Metrologic Instruments MS7220 manual RS232 Demonstration Program

RS232 DEMONSTRATION PROGRAM

If an RS232 scanner is not communicating with your IBM compatible PC, key in the following BASIC program to test that the communication port and scanner are working. This program is for demonstration purposes only. It is only intended to prove that cabling is correct, the com port is working, and the scanner is working. If the bar code data displays on the screen while using this program, it only demonstrates that the hardware interface and scanner are working. At this point, investigate whether the application software and the scanner configuration match. If the application does not support RS-232 scanners, a software wedge program that will take RS-232 data and place it into a keyboard buffer may be needed. This program tells the PC to ignore RTS-CTS, Data Set Ready (DSR) and Data Carrier Detect (DCD) signals. If the demonstration program works and yours still does not, jumper RTS to CTS and Data Terminal Reading (DTR) to DCD and DSR on the back of your PC.

10 CLS

20 ON ERROR GOTO 100

30OPEN “COM1:9600,S,7,1,CS0,DS0,CD0,LF” AS #1

35PRINT “SCAN A FEW BAR CODES”

40LINE INPUT #1, BARCODE$

50PRINT BARCODE$

60K$ = INKEY$: IF K$ = CHR$(27) THEN GOTO 32766

70GOTO 40

100PRINT “ERROR NO.”; ERR; “ PRESS ANY KEY TO TERMINATE.”

110K$ = INKEY$: IF K$ = “” THEN GOTO 110

32766 CLOSE: SYSTEM

32767 END

27