Sony VPL-FE100U Protocol Manual page 9

5 Data Size
B16 Data Length 3
Note : Error when 80 to FF hex codes are included.
Calculate the actual 6 Data length using the following method.
Calculate the Total Data Length using the B15 (*1) and B16 Data.
<Example>
If B15 = 02 h and B16 = 7 Fh, calculate the Total Data Size as follows.
Data Length indicated by B15.
2 * 128 = 256 Byte
Data Length indicated by B16.
127 Byte
The Data Length indicated by Total is ;
(B15) 256 Byte + B (16) 127 Byte = 383 Byte.
6 Data
Bn~Bm Data
Bn = B (16 + 1)
Bm = B (16 + Total Data Length)
7 Check SUM
B (m + 1) Check Sum
XOR is the exclusive OR.
It is as follows when calculated by 1 bit.
Taking A XOR B = C ;
A B C
0 0 0
1 0 1
0 1 1
1 1 0
<Example of Calculation>
When 0XA5 (165) and 0XA5 (165) are calculated by XOR ;
A5 10100101
A5 10100101
Answer 00000000
When 0XA5 (165) and 0X5A (90) are calculated by XOR ;
Answer
A5 10100101
5A 01011010
Answer 11111111
8 End Condition
B (m + 2) END Code
VPL-FE100U/FE100E/FE100M
Size of 6
00 – 7F
XX Indicates the last packet
Checksum of Data from 2 to 6
XX
(Calculate the XOR of the Data from 2 to 6.)
(165)
(165)
(0)
(165)
(90)
(255)
5A No Data in some cases
5