Metrologic Hand-Held Scanner Guide de l'utilisateur télécharger pdf (Page 33)

TROUBLESHOOTING GUIDE (CONTINUED)

RS-232 only

SYMPTOMS POSSIBLE CAUSE(S) SOLUTION

Power-up OK

Scans OK

Does not

communicate

properly to the host

Com port at the host not

working or not configured

properly

Cable not connected to

the proper com port

Com port not operating

properly

Check to make sure the baud

rate and parity of the scanner

and the communication port

match and the program is

looking for “RS-232" data.

NOTE: Metrologic’s default of 7 data bits, space parity is usually what is expected

when an IBM compatible type PC is configured for 8 data bits, no parity.

SYMPTOMS SOLUTION

Host receiving data but data does

not look correct

Check that the scanner and host are

configured for the same interface format

Characters are being dropped

Add some intercharacter delay to the

transmitted output. This can be

programmed into the scanner through

ScanSelect

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$: IF K$ = “” THAN GOTO 110

32766 CLOSE: SYSTEM

32767 END

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Metrologic Hand-Held Scanner Guide de l'utilisateur Page 33

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