Hitachi 42EDT41A, Service Manual

Page: 18 / 89

18
PW1A
Plasma TV
4. Command String Development Information
4.1- To assist with developing command strings, the table below shows a Hex character
conversion chart
Table 4.1.1 Hex Character Conversion Chart
4.2 - An example of the proper coding technique is demonstrated below for the “Power On”
Command.
Hex Character Set: 6E: Power Function
00: Write Function (Note- A “01” would indicate a read function)
00: 3
rd
(Upper byte-Function)
00: 4
th
(Lower byte-Function)
00: 5
th
(Upper byte-Data)
01: 6
th
(Lower byte- Data
Hex Coded Data: 364530303030303030303031
Note- an STX (02-Hex) would be added at the start of the string and ETX (03-Hex) would be
added at the end of the string to create a complete command.
4.3- Figure 6 shows the 14 byte string formatted in Hex Characters for the “Power On Function”.
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Start Stop
02 6 E 0 0 0 0 0 0 0 0 0 1
Figure 6
4.4- Figure 7 shows the “Power On” function converted to Hex Code set
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Start Stop
02 36 45 30 30 30 30 30 30 30 30 30 31
Hex Character Hex Code
0 30
1 31
2 32
3 33
4 34
5 35
6 36
7 37
8 38
9 39
Hex Character Hex Code
A 41
B 42
C 43
D 44
E 45
F 46
Function
(2 Byte)
Function
(2 Byte)
Figure 6
Read/Write
(2 Byte)
Function (2 Byte)
Upper Data
(2 Byte)
Function (2 Byte)
Lower Data
(2 Byte)
Function (2 Byte)
STX
(1 Byte) ETX
(1 Byte)
Function
(2 Byte)
Function
(2 Byte)
Read/Write
(2 Byte)
Function (2 Byte)
Upper Data
(2 Byte)
Function (2 Byte)
Lower Data
(2 Byte)
Function (2 Byte)
STX
(1 Byte)
ETX
(1 Byte)
Function
(2 Byte)
Figure 6
Function
(2 Byte)
Figure 6