Metrologic MS6720 Installation And User Manual page 29

RS-232 only
SYMPTOMS POSSIBLE CAUSE(S)
Power-up OK Com port at the host not
working or not configured
Scans OK properly
Does not Cable not connected to the
communicate proper com port
properly to the
host Com port not operating
properly
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
Host receiving data but data does not
look correct
Characters are being dropped
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
26
SOLUTION
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.
SOLUTION
Check that the scanner and host are
configured for the same interface format
Add some intercharacter delay to the
transmitted output. This can be programmed
into the scanner through ScanSelect