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Vision Model 140/150 Installation/Operation Manual 91
PRE
L
IMINAR
Y
6.1
RS-232 Connection and
Port Configuration
To interface the VHD Controller with a home theater automation/control system or a PC
running terminal emulation software, connect it to your control system or PC as shown in
Figure 3-14.
Configure the RS-232 controller or PC serial port as follows: no parity, 8 data bits, 1 stop bit
and no flow control. Set the baud rate to 19200, to match that of the VHD Controller RS-232
port.
6.2
Serial Command Syntax
Serial commands to the VHD Controller take the following form:
• Commands are not case-sensitive.
• For a single command that takes no parameters, type the command followed by a
carriage return; for example, to set the aspect ratio to Letterbox, type
LETTERBOX
<Enter>.
• For a single command that takes a parameter, type the command, a space or a comma
and the desired value followed by a carriage return; for example, to set the brightness to
-10, type BRIGHTNESS
-10 <Enter> or BRIGHTNESS,-10 <Enter>.
• You can also send a string of multiple commands on a single line, separated by commas.
For example, COMPOSITE,BRIGHTNESS
100,ANAMORPHIC <Enter> switches to
the Composite video input, sets the brightness to 100 and sets the aspect ratio to
Anamorphic. Command strings can be up to 255 characters long.
Table 6-1 lists the RS-232 command set. The “Parameter (min/max)” column shows the valid
parameter ranges, or “NA” for commands that take no parameters.
When you enter a valid command, the VHD Controller executes it and acknowledges it with a
plus sign on the command line (+ >). When you enter an invalid command – one that is
misspelled or followed by values outside the valid range for that command – the VHD
Controller ignores it and returns a minus sign (- >).
6Serial Communications
Avoid combining the ON or POWER 1 commands with other commands on a
single line. After sending ON or POWER 1, allow at least 15 seconds for the
VHD
Controller to power up. Once it does, it will accept and properly execute
multiple serial commands.
Table 6-1. Serial Commands
Command
Parameter
(min/max)
Value
Stored?
Description
Power On/Off Commands
OFF NA NA Turns projector off
ON NA NA Turns projector on
POWER 0/1 NA Turns projector on and off
POWER? NA NA Returns power status
Note