Metrologic Instruments IS6520 - Manual (Page 22)

15
P ROGRAMMING M ODES ( CONTINUED )
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 SCANNER
FEATURE COMMAND ASCII REPRESENTATION RESPONSE
Enter Program Mode [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 Program 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 Program Mode [stx]999999[etx] 02h 39h 39h 39h 39h 39h 39h 03h [ack] or 06h
The scanner will emit a long beep!
This example illustrates 2 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 program mode.
ABREVIATED 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