Metrologic MS6720 User's Guide download pdf (Page 30)

RS-232 only

SYMPTOMS POSSIBLE CAUSE(S) SOLUTION

Power-up OK Com port at the host not Check to make sure the baud rate

Scans OK properly communication port match and the

Does not Cable not connected to the data.

communicate proper com port

properly to the

host Com port not operating

working or not configured and parity of the scanner and the

properly

program is looking for “RS-232"

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 Check that the scanner and host are

look correct 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 comx port is working, and the scanner is working. If the bar code data

displays on the screen while using this program, it only demon-strates that the hardware

interface and scanner are working. At this point, investigate whether the application

software and the scanner configuration match. If the applica-tion 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 demostration 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 MS6720 User's Guide Page 30

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