Communications Setting - Hitachi CPX885 - XGA LCD Projector Technical Manual

RS-232C COMMUNICATION
(1) Turn off the projector and computer power supplies, and connect with the RS-232C
adapter via the RS-232C cable.
(2) Turn on the computer power supply and after the computer has started up, turn on the
projector power supply.
Control jack
D-sub 15-pin shrink jack

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
byte_0
low
Action
1 SET
2 GET
4 INCREMENT
5 DECREMENT
6 EXECUTE
Projector
SELO
RS-232C adapter
Command data chart
byte_1 byte_2
Action
high low
Action (byte_0 - 1)
Classification
Computer
1 1
CD
2 2 RD
3 3
TD
4 4 DTR
5 5
GND
6 6
DSR
RTS 7 7
RTS
8 8 DTS
9 9
RI
GND
10
11
12
13
RD
TD 14
15
byte_3 byte_4
Type
high
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
RS-232C jack
D-sub 9-pin
2 3 4 5
1
9
6 7 8
byte_5
Setting code
low high
Content
5