Pioneer PureVision PDP-427CMX Reference Manual - Page 22
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RS-232C Adjustment
7 Check 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
02 (hex)
2 Byte
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)
+ check sum
The data group is put into binary code one
character at a time then displayed (only the
last two digits are displayed).
* The returned data group is in capital letters. Please keep this in mind when introducing it into the binary
display.
7 Examples of check sum applications
Example 1) When the data is missing 1 Byte
STX
02 (hex)
The data group is calculated according to rules by a PC application,
and when these values are added the result is 1C4 (hex).
A value xx, where xx is 3C (hex), is added to 1C4 such that the last
two digits are 00 (in this case 200).
Here, the check sum [OB (hex)] and the calculated [3C (hex)] do not match.
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
02 (hex)
The data group is calculated according to rules by a PC application,
and when these values are added the result is 1F7 (hex).
A value xx, where xx is 09 (hex), is added to 1F7 such that the last
two digits are 00 (in this case 200).
Here, the check sum [OB (hex)] and the calculated [09 (hex)] do not match.
Since they do not match, the PC application sends the QUEST command
22
again and gets the data again.
ETX
3 Byte
03 (hex)
Set side
STX
02 (hex)
QUEST command
QAA
47
41
When these values are added the result is 1F5 (hex).
xx, where xx is 0B (hex), is added to 1F5 so the last two digits are 00 (in this case 200).
As the data format, OB is converted to ASCII code and sent.
The following data is output from the Plasma Display side.
STX
QUEST command
02 (hex)
QUEST command
Data
QAA
100 (missing data) 28
47
41
31 30 30 32 38
≠
≠
≠
QUEST command
Data
QAA
100328
47
41
31 30 33 30 32 38
≠
≠
≠
QUEST command
3 Byte
Data (6 Byte)
100128
≠
41
31
30
30
31
32 38
≠
≠
≠
Data
QAA
100128
Check sum
0B
03 (hex)
Check sum
0B
03 (hex)
Data
Check sum
*Byte
2 Byte
Check sum
xx (before calculation)
Check sum
ETX
0B
03 (hex)
ETX
ETX
ETX
03 (hex)