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3M
™
Personal Projector MP8746/MP8747
36
© 3M IPC 2000
Technical Appendix
RS-232 Communication
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
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.
5
10
15 14 13 12 11
9876
4321
CONTROL Terminal
D-sub 15-pin shrink jack
1
2
3
4
5
6
1
2
3
4
7
8
9
10
11
12
13
14
15
Projector Computer
SELO
RTS
GND
TD
RD
CD
RD
TD
DTR
5
6
7
8
GND
DSR
RTS
DTS
9
RI
RS-232C jack
D-sub 9-pin
1
6789
2345
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