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EXAMPLE #3:
The following example shows the events that occur when an invalid bar code
is sent. This sample will load the factory default settings and then set the
baud rate to 19200.
HOST
FEATURE
ASCII
COMMAND
SCANNER
REPRESENTATION
Enter Configuration Mode
RE
SPONSE
[stx]999999[etx] 02h 39h 39h 39h 39h 39h 39h 03h [ack] or 06h
Load Defaults [stx]99999:[etx] 02h 39h 39h 39h 39h 39h 3Ah 03h [nak] or 15h
Invalid command was sent, you must start over!
Enter Configuration Mode
[stx]999999[etx] 02h 39h 39h 39h 39h 39h 39h 03h [ack] or 06h
Load Defaults [stx]999998[etx] 02h 39h 39h 39h 39h 39h 39h 03h [ack] or 06h
19200 Baud Rate [stx]415870[etx] 02h 34h 31h 35h 38h 37h 30h 03h [ack] or 06h
Exit Configuration Mode [stx]999999[etx] 02h 39h 39h 39h 39h 39h 39h 03h [ack] or 06h
The scanner will beep three times!
This example illustrates two important points.
First, if an invalid command is sent from the host, the scanner responds with
a [nak] and the end-user must start over from the beginning.
Second, if a command is sent to change the Baud Rate, the new baud rate
does not take effect until after the end-user exits configuration mode.
ABBREVIATED ASCII TABLE
Character
Hex Value
Decimal Value
[STX]
02h
2
[ETX]
03h
3
[ACK]
06h
6
[NAK]
15h
21
0
30h
48
1
31h
49
2
32h
50
3
33h
51
4 34h 52
5
35h
53
6
36h
54
7 37h 55
8
38h
56
9
39h
57