operation.
*Built-in 16 bit digital output port provides a convenient and economical solution for
signal switching and digital control applications. The D/O port is compatible with
the daughter boards: PCLD-785 Relay Output Eoard, PCLD-786 SSR & Relay
Driver Board and PCL-789 Amplifier Multiplexer Board.

2PCL-848AB User's Manual
BASICA, BASIC compiler and Quick-BASIC are supported as standard languages. C
and Pascal language support packages can be ordered separately as PCL-748-C and
PCL-748-P.
The software can change the PC printer port to an IEEE-488 device. The PrtSc (print
screen) key, all print statements, word processing and spreadsheet programs that use
printer driver in BIOS can use IEEE-488 printers.
*High speed direct memory access (DMA) with the ability to handle 64K byte
arrays.
*Programmable system controller, active controller or device functions.
*All device functions, addresses, interrupt conditions, and parallel poll responses are
programmable.
*Automatic initialization. Interface parameters are set to default when starting using
the interface. Parameters can still be changed by calling the initialization routine.
*DIP switch selectable wait states (0/2/4/6 wait states) to ensure the compatibility to
very high speed PC’s.
*PCL-848A offers the connectors of the IEEE-488 standard while PCL-848B uses
the 25 pin D type connectors for the IEC-625 standard.
*Each device on the IEEE-488 bus can be assigned with its own terminator.
1.2. Description of the Documentation
Information in this manual is given at several levels of detail and is organized to allow
you to work through the TUTORIAL, PROGRAHMING REFERENCE and
PROGRAMMING TECHNIQUES sections.
If you have no IEEE-488 experience, go to Section 9. after this section.
The IEEE-488 TUTORIAL in Section 9. is designed to give you a thorough under-
standing of how the IEEE-488 General Purpose Interface Bus (GP-IB) works. Topics
in the TUTORIAL should be read in sequence if you have no IEEE-488 background
and intend to write application programs. With a solid understanding of the basic
IEEE-488 concepts, followed by returning to the PROGRAMMING REFERENCE,
and the PROGRAMMING TECHNIQUES, you should be able to program almost
any IEEE-488 bus system without interface problems.

CHAPTER 1 GENERAL INFORMATIQN 3
If you are familiar with the basic concepts of the IEEE-488 bus you may want to
begin reading the Section 3. PROGRaI~MING REFERENCE. This section describes
the statement syntax and techniques to use the IEEE-488 driver in the firmware.
Section 4. PROGRAMMING TECHNIQUES will show you how the functions are
used in typical applications and also provide you with some useful program examples
for your own applications. All the examples are written in BASICA language.
If you want to know more details about this IEEE-488 interface card, please refer to
Section 5. ADVANCED PROGRAMMING TECHNIQUES. This section tells you
how to set DMA, how to modify transfer speed and how to use interrupts.
This manual is intended to be accurate and is organized to give you a quick reference
for programming ideas and the concepts of the IEEE-488 bus.

4PCL-848AB User's Manual
2. INSTALLATION
2.1. Inspection
When unpacking, check the unit for signs of shipping damage (damaged box, scratches,
dents, etc). If there is any damage to the unit or it fails to meet specifications, notify
your localt sales representative immediately. .
2.2. Switch and Jumper Setting
This IEEE-488 interface card has two DIP switch (SW1 and SW2), 1 one slide switch
(SW3) and three jumpers (JP1, JP2 and JP3). The: setting must be coincident with the
application program.
Legend:
CN1: GP-IB connector CN2: Digital output
connector
SW1: I/O port base address and wait states
SW2: Firmware base address SW3: Operation
mode (PCL-748 or NI PCÑI I )
JP1: DACK channel JP2: DRQ channel JP3:
IRQ level Fig. 2.2 . Location of switches and
jumpers
Fig. 2.2 Location of switches and jumpers

