3M Multimedia Projector MP8749 Basic Technical Manual - Page 6
Browse online or download pdf Basic Technical Manual for Projector 3M Multimedia Projector MP8749. 3M Multimedia Projector MP8749 12 pages. Multimedia projector
Also for 3M Multimedia Projector MP8749: Quick Start Manual (5 pages), Information Sheet (2 pages), Technical Manual (12 pages)
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T T
E E
C C
H H
N N
I I
C C
T T
E E
C C
H H
N N
I I
C C
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
Classification
1
SET
2
GET
4
INCREMENT
5
DECREMENT
6
EXECUTE
TECHNICAL - 6
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A A
L L
( (
c c
o o
n n
t t
i i
A A
L L
( (
c c
o o
n n
t t
i i
Projector
1
2
3
4
5
6
SELO
$
%
RTS
7
8
9
10
GND
11
12
13
RD
TD
14
15
Command data chart
byte_1
byte_2
Action
Type
high
low
Action (byte_0 - 1)
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
n n
u u
e e
d d
) )
n n
u u
e e
d d
) )
Computer
1
CD
2
RD
3
TD
4
DTR
5
GND
6
DSR
7
RTS
8
DTS
9
RI
byte_3
byte_4
Setting code
high
low
Content
RS-232C jack
D-sub 9-pin
1
2
3
4
5
6
7
8
9
byte_5
high