3M Multimedia Projector S40 Руководство по эксплуатации - Страница 5
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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.
control jack
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
byte_0
low
Action
1
SET
2
GET
4
INCREMENT
5
DECREMENT
6
EXECUTE
4
All manuals and user guides at all-guides.com
Projector
SELO
RTS
GND
RD
TD
Command data chart
byte_1
byte_2
Action
high
low
Action (byte_0 - 1)
Classification
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
Computer
1
1
CD
2
2
RD
3
3
TD
4
4
DTR
5
5
GND
6
6
DSR
7
7
RTS
8
8
DTS
9
9
RI
10
11
12
13
14
15
byte_3
byte_4
Type
Setting code
high
low
Content
RS-232C jack
D-sub 9-pin
2
3
4
5
1
6
7
8
9
byte_5
high