CHAPTER 2 INSTALLATION 5
2.2.1. I/O Base Address and Wait State Setting
The I/O ports base address and the number of wait states are selectable by the 8
position DIP switch SW1. The base address can be set anywhere in the I/O address
area from hex 200 to hex 3F8 and the wait states can be set to 0, 2, 4, or 6. Refer to
3 Fig. 2.2. for the locations of the DIP switches SW1. Factory settings of these
switches are hex 2B0 and zero wait state.
This multifunction interface card takes 16 addresses of I/O port following the base
address. The digital output port takes the addresses of BASE+0 and BASE+1 and the
IEEE-488 interface takes the addresses from BASE+8 to BASE+15. When using the
IEEE-488 driver routines, the IEEE-488 interface base address must be set to BASE+8
where the BASE is the set by DIP switch SW1. The default address of the IEEE-488
interface is then hex 2B8.
The switch settings for various base addresses and wait states are illustrated as below:
Note : - 0N = 0, 0FF = 1
-1..8 are switch positions
-W0..W1 correspond to wait state
-A4..A8 correspond to address lines of the PC bus
-* means factory setting
Switch position (SW1)
1 2 3 4 5 Occupied
A8 A7 A6 A5 A4 Addresses
--------------------------------------------------------------------
0 0 0 0 0 200-20F
0 0 0 0 1 210-21F
.
.
.
* 0 1 0 1 1 2B0-2BF
.
.
1 1 1 1 0 3E0-3EF
1 1 1 1 1 3F0-3FF
--------------------------------------------------------------------
Switch position (SW1)
7 8 Wait state(s)
W1 W0
------------------------------------------------
* 0 0 0
0 1 2
1 0 4
1 1 6
------------------------------------------------

6PCL-848AB User's Manual
2.2.2. Firmware Address Setting
The IBEE-488 interface driver routine is stored in the on-board i EPROM. The
memory address of this firmware can be selected by SW2. The memory segment of
the firmware can be from hex 8000 to s hex FC00. Factory setting is hex D000.
The range of these locations is out of the 640K system memory of i the IBM PC, PC/
XT and PC/AT. However, choice of this location must be made to avoid any conflict
with other interface cards. When two or more IEEE-488 interface cards are used in one
PC, the location settings must be different in order to have different working space
although the firmware code is the same.
The SW2 positions l to 5 determine the address bits Al8 to Al4. ~ Address bit A19 is
always 1. Address bits below A13 (included) are not cared.
Memory Location Segment SW2-1 SW2-2 SW2-3 SW2-4 SW 2-5
(hex) A18 Al7 A16 A15 A14
-----------------------------------------------------------------------------------------------------
8000 0 0 0 0 0
8400 0 0 0 0 1
8800 0 0 0 1 0
.
.
Reserved A000 0 1 0 0 0
.
.
CRT Display B000 0 l 1 0 0
.
.
Factory Setting D000 1 0 1 0 0
.
.
System ROM F000 1 1 1 0 0
FC00 1 1 1 1 1
---------------------------------------------------------------------------------------
* 0 : ON l : OFF
This multifunction IEEE-488 interface card takes 10K bytes of the memory space
including 8K byte RON and 2K byte RAM. The starting . address of the working
RAM is offset 8K bytes from the ROM starting address.

