External Control
64
Vistage™ Series Flat-Panel Display Installation/Operation Manual
PRE
L
IMINAR
Y
6.2
Using Discrete IR
Codes
The DHD Controller accepts commands in the form of IR signals that conform to the
Phillips RC5 protocol. Each DHD Controller remote control button has an RC5 control
code associated with it.
You can use these codes to program a third-party, “universal” remote control unit to work
with the DHD Controller. These third-party products usually come with a computer
software application for this purpose. For more information, consult the documentation
provided with the remote control unit.
IR Command Protocol
The IR control codes have the following characteristics:
• Each code consists of 14 bits:
• Two (2)
s
tart bit
s
(always 1);
• A
toggle bit.
This bit is inverted every time a key is released and pressed again. This
allows the DHD Controller to distinguish between a button that remains down and
one that is pressed repeatedly.
• Five (5)
addre
ss
bit
s
. The default address is
17
(binary 10001). To change it, select
Remote Code from the Miscellaneous menu (in the Service menu) and follow the
steps given on page 53.
• Six (6)
data bit
s
.
• The carrier frequency is 36 kHz, with the modulated pulses having a 25% duty cycle.
• Commands are sent at a maximum rate of 9 Hz.
The following serial commands are meant to emulate buttons on the remote control. Each button
has its own serial command, so effectively it is as if you were using the IR remote only you’ll be
doing so via serial commands. These commands provide active OSD responses just like the IR
remote.
DOWN
NA
NA
Down-Arrow (
) key
ENTER
NA
NA
ENTER
key
EXIT
NA
NA
EXIT
key
LEFT
NA
NA
Left-Arrow (
) key
MENU
NA
NA
MENU
RIGHT
NA
NA
Right-Arrow (
) key
UP
NA
NA
Up-Arrow (
) key
Table 6-1.
S
erial Command
s
(continued)
Command
Parameter
(min/max)
Value
S
tored?
De
s
cription
➤
