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7 PROGRAM EXAMPLES
Chapter 7 PROGRAM EXAMPLES
Examples of application programs for an IBM PC are shown below.
Environment
Computer used: IBM PC
Mode:
Character length = 8 bits, parity = none, stop bit = 1, baud rate =
1200 bps
Handshake:
None
The file name used for writing to and reading from the floppy disk is TEST.DAT.
7.1 Program to Read Parameter Settings from VR200, Display Them
on Screen and Write Them to Disk
100
‘************************************************************
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‘** RS422A Example Program for IBM PC **
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‘** **
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‘** To input and save parameter settings **
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‘** **
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‘************************************************************
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‘**
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‘** Baud rate: 1200 Stop bit: 1 bit
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‘** Parity: none Control: OFF/OFF
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‘** Data length: 8 bits
Others: LF is sent automatically.
200
‘**
210
‘
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OPEN “COM1:1200,N,8,1,LF” AS #1
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OPEN “TEST.DAT” FOR OUTPUT AS #2
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‘
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LF$=CHR$(&HA)
:’ Line feed = 0AH
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PRINT #1,CHR$(27)+”O 01"
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PRINT #1,”TS1"
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PRINT #1,CHR$(27)+”T”;
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PRINT #1,”LF01,04"
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LINE INPUT #1,D$
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IF LEFT$(D$,1)=LF$ THEN D$=MID$(D$,2) :’ Remove “LF” of head string
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PRINT D$
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PRINT #2,D$
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IF LEFT$(D$,2)<>”EN” THEN GOTO 300
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‘
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PRINT #1,CHR$(27)+”C 01"
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CLOSE
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END
7.1 Program to Read Parameter Setting from VR200, Display Them on Screen and Write Them to Disk
