Rockwell-automation 2708-NBD VBASIC Language Development Kit Instrukcja Użytkownika Strona 39
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Chapter 5
A-B VBASIC Application Library
5–2
Installation consists of installing the diskette in drive A: and typing:
A:
INSTALIB d:
Where d is the destination drive.
You must first set up Visual BASIC, see Microsoft manual “Learning to Use
Microsoft Visual BASIC” for installation procedures (manual is provided
with the software). Also, make sure that the commands VB and LXBC are
available from the installed directory “ \ LIB”.
The A-B VBASIC compiler requires that all of your program reside in a
single file. (It does not support a LINK step which would combine multiple
independent object files into a single run file.) Since the BASIC Language
Development Kit is made up of multiple files, the normal way to use it is to
append all of the desired modules together and then load the resultant file
under Visual BASIC or compile it with the A-B VBASIC Compiler.
The only required module of the library when testing on the PC is
ENVPC.BAS.
Suppose you have the following program:
DEFINT A–Z ’ Recommend default variable type
OpenLINX ’ REQUIRED library initialization
TIMEOUT% = 1000 ’ Set a 10 second timeout
DO
CLD
PRINT “Library Test”
PRINT “Do something” ; ’ 2nd line MUST have; or scrolls
e = ReadEvent% (2) ’ The mask (the 2) means read
SELECT CASE e ’ from keyboard/bdg with timeout.
CASE TimeoutEvent ’ The 10 seconds expired so make
CLS: PRINT “ *Timeout* ”’ this obvious.
BEEP : SLEEP 2
CASE BadgeEvent : CLS ’ The event that occurred was a
PRINT “Badge read”’ Bar code badge.
PRINT InBuf$; ’ The badge contents is in InBuf$
BEEP : SLEEP 2 ’ Make some noise, and show badge.
CASE ELSE : CLS ’ Case Else required in LinxBASIC!!
PRINT “Key = ” ;e; ’ Display ASCII code for the key
SLEEP 2 ’ or negative code if its special.
END SELECT
LOOP ’ Do this test forever
Using the Library
- User Manual 1
- Important User Information 2
- Chapter 1 3
- Chapter 2 3
- Chapter 3 3
- Special Devices 4
- Chapter 5 5
- Appendix B 5
- Bulletin 2708 6
- Table of Contents 6
- Application Library 7
- Subroutines 7
- A-B VBASIC Limits 8
- Introduction to BASIC 9
- What is Visual BASIC ? 10
- What is A-B VBASIC? 11
- Developing and Running 12
- The A-B VBASIC 13
- Development Procedure 13
- (cont’d) 13
- Loading and Auto-Starting 14
- Start-up Condition of 14
- Termination of an 15
- A-B VBASIC Program 15
- A-B VBASIC 16
- Run-Time Errors 16
- Power Failure 17
- CROSS-COMPILER (LXB) 18
- Invoking the Compiler 19
- Special Devices in A-B VBASIC 22
- Introduction (cont’d) 23
- Device: LCD Display 23
- Device: Keypad 24
- Device: Barcode Scanners 25
- Device: Host Computer 27
- Chapter 4 30
- IF LOC(#1) 0 THEN 31
- LINE INPUT #1, INLINE$ 31
- ‘ Do something else 31
- Devices: Communication 32
- Ports, Primary and 32
- Auxiliary 32
- Auxiliary (cont’d) 33
- Device: RAM Files 34
- Device: RAM Files (cont’d) 35
- Device: Beeper 35
- Device: Front Panel LEDs 35
- Device: The #9 36
- User Status Display 36
- Device: The Egg Timer 37
- Introduction 38
- Using the Library 39
- Using the Library (cont’d) 40
- Writing Programs 40
- Using the ENVPC Simulator 41
- Appendix 47
- Appendix A 48
- Differences Between 49
- A-B VBASIC and Visual BASIC 49
- Supported A-B VBASIC 50
- Keywords 50
- CLOSE #1 51
- EOF(filenumber) 54
- GOTO {linelabel/linenumber} 57
- HEX$(expression) 57
- IF...THEN...ELSE 57
- INT(numeric–expression) 58
- IOCTL$([#]filenumber) 58
- IOCTL[#]filenumber,string 58
- KILL “filespec” 58
- LOF(filenumber) 60
- LTRIM$(stringexpression) 60
- MKD$, MKI$, MKL$, MKS$ 60
- RANDOMIZE expression 62
- REM remark 62
- ‘ remark 62
- SGN(numeric–expression) 64
- SLEEP seconds 64
- SOUND frequency,duration 64
- SWAP vari1,vari2 66
- TIME$ = stringexpression 66
- OpenLINX 70
- SUB OpenLINX 70
- Appendix C 71
- Appendix D 81
- A-B BASIC Limits 81
- ALLEN-BRADLEY 84
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