Check Sum, Examples of check sum applications

RS-232C Adjustment

7Check Sum

This is data to which 2-Byte ASCII code is added to a data group returned by a QUEST command.

PC side

STX	ID	QUEST command	ETX
02 (hex)	2 Byte	3 Byte	03 (hex)

Set side

STX	QUEST command	Data	Check sum	ETX
02 (hex)	3 Byte	*Byte	2 Byte	03 (hex)

A detailed example is given below.

Example) The check sum value that is added when the QUEST command “QAA” returned the following 6-Byte data string.

Data group (ASCII)	QUEST command	Data (6 Byte)	Check sum
+ check sum	QAA	100128	xx (before calculation)
	QAA	100128	xx (before calculation)

The data group is put into binary code one character at a time then displayed (only the last two digits are displayed).

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47	41	41	31	30	30	31	32	38

When these values are added the result is 1F5 (hex).

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xx, where xx is 0B (hex), is added to 1F5 so the last two digits are 00 (in this case 200).

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As the data format, OB is converted to ASCII code and sent.

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The following data is output from the Plasma Display side.

STX	QUEST command	Data	Check sum	ETX
02 (hex)	QAA	100128	0B	03 (hex)

*The returned data group is in capital letters. Please keep this in mind when introducing it into the binary display.

7Examples of check sum applications

Example 1) When the data is missing 1 Byte

STX	QUEST command					Data			Check sum	ETX
02 (hex)		QAA			100 (missing data) 28				0B	03 (hex)
		47	41	31	30	30	32	38
		47	41	31	30	30	32	38

The data group is calculated according to rules by a PC application, and when these values are added the result is 1C4 (hex).

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A value xx, where xx is 3C (hex), is added to 1C4 such that the last two digits are 00 (in this case 200).

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Here, the check sum [OB (hex)] and the calculated [3C (hex)] do not match.

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Since they do not match, the PC application sends the QUEST command again and gets the data again.

Example 2) When 1 Byte of data in the data is unreadable

STX	QUEST command					Data				Check sum	ETX
02 (hex)		QAA				100328				0B	03 (hex)
		47	41	31	30	33	30	32	38

The data group is calculated according to rules by a PC application, and when these values are added the result is 1F7 (hex).

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A value xx, where xx is 09 (hex), is added to 1F7 such that the last two digits are 00 (in this case 200).

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Here, the check sum [OB (hex)] and the calculated [09 (hex)] do not match.

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282	Since they do not match, the PC application sends the QUEST command
	again and gets the data again.

PDP 427CMX specifications

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Pioneer PDP 427CMX technical manual Check Sum, Examples of check sum applications

Models: PDP 427CMX