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Runco VX-44d/-55d Installation/Operation Manual 87
PRE
L
IMINAR
Y
In addition to using the DHD Controller front-panel keypad or remote control unit, there
are two methods of controlling the VX-44d/-55d and DHD Controller externally:
• Using a serial (RS-232) link to send ASCII commands and receive responses to those
commands.
• Using discrete infrared (IR) codes to program a third-party remote control unit.
The following sections describe both of these methods.
6.1
Serial Communications
The DHD Controller uses a simple text-based control protocol to take requests from
control devices and to provide responses to such devices. This section describes how to
send control messages over a serial link between the DHD Controller and an
automation/control system or a PC running terminal emulation software.
RS-232 Connection and
Port Configuration
To interface the DHD Controller with an automation/control system or a PC running
terminal emulation software, connect it to your control system or PC as shown in
Figure
3-15.
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 DHD Controller
RS-232 port.
Serial Command SyntaxSerial commands to the DHD 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
50,16:9 <Enter> switches to
the Composite video input, sets the brightness to 50 and sets the aspect ratio to 16:9.
Command strings can be up to 255 characters long.
6. External Control
Avoid combining the ON or POWER 1 commands with other commands
on a single line. After sending ON or POWER 1, allow at least five (5)
seconds for the DHD
Controller to power up. If you have enabled the
ISF splash screen (refer to
Splash Configure on page 70), allow 15
seconds for the DHD Controller to power up.
Once it does, it will accept and properly execute multiple serial
commands.
Note