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External Control
6.2
Using Discrete IR
Codes
IR Command Protocol
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.
➤
The IR control codes have the following characteristics:
• Each code consists of 14 bits:
• Two (2) start bits (always 1);
• A toggle bit. This bit is inverted every time a key is released and pressed again. This
enables the DHD Controller to distinguish between a button that remains down and
one that is pressed repeatedly.
• Five (5) address bits. The default address is 17 (binary 10001). To change it, select
Remote Control from the Service menu and follow the steps given on page 67.
• Six (6) data bits.
• 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.
For example, here is the RC5 control code for the ON button on the DHD Controller
remote control unit (assuming the default address is used):
Hex
3
Binary
1
1
Hex
3
Binary
1
1
Start
Function
Bits
With Toggle Bit = 0
4
0
1
0
0
With Toggle Bit = 1
C
1
1
0
0
Toggle
Address
Bit
78
4
0
1
0
0
0
4
0
1
0
0
0
Command
Q-750d Series Installation/Operation Manual
1
0
0
1
1
0
0
1
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