Specifications

External Control
Runco LS-10d and LS-10HBd Installation/Operation Manual 95
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6.2
Using Discrete IR
Codes
The DHD Controller accepts commands in the form of IR signals that conform to the NEC
protocol. Each DHD Controller remote control button has an NEC 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 ProtocolThe IR control codes have the following characteristics:
• Each code consists of the following:
•A leader pulse (a modulated pulse of 9 ms followed by a non-modulated pulse of
4.5 ms);
•16 address bits. The default address is 82 09 (0x2011, binary
00100000 00010001). To change it, select Remote Code from the Miscellaneous
menu (in the Service menu) and follow the steps given on page 75;
•16 data bits: eight (8) bits for the command followed by the logical inverse of the
command; and
•An end pulse (a modulated pulse of 0.56 ms, similar to the modulated pulse in the
‘0’ and ‘1’ bits).The end of the modulated pulse constitutes the end of the data
transmission.
• The carrier frequency is 38 kHz, with the modulated pulses having a 33% duty cycle.
• Commands are sent at a maximum rate of 9 Hz.
For example, here is the NEC control code for the ON button on the DHD Controller
remote control unit (assuming the default address is used):
Figure 6-1 shows the pulse train for this command.
Figure 6-1. NEC Protocol Message Format
Hex201101FE
Binary 00100000 00010001 00000001 11111110
Function Address Byte 1 Address Byte 2 Command
Command
(Logical Inverse)
9 ms
13.5 ms 27 ms
27 ms
Address Byte 1Leader Pulse Address Byte 2 Command Byte Command Byte (logical inverse)
001 000000001 0001 00000001 1 1 1 1 1 1 1 0
4.5 ms
End Pulse