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3M™ Digital Projector X76
RS-232C Communication
1
2
3
4
5
6
7
8
9
CONTROL port
of the projector
Connecting the cable
Turn off the projector and the computer.
1.
Connect the CONTROL port of the projector with a RS-232C port of
2.
Turn the computer on, and after the computer has started up turn the
3.
projector on.
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
3. Command data
Command data chart
byte_0
byte_1
Action
low
high
Action (byte_0 - 1)
Action
1
Set
2
Get
4
Increment
5
Decrement
6
Execute
© 3M 2008. All Rights Reserved.
RS-232C cable (cross)
- (1)
RD (2)
TD (3)
- (4)
GND (5)
- (6)
RTS (7)
CTS (8)
- (9)
byte_2
byte_3
Type
low
high
Content
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
RS-232C Communication
(1) CD
(2) RD
(3) TD
(4) DTR
(5) GND
(6) DSR
(7) RTS
(8) DTS
(9) RI
byte_4
byte_5
Setting code
low
high
1
2
3
4
5
6
7
8
9
RS-232C port
of the computer
7