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7 PROGRAM EXAMPLES
7.3 Program to Read Unit and Decimal Point Information from VR200,
Display It on Screen, and Write It to Disk
100 ‘**********************************************************
110 ‘** RS422A Example Program for IBM PC **
120 ‘** **
130 ‘** To input and save point and unit information **
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$(27)+”O 01"
270 PRINT #1,”TS2"
280 PRINT #1,CHR$(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 MID$(D$,2,1)<>”E” THEN GOTO 300
350 ‘
360 PRINT #1,CHR$(27)+”C 01"
370 CLOSE
380 END
7.3 Program to Read Unit and Decimal point Information from VR200, Display It on Screen, and Write It to Disk