InFocus LP840 Communications Manual

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.
Control jack
D-sub 15-pin shrink jack
5
15
Communications setting
19200bps, 8N1
1 Protocol
Consists 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 SET
2 GET
4 INCREMENT
5 DECREMENT
6 EXECUTE
LP840/LP850
Projector
3 2 1
4
10 9 8 7 6
14 13 12 11
Command data chart
byte_0 byte_1 byte_2
Action
low high low
Action (byte_0 - 1)
Classification
Computer
1 1
CD
2 2
RD
3 3
TD
4 4
DTR
5 5
GND
6
SELO 6
DSR
RTS 7 7
RTS
8
8 DTS
9 9
RI
GND
10
11
12
RD 13
TD 14
15
RS-232C adapter
byte_3 byte_4
Type Setting code
high low
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
1
RS-232C jack
D-sub 9-pin
1 2 3 4 5
6 7 8 9
byte_5
high
Content