Metrologic Instruments MS9500 manual Abbreviated Ascii Table

Programming Modes (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 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 program 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

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