Rs-232C Communication - Hitachi CPX380W Service Manual

PJ750-2
CP-X380W

13. RS-232C Communication

(1) Turn off the projector and computer power supplies and connect with 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
19,200bps, 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 fl ag for command data.
CRC_high : Upper byte of CRC fl ag for command data.
3 Command data
Action
1
2
4
5
6
51
Projector
Control jack
5 4 3 2 1
SELO
10 9 8 7 6
13 12
15 14 11
GND
Command data chart
byte_0 byte_1
Action
low high
Classification
SET
GET
INCREMENT
DECREMENT
EXECUTE
RS-232C jack
Computer
D-sub 9-pin
1
1 CD
2
RD
2
3 TD
3
1
4 4 DTR
5
5 GND
6
6 DSR
7
RTS 7 RTS
8 DTS
8
9 9 RI
10
11
12
13
RD
TD 14
15
byte_2 byte_3 byte_4
Type Setting code
low high low
Action (byte_0 - 1)
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
2 3 4 5
6 7 8 9
byte_5
high
Content