S
P
E
C
F
I
L
E
PT-
LB90NT
Portable LCD Projector
As of August 2009
< 7 >
STX
ETX
C1 C2 C3
:
P1 P2 P3 P4
Start
(1 byte)
End
(1 byte)
Colon
(1 byte)
Parameter
(1-4 bytes)
Command
(3 bytes)
(Control and/or query commands)
Serial connector
The serial connector complies with RS-232C. To control the projector from a personal computer, com-
mands must be input through communication software, based on the format and satisfying the commu-
nication conditions shown below.
Pin assignments and signal names
Communication conditions (factory setting)
Basic format
Transmission from the computer begins with STX, then the ID, command, parameter, and ETX are sent
in this order. Add parameters according to the details of control.
CAUTION
It may not be possible to send or receive commands for about 10 to 60 seconds when the lamp is first turned on. If this occurs, wait for 60 seconds, then
try sending or receiving again. When sending multiple commands, be sure to wait for at least 0.5 second after receiving a response from the projector
before sending the next command. Additional time is sometimes required for response due to processing inside the projector. Set the time-out period for
command response to 10 seconds or more.
NOTE:
If a wrong command is received, the projector will send an ER401 command to the computer.
When sending commands without parameters, a colon (:) is not necessary.
D-
s
ub HD 9-pin, female
6
1
5
9
No.
1
2
3
4
5
No.
6
7
8
9
S
ignal name
–
TXD
RXD
–
G
ND
S
ignal name
–
CT
S
RT
S
–
De
s
cription
NC
S
end data
Receive data
Connected internally
G
round
S
ignal name
NC
Connected internally
Connected internally
NC
S
ignal level
S
ynchronization method
Baud rate
Parity
Character length
S
top bit
X parameter
S
parameter
R
S
-232C-compliant
S
tart-
s
top
s
ynchronization
9,600 bp
s
None
8 bit
s
1 bit
None
None
Cable specifications
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
PC (DTE)
Projector
NC
NC
DSR
NC
NC
NC
NC
NC
