Connection; Communication Procedure; Outline Of Communication - Sony VPL-VW70 Protocol Manual

2-4. 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.
D-Sub 9 Pin D-Sub 25 Pin
Shell = FG 1
3 2
2 3
7 4
8 5
6 6
5 7
1 8
4 20
9 22
Pins indicated as D-Sub 25 Pin are not used.
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 recep-
tion for only the TxD and RxD lines.
Therefore there is no handshake normally performed by RS-232C.

2-5. Communication Procedure

2-5-1. 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 CON-
TROLLER 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 sends
the command until the return data is returned differs according to the contents of the command.
n
When Sircs Direct Command is sent, return data may not be returned in some cases.
4
FG Grounding for safety protection or cable shield
TxD Transmission data
RxD Reception data
RTS Transmission request
CTS Transmission permission
DSR Data set ready
SG GND for signal
DCD Data channel signal carrier detection
DTR Data terminal ready
RI Calling display (Presence/absence of calling signal)
Name
VPL-VW70