Sony VPL-PX20 / VPL-PX30 / VPL-VW10HT Service Manual ▷ View online
6
VPL-PX20/PX30
VPL-VW10HT
5. Connection
<RS-232C Connection>
Communication is enabled by the use of a D-Sub 9 Pin cross (reverse) cable.
The pin assignment of D-Sub 9 Pin and D-Sub 25 Pin is as follows.
Pins indicated as D-Sub 25 Pin are not used.
Assured cable length: 15 m (However, assurance may not be applicable for some cables.)
Assured cable length: 15 m (However, assurance may not be applicable for some cables.)
The software for controlling the projector from a PC is intended for performing transmission and
reception for only the TxD and RxD lines.
Therefore there is no handshake normally performed by RS-232C.
Therefore there is no handshake normally performed by RS-232C.
D-Sub 9 Pin
Shell = FG
3
2
7
8
6
5
1
4
9
D-Sub 25 Pin
1
2
3
4
5
6
7
8
20
22
Name
FG
TxD
RxD
RTS
CTS
DSR
SG
DCD
DTR
RI
Grounding for safety protection or cable shield
Transmission data
Reception data
Transmission request
Transmission permission
Data set ready
GND for signal
Data channel signal carrier detection
Data terminal ready
Calling display (Presence/absence of calling signal)
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VPL-PX20/PX30
VPL-VW10HT
6. Communication Procedure
6-1. Outline of Communication
All communication between CONTROLLER (PC, etc.) and DEVICE (PROJECTOR) is performed by the
command block format. Communication is started by the issue of a command at CONTROLLER and
ended when the return data is sent to CONTROLLER after DEVICE receives the command.
CONTROLLER is prohibited from sending several commands at one time. This means that after
CONTROLLER sends one command, it cannot send other commands until DEVICE returns the return
data. DEVICE sends the return data after processing the command. The time from when CONTROLLER
data. DEVICE sends the return data after processing the command. The time from when CONTROLLER
sends the command until the return data is returned differs according to the contents of the command.
In some cases, CONTROLLER may receive data from DEVICE even though it has not sent a command.
(For example, during SYS setting, SIRCS command, and switcher information when switcher is selected.)
Note: When Sircs Direct Command (CMD1 = 17 hex) is sent, return data may not be returned in
some cases.
6-2. Reading the Command Tables
The command tables can be found in Section 9 (page 11).
CMD1 indicates the command category. The ACK from the projector is returned attached with the
CMD1 indicates the command category. The ACK from the projector is returned attached with the
command category sent from the controller. However, when errors of the communication line occur, 10
hex (COMMON) will be returned.
CMD2 indicates the command processing method and processing results. 00 hex (SET) is set when
setting data from the controller to the projector or when requesting for data processing. 01 hex (GET) is
set when acquiring data. 2 hex (RETURN) is set when returning the ACK of the command received from
the projector to the controller and when attaching data. 03 hex (ACK) is set when returning only the
the projector to the controller and when attaching data. 03 hex (ACK) is set when returning only the
processing results.
However, F0 hex (COMM NAK) is set when the command the projector receives from the controller has
a communication line error or checksum inconsistency.
The top of each category indicates the meaning of the data.
The top of each category indicates the meaning of the data.
8
VPL-PX20/PX30
VPL-VW10HT
7. Communication Rules
. When sending a command from CONTROLLER, the return data (CMD1 = 10 hex or CMD1 = each
category value, CMD2 = 03 hex) from PROJECTOR should be received first before sending the next
command. Even if the next command is sent before receiving the return data, since PROJECTOR will
command. Even if the next command is sent before receiving the return data, since PROJECTOR will
not be able to receive that command, it does not return a response to CONTROLLER. Consequently, no
error code is also sent.
The following lists the approximate waiting times for PROJECTOR to return the return data after
CONTROLLER sends the command.
. When a communication error occurs, PROJECTOR ignores the data received until now, and set into the
reception standby state.
. For undefined commands or commends determined as invalid by PROJECTOR, PROJECTOR will
send the “NAK” return data to CONTROLLER .
. Take note that when data is written when the input signal of PROJECTOR is unstable, that data (value)
will not be incorporated.
. When INDEX specified SIRCS direct command (CMD1 = 17 hex) is transmitted, leave an interval of
45 mSec until the next transmission. (Do not return the return data (ACK, NAK) when the SIRCS
direct command is received.)
9
VPL-PX20/PX30
VPL-VW10HT
8. Approximate Return Waiting Times
Note: The times shown in this table are when communication is performed in the condition that it
will not be interrupted by some reason.
CMD1
00
00
01
01
01
03
03
CMD2
00
01
01
00
01
00
00
DATA1
_
_
_
00
00
00
00
01
DATA2
_
_
_
01, 02
05
05
_
_
_
TIME (mSec)
20
20
20
20
20
25
20
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