JVC ProVerite PS-420W Owner's Manual page 51

HDMI Consumer Electronics Control
HDMI CEC
MENU function (INFORMATION)
Vendor Specific Data.
a
OPCODE
command Command
With ID
Read Set ID
Ack Read Set ID
Read F/W
Version
Ack Read F/W
Version
HDMI CEC CheckSum
OPCODE
Vendor
command Command
With ID
Set Power
We can make CheckSum with Vendor Specific Data.
For example:
(0x01) XOR (0x00) XOR (0xA0) XOR (0x00) XOR (0x00) = 0xA1
VENDOR ID
Vendor
VENDOR ID
(3bytes)
0xA0 0x3C 0xE6
0x24
0xA0 0x3C 0xE6
0x24
0xA0 0x3C 0xE6
0x24
0xA0 0x3C 0xE6
0x24
VENDOR ID
VENDOR ID
(3bytes)
0xA0 0x3C 0xE6
0x24
(Set ID) XOR (Payload Type) XOR (Command) XOR (Data #0) XOR (Data #1) = CheckSum
Payload (fixed bytes : 3 bytes)
Header (2 bytes)
Set
Payload Type Command
ID
1
5
1
5
Vendor Specific Data
Payload (fixed bytes : 3 bytes)
Header (2 bytes)
Set Payload
Command
ID Type
0 0x10
A21
Vendor Specific Data
data #0 data #1
0x90 reserved reserved
(0x00)
0x90 0xE0 : OK
0xE1 : NG
0x91 reserved reserved
(0x00)
0x91 F/WLeft part F/WRight
data #0 data #1
0 : 0ff reserved
1 : On (0x00)
Checksum
(1byte)
CS #0
Header XOR
(0x00) Payload
1~100 Header XOR
Payload
Header XOR
(0x00) Payload
Header XOR
part Payload
Checksum
(1byte)
CS #0
Header XOR
Payload