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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 ‘************************************************************
110 ‘** RS422A Example Program for IBM PC **
120 ‘** **
130 ‘** To input and save parameter settings **
140 ‘** **
150 ‘************************************************************
160 ‘**
170 ‘** Baud rate: 1200 Stop bit: 1 bit
180 ‘** Parity: none Control: OFF/OFF
190 ‘**
Data length: 8 bits
Others: LF is sent automatically.
200 ‘**
210 ‘
220 OPEN “COM1:1200,N,8,1,LF” AS #1
230 OPEN “TEST.DAT” FOR OUTPUT AS #2
240 ‘
250 LF$=CHR$(&HA) :’ Line feed = 0AH
260 PRINT #1,CHR$(27)+”O 01"
270 PRINT #1,”TS1"
280 PRINT #1,CHR$(27)+”T”;
290 PRINT #1,”LF01,04"
300 LINE INPUT #1,D$
310
IF LEFT$(D$,1)=LF$ THEN D$=MID$(D$,2) :’ Remove “LF” of head string
320 PRINT D$
330 PRINT #2,D$
340 IF LEFT$(D$,2)<>”EN” THEN GOTO 300
350 ‘
360 PRINT #1,CHR$(27)+”C 01"
370 CLOSE
380 END
7.1 Program to Read Parameter Setting from VR200, Display Them on Screen and Write Them to Disk