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Hitachi PJ-LC5 Manual

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5
RS-232C Communication
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
Connecting The Cable
Communications Setting
(1)
Turn off the projector and the computer power supplies.
(2) Connect the CONTROL port of the projector with a RS-232C port of the computer by a RS-
232C cable. Use the cable that fulfills the specification shown in the following figure.
(3) Turn on the computer power supply and after the computer has started up, turn on the
projector power supply.
byte_0 byte_1 byte_2 byte_3 byte_4 byte_5
Action Type Setting code
low high low high low high
Action (byte_0 - 1)
Action Classification Content
1 SET Change setting to desired value.
2 GET Read projector internal setup value.
4 INCREMENT Increment setup value by 1.
5 DECREMENT Decrement setup value by 1.
6 EXECUTE Run a command.
CONTROL
port
D-sub 9-pin
plug
RS-232C port
D-sub 9-pin
plug
D-sub 9-pin
jack
D-sub 9-pin
jack
1
2
3
4
5
6
7
8
9
RD
TD
GND
CTS
RTS
1
2
3
4
5
6
7
8
9
CD
RD
TD
DTR
GND
DSR
RTS
DTS
RI
Projector RS-232C cross cable Computer
6789
54321
9876
12345
6789
54321
9876
12345
⇔⇔
… 48 …


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