Hitachi CP-WX625 - WXGA LCD Projector Technical Manual

10. RS-232C communication
1 2 3 4 5
6
7 8 9
CONTROL port
of the projector
Connecting the cable
Turn off the projector and the computer.
1.
Connect the CONTROL port of the projector with a RS-232C port of
2.
the computer by a RS-232C cable (cross). Use the cable that fulfills the
specification shown in the previous page.
Turn the computer on, and after the computer has started up turn the
3.
projector on.

Communications setting

19200bps, 8N1
1. Protocol
Consist of header (7 bytes) + command data (6 bytes).
2. Header
BE + EF + 03 + 06 + 00 + CRC_low + CRC_high
CRC_low : Lower byte of CRC flag for command data
CRC_high : Upper byte of CRC flag for command data
3. Command data
Command data chart
byte_0 byte_1
Action
low high
Action (byte_0 - 1)
Action Classification
1 SET
2 GET
4 INCREMENT
5 DECREMENT
6 EXECUTE
CPWX625(ED3WX40N)
RS-232C cable (Cross)
- (1)
RD (2)
TD (3)
- (4)
GND (5)
- (6)
RTS (7)
CTS (8)
- (9)
byte_2 byte_3
Type
low high
Content
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
61
(1) CD
(2) RD
(3) TD
(4) DTR
(5) GND
(6) DSR
(7) RTS
(8) DTS
(9) RI
byte_4 byte_5
Setting code
low high
1 2 3 4 5
6
7 8 9
RS-232C port
of the computer