Hitachi CP-X880W User Manual page 49

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.
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
Action
1
2
4
5
6
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Control jack
byte_0 byte_1
Action
low high
Action (byte_0 - 1)
Classification
SET
GET
INCREMENT
DECREMENT
EXECUTE
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Projector Computer
1
2
3
4
5
SELO 6
RTS 7
8
9
GND 10
11
12
13
RD
TD 14
15
RS-232C adapter
Command data chart
byte_2 byte_3
Type
low 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
1
CD
2
RD
3
TD
1 2 3 4
4
DTR
5 GND
6 7 8
6
DSR
7
RTS
8 DTS
9
RI
byte_4 byte_5
Setting code
low high
Content
5
9
5