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PT-
TW231R
Short-Throw LCD Projector
As of June 2012
SFL12M002-2
9 / 1 2
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.
Basic format
Transmission from the computer begins with STX, then command, parameter, and ETX are sent in this
order. Add parameters according to the details of control.
Communication conditions (factory setting)
Pin assignments and signal names
6
1
5
9
D-sub 9-pin (male)
Serial input
Description
NC
Receive data
Send data
NC
Ground
Signal name
–
RXD
TXD
–
GND
No.
1
2
3
4
5
Description
NC
NC
NC
NC
Signal name
–
–
–
–
No.
6
7
8
9
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 sec-
onds, 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.
Start
(1 byte)
End
(1 byte)
Colon
(1 byte)
Parameters
(undefined length)
Command
(3 bytes)
STX
ETX
C1
P1 P2 ... Pn
C2 C3
:
Signal level
Synchronization method
Baud rate
Parity
RS-232C-compliant
Start-stop synchronization
19,200 bps
None
NOTE: When sending commands without parameters, a colon (:) is not necessary.
Basic format with sub-commands
Same as the basic format without sub-commands
Parameters (6 bytes):
“+” or “-” sign (1 byte) with setting/adjusting value (5 bytes)
Sub-command
(5 bytes)
Operation (1 byte):
“=” (Sets the value designated by the parameters)
S1
P1 P2 P3 P4 P5 P6
S2 S3 S4 S5
E
STX
ETX
C1 C2 C3
:
Character length
Stop bit
X parameter
S parameter
8 bits
1 bit
None
None
NOTE: When sending sub-commands that require no parameters, operation (E) and parameters are not necessary.
