Technical appendix, 2 header, 3 command data – 3M MP8746 User Manual
Page 36
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
9
8
7
6
4
3
2
1
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
6
7
8
9
2 3
4
5
0
_
e
t
y
b
1
_
e
t
y
b
2
_
e
t
y
b
3
_
e
t
y
b
4
_
e
t
y
b
5
_
e
t
y
b
n
o
i
t
c
A
e
p
y
T
e
d
o
C
g
n
i
t
t
e
S
w
o
l
h
g
i
h
w
o
l
h
g
i
h
w
o
l
h
g
i
h
n
o
i
t
c
A
n
o
i
t
a
c
i
f
i
s
s
a
l
C
t
n
e
t
n
o
C
1
T
E
S
.
e
u
l
a
v
d
e
r
i
s
e
d
o
t
g
n
i
t
t
e
s
e
g
n
a
h
C
2
T
E
G
.
e
u
l
a
v
p
u
t
e
s
l
a
n
r
e
t
n
i
r
o
t
c
e
j
o
r
p
d
a
e
R
4
T
N
E
M
E
R
C
N
I
1
y
b
e
u
l
a
v
p
u
t
e
s
t
n
e
m
e
r
c
n
I
5
T
N
E
M
E
R
C
E
D
1
y
b
e
u
l
a
v
p
u
t
e
s
t
n
e
m
e
r
c
e
D
6
E
T
U
C
E
X
E
.
d
n
a
m
m
o
c
a
n
u
R