JVC ProVerite PS-420W Owner's Manual page 41

RS-232C
Prefix code Prefix code
command
#0
Ack Set 0xCC
Factory
Reset
MENU function (INFORMATION)
Protocol (data format).
a
Prefix code Prefix code
command
#0
Read Set 0xCC
ID
Ack Read 0xCC
Set ID
Read F/W 0xCC
Version
Ack Read 0xCC
F/W
Version
RS232C CheckSum
Prefix code Prefix code
command
#0
Set Power 0xCC
We can make CheckSum with Header (5 bytes) and Payload(4 bytes).
(Prefix code#0) XOR (Prefix code#1) XOR (Set ID) XOR (Command Payload Type) XOR
(# of Payload bytes) XOR (Command) XOR (data #0) XOR (data #1) XOR (data#2) =
CheckSum
For example:
(0xCC) XOR (0x33) XOR (0x01 = Set ID) XOR (0x00) XOR (0x04) XOR (0x10) XOR (0x01 =
ON) XOR (0x00) XOR (0x00) = 0xEB
Controlling the Multiple Product
Header (5 bytes)
Set Payload
#1 ID Type
0x55 0
Header (5 bytes)
Set Payload
#1 ID Type
0x33 1
0x55 1
0x33 1
0x55 1
Header (5 bytes)
Set Payload
#1 ID Type
0x33 0
Payload (4 bytes)
# of payload
Command
bytes
4 0x79 0xE0 : OK
0xE1 : NG
Payload (4 bytes)
# of payload
Command
bytes
4 0x90
4 0x90 0xE0 : OK
0xE1 : NG
4 0x91
4 0x91 0xE0 : OK
0xE1 : NG
Payload (4 bytes)
# of payload
Command
bytes
4 0x10
A11
data #0 data #1 data #2
reserved reserved
(0xFF) (0xFF)
data #0 data #1 data #2
reserved reserved reserved
(0x00) (0x00) (0x00)
1~100 reserved
(0xFF)
reserved reserved reserved
(0x00) (0x00) (0x00)
F/WLeft F/W Right
part part
data #0 data #1 data #2
0 : 0ff reserved reserved
1 : On (0x00) (0x00)
Checksum
(1byte)
CS #0
Header XOR
Payload
Checksum
(1byte)
CS #0
Header XOR
Payload
Header XOR
Payload
Header XOR
Payload
Header XOR
Payload
Checksum
(1byte)
CS #0
Header XOR
Payload