CHAPTER 2 INSTALLATION 7
2.2.3. Operating Mode Setting
SW3 is a slide switch to select the operating mode. When it is set to “A”, this card is
compatible with the easy-to-use PCL-748 IEEE-488 interface card except there is no
real time clock. When SW3 is set to “N”, this card becomes NI PC-II compatible. 3
It depends on the users which mode is selected. If the software package is already
developed for PC-II, then mode “N” can be used to eliminate the software effort.
Dowever, for new software developing, mode “A” is recommended to get all the
benefit of PCL-848A/B. PCL-848A/B does not support the software driver to use
mode “N” and this manual offers the information for mode “A” 3 operation only.
2.2.4. DMA Level Setting
The PCL-848A/B is designed to permit DMA (Direct Memory Access) = data
transfer between IEEE-488 bus and the system RAM of the PC. The DMA level is
set by JP1 and JP2. The JP1 is for DACK signal path while the JP2 is for DRQ. The
settings of JP1 and JP2 must be coincident. For example, if the JP1 is set to DACK 3,
then JP2 must be set to DRQ 3.
2.2.5. Interrupt Level (IRQ) Setting
The PCL-848A/B is designed to permit access to interrupt level 2 up to level 7 and
the interrupt is initiated by the NEC7210 GP-IB interface controller. The selection is
made by setting JP3.
Note: Although the IRQ level can be set from IRQ 2 to IRQ 7 _ on the
board, the firmware supports IRQ 2, 3, 5, and 7 only.
2.3. Installing the Card
2.3.1. Preparation
Discharge any static electricity by touching the back of the system unit before you
handle the board. You should avoid contact with materials that create static electricity
such as plastic, vinyl, and styrofoam.

8PCL-848AB User's Manual
The IEEE-488 interface card is setup at the factory of default setting:
Jumper/Switch Selection Default setting
SW1 1-5 I/O port base address Hex 2B0
SW1 7-8 Wait states 0
SW2 Firmware base address Hex D000
SW3 Operating mode A
JP1 DACK level 1
JP2 DRQ level 1
JP3 IRQ level 7
Refer to Section 2.2. for other configurations.
2.3.2. Installing the Card into a PC
The procedure to install the IEEE-488 interface card is as following:
1. Turn off the computer and any peripheral devices (such as printers and monitors).
2. Disconnect the power cord and any other cables from the back of the computer.
Turn the system unit so the back of the . unit faces you.
3. Remove the system unit cover (See your computer user’s guide if necessary).
4. Locate the expansion slots at the rear of the unit and =; choose any unused slot.
5. Remove the screw that secures the expansion slot cover to the system unit. (Save
the screw to secure the IEEE-488 interface card retaining bracket).
6. Carefully grasp the upper edge of the IEEE-488 interface 3 card. Align the hole in
the retaining bracket with the hole on top of the expansion slot, and align the gold
striped edge connector with the expansion slot socket. Press the board firmly into
the socket.
7. Replace the screw in the expansion slot retaining bracket.
8. Replace the system unit cover. Connect the cables you ~emoved in step 2.

CHAPTER 2 INSTALLATION 9
2.3.3. Function Check
Confirm proper operation by connecting an IEEE-488 instrument to i the bus and
attempting to operate it with a program written in BASIC.
Here is an example procedure using an HP3478A digital voltmeter s and a short
BASIC program.
1. Connect the HP3478A DVM to the IEEE-488 bus connector Of this card on the
back of the PC with a standard IEEE-488 s cable. On the PCL-848B, the connector
is 25 pin D type defined by IEC-625 and a PCL-15488-2 IEC-625 to IEEE-488
cable must be used.
2. Set the device address of the HP3478A DVM to 23.
3. Turn on the HP3478A DVM and the PC.
4. Get into BASICA or GWBASIC environment.
5. Key in the following BASIC statements:
10 DEF SEG=&BD000
20 OUTPUT%=3 : ENTER%=6
30 ADDR%=23 ‘GP-IB address of up3478A
40 TMP$=”F1" ~UP3478A DVM programming code
50 CALL OUTPUT%(ADDR%,TMP$)
60 FOR I=1 TO 10
70 D$=SPACE$(80)
80 CALL ENTER%(ADDR%,D$)
90 PRINT D$
100 NEXT I
110 END
6. Execute the program. It will display the 10 readings i measured by the HP3478A
DVM and thus confirm proper ~ operation.
If the system fails this test, check for these common problems:
1. The instrument requires a special terminator. Check the instruments instruction
manual and Section 3. of this manual.
2. The programming command syntax for the instrument may be incorrect. Check the
examples in the instrument manual.
3. Check all electrical connections.
If there is still any problem, contact your local sales representative for further
assistance.

