3M Multimedia Projector MP8749 Technisch handboek - Pagina 6
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T T
E E
C C
H H
N N
T T
E E
C C
H H
N N
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
Action
1
SET
2
GET
4
INCREMENT
5
DECREMENT
6
EXECUTE
TECHNICAL - 6
I I
C C
A A
L L
( (
c c
o o
I I
C C
A A
L L
( (
c c
!
&
$
%
Command data chart
byte_1
Action
low
high
Action (byte_0 - 1)
Classification
n n
t t
i i
n n
u u
e e
d d
o o
n n
t t
i i
n n
u u
e e
d d
Projector
Computer
1
2
3
4
5
6
SELO
7
RTS
8
9
GND
10
11
12
13
RD
14
TD
15
byte_2
byte_3
Type
low
high
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 jack
1
D-sub 9-pin
CD
2
RD
3
TD
2
1
4
DTR
5
GND
6
7
6
DSR
7
RTS
8
DTS
9
RI
byte_4
byte_5
Setting code
low
high
Content
3
4
5
9
8