Metrologic Instruments MS7120 Series User Manual

Page 31

RS-232 Demonstration Program

If an RS-232 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
30 OPEN “COM1:9600,S,7,1,CS0,DS0,CD0,LF” AS #1
35 PRINT “SCAN A FEW BAR CODES”
40 LINE INPUT #1, BARCODE$
50 PRINT BARCODE$
60 K$ = INKEY$: IF K$ = CHR$(27) THEN GOTO 32766
70 GOTO 40
100 PRINT “ERROR NO.”; ERR; “ PRESS ANY KEY TO TERMINATE.”
110 K$ = INKEY$: IF K$ = “” THEN GOTO 110
32766 CLOSE: SYSTEM
32767 END