Hitachi LP-WU6600 User Manual page 85

1. Protocol
19200bps,8N1
2. Command format
("h" shows hexadecimal)
Byte Number
Command
Action
<SET> Change setting to
desired value [(cL)(cH)]
by [(bL)(bH)].
<GET> Read projector
internal setup value [(bL)
(bH)] .
<INCREMENT>
Increment setup value
[(bL)(bH)] by 1.
<DECREMENT>
Decrement setup value
[(bL)(bH)] by 1.
<EXECUTE> Run a
command [(bL)(bH)] .
[Header code] [Packet] [Data size]
Set [BEh, EFh, 03h, 06h, 00h] to byte number 0~4.
[CRC flag]
For byte number 5, 6, refer to RS-232 Communication command table.
[Action]
Set functional code to byte number 7, 8.
<SET> = [01h, 00h], <GET> = [02h, 00h], <INCREMENT> =[04h, 00h]
<DECREMENT> = [05h, 00h], <EXECUTE> = [06h, 00h]
Refer to RS232 Communication command table
[Type] [Setting code]
For byte number 9~12 , , refer to RS-232 Communication command table.
3. Response code / Error code
("h" shows hexadecimal)
1. ACK reply: 06h
When the projector receives the Set, Increment, Decrement or Execute , command correctly, the
projector changes the setting data for the specified , item by [Type], and it returns the code.
2. NAK reply: 15h
When the projector cannot understand the received command, the projector , returns the error
code. In such a case, check the sending code and send the same command again.
3. Error reply: 1Ch + 0000h
When the projector cannot execute the received command for any reasons, the projector returns
the error code. In such a case, check the sending code and the setting status of the projector.
0 1 2 3
Header
Header Data
code size
Packet
L H L
BEh EFh 03h 06h 00h
Communication settings
4 5 6 7 8
CRC
Action
flag
H L H L H
(aL) (aH) 01h 00h (bL) (bH) (cL) (cH)
(aL) (aH) 02h 00h (bL) (bH) 00h 00h
(aL) (aH) 04h 00h (bL) (bH) 00h 00h
(aL) (aH) 05h 00h (bL) (bH) 00h 00h
(aL) (aH) 06h 00h (bL) (bH) 00h 00h
9 10 11 12
Data
Setting
Type
code
L H L H
85