RS-232 only

SYMPTOMS	POSSIBLE CAUSE(S)	SOLUTION

Power-up OK	Com port at the host not	Check to make sure the baud rate
	working or not configured	and parity of the scanner and the
Scans OK	properly	communication port match and the
		program is looking for “RS-232"
Does not	Cable not connected to the	data.
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	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

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$: IF K$ = “” THAN GOTO 110

32766 CLOSE: SYSTEM

32767 END