10 PCL-848AB User's Manual
3. PROGRAMMING REFERENCE
3.1. Introduction
The PCL-848A/B interface card contains the resident firmware that provides IEEE-
488 language extensions for your PC. The firmware (software programmed into a read-
only-memory) appears transparent to the users and the function inside is called by the
IEEE-488 commands.
All of the routines in the firmware are written in assembly language to insure maxi-
mum data transfer rates. Each routine combines bus error checking. The routines also
check parameter values to insure that appropriate bus protocol is followed.
The routines in the firmware transfer commands and data on the IEEE-488 BUS
through the use of statements that are given English I language names like OUTPUT,
ENTER and INIT. Statement OUTPUT sends a data string to the IEEE-488 BUS in
much the same way as <PRINT “string”> sends data to the screen. Statement ENTER
looks ] for data coming from the IEEE-488 BUS, similar to the way <INPUT X$>
waits for a keyboard entry to assign to the string variable X$. Statement INIT clears
the interface and sets up specific operating modes on the interface card as the CLS
clears the screen and establishes specific operating conditions.
The data strings that you include in a SEND statement can be as general as the strings
you would use in a <PRINT> statement. The SEND function interprets IEEE-488
commands and data in any order that you choose. It also allows you to build powerful
commands that can be assigned to a single string variable that has a name and purpose
that is meaningful to you. The IEEE-488 BUS commands are separated by one or
more spaces. There is no difficult syntax to learn and only standard IEEE-488
mnemonics are used. The function of each mnemonic is performed exactly as defined
in the IEEE-488-1978 standard.
The firmware converts your command and data strings to specific control codes for
the IEEE-488 bus controller chip. It also passes back received data and interface status
conditions to your program. Received information may be used directly by your
program and the status codes (those returned by the STATUS function) may be used
to determine various interface operating conditions or to detect syntax errors in the
statements.
The next section discusses the CALL statement of BASICA and QuickBASIC. All of
the examples are given in BASICA, the syntax and use of each function is similar to
those of QuickBASIC version 2.0, 3.0 and 4.0.

CHAPTER 3 PROGRAMMING REFERENCE 11
3.2. Using the BASIC CALL Statement
The firmware routines on the IEEE-488 interface card, can be thought of as BASIC
language extensions. The extensions consist i of the statements ABORT, CLEAR,
ENTER, ENTERA, EOL, INIT, LLO, LOCAL, OUTPUT, OUTPUTA, PPOLL,
PPOLLC, PPOLLU, REMOTE, SEND, SPOLL, STATUS, TIMEOUT, TRIGGER
and ERRPTR. These routines allow ~ the PC to execute much faster because they are
written in assembly language. Another advantage is that the statement names only
represent address offsets and these offsets may be given any name that you prefer.
Calling the routines in the firmware when using BASICA requires three steps.
1. The location of the firmware routines must be defined using a DEF SEG statement.
This statement defines the current is egment address of the firmware and it is
determined by the setting of SW2. Since the factory setting is hex D000, as
statement as following is required.
DEF SEG = &HD000
Note: In most cases, the default setting of SW2 (hex D000) i is all right
for operation. Keep this setting unless another add-on card
occupies this memory space and cannot be changed.
2. The called routine must be located within the segment as defined by an offset
variables. For example, the OUTPUT routines has an offset of 3 and a statement to
define the offset variables is:
OUTPUT% = 3
Note: The OUTPUT% variabLe can be other variable names.
3. The parameters needed by this routine must be defined ~‘ according to the require-
ment of the application. Then, the s routine is executed by using a CALL statement.
The state ments are such as:
ADDR% = 23
D$ = “F1RA”
CALL OUTPUT%(ADDR%,D$)
Additional information on the DEF SEG and CALL statements is available in your
BASIC manual.

