Infocus LP840 Specification Guide
LP840/LP850
1
RS-232 communication
(1) Turn off the projector and computer
. Connect the RS-232C adapter via the RS-232C cable.
(2) Turn on the computer
. Once the computer has started up, turn on the projector.
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15
Control jack
D-sub 15-pin shrink jack
Projector Computer
Communications setting
19200bps, 8N1
19200bps, 8N1
1 Protocol
Consist
Consist
s 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.
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
Command data chart
byte_0
byte_1
Action
low
high
byte_2
byte_3
Type
low
high
byte_4
byte_5
Setting code
low
high
Action
Classification
Content
Action (byte_0 - 1)
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.
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9
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15
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15
RD
TD
GND
SELO
RTS
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9
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9
CD
RD
RD
TD
DTR
DTR
GND
DSR
RTS
DTS
RTS
DTS
RI
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9
RS-232C jack
D-sub 9-pin
RS-232C adapter