12 PCL-848AB User's Manual
Every called routine must define its entry address with an offset from the current
segment. For ease of reference all IEEE-488 routine offsets are at three byte incre-
ments and start at the top of the segment. For example, the INIT routine is at an
offset of 0 (zero), the OUTPUT routine is at an offset of 3, the ENTER routine is at
an offset of 6, and so on.
Please note that the program offsets must be entered exactly as shown for each
interpreter routine. The offsets determine where the program will branch and an
improper location can cause the PC to ignore all inputs except the power switch. This
is true of all BASIC CALL subroutines and is not a limitation of the interface board.
When you assign the offset, you are explicitly telling the CPU of the PC where to
look for its next instruction. Because it is running an assembly language routine, it
cannot check the validity, purpose, or use of each instruction the way it does as with
BASIC instructions. For that reason, it depends on receiving the proper offset address
and then assumes that the instructions are correct. The DEF SEG statement and all
offset address may be assigned with a single BASIC statement and never require
reassignment within your program. That means you can “set it and forget it” and get
on with the job of solving your program rather than being concerned about addressing
details.
Each routine also access the parameters those are received from or passed back to the
BASIC program. These parameters are shown in parentheses following the program
offset variable for each statement.
There are some limitations in BASICA that have, unfortunately, placed restrictions on
the called routines.
* The order, number, and type of variables passed to the routines must be exactly as
shown for each routine. This is because BASIC only passes pointers of variables
and does not provide a variable type identifier.
* The BASIC interpreter and compiler (such as Compiled BASIC and QuickBASIC)
have different string variable requirements. -t The default is for the BASIC
interpreter. For the BASIC compiler, you must call the INIT routine to set the
SETTING% bit 8 to be “1” to tell the firmware routines to handle the 3 parameters
in a different way.
* Passed parameters must be variables and cannot be constants.
* BASIC may change its source code if a statement changes the contents of the passed
string. This situation can be avoided by assigning a value to the string argument
before calling the firmware routines. The statement to define a blank string to
receive data is recommended is as:
D$ = SPACE$(255).

CHAPTER 3 PROGRAMMING REFERENCE 13
The programming examples and interpreter routines have been written to work around
these limitations and they should not placed any restrictions on your IEEE-488
applications.
3.3. Using QuickBASIC and BASIC Compiler
Calling the IEEE-488 routines in the firmware when using BASIC compiler or
QuickBASIC is almost the same way as using BASICA except the following two
areas.
1. When using the IEEE-488 routines in BASICA programming, the l; user does not
need to call the INIT routine (initialization) except the default setting is not used.
Uowever, the user need to call the INIT routine before calling any other IEEE488
routines when programming in BASIC compiler or QuickBASIC. When calling the
INIT routine, the bit 8 of the parameter SETTING% must be set to “1”.
2. The syntax to call the IEEE-488 firmware routines when programming in BASICA
is as:
CALL OUTPUT%(ADDR%,D$)
however, in BASIC compiler or QuickBASIC, the syntax is: lt
CALL ABSOLUTE(ADDR%, D$,0UTPUT%)
Note: When using QuickBASIC, the user needs to enter the develop-
ing environment by the command
QB/L
to load the library USERLIB.EXE. Otherwise, the word “ABSOLUTE” cannot be
recognized.
3.4. The Driver Routines
The following twenty one routines can be called by programs written in BASICA,
BASIC Compiler or QuickBASIC to access the IEEE-488 interface. QuickBASIC has
the same syntax as BASIC Compiler.

14 PCL-848AB User's Manual
3.4.1. AHORT
Purpose:
This command aborts all activities on the interface bus bys
Offset :
AHORT%=9
Syntax :
CALL AHORT% ---BASIC
CALL AHSOLUTE(AHORT%) ---BASIC Compiler
Parameter:
None.
Bus Activity :
IFC is pulsed for 100 microseconds.
REN is set true
ATN is set false.
Remark:
This command can be called only in system controller mode An error will occur if this
command is called in the nonsystem control mode.