Filter
Top Products
Using Discrete IR Codes
82 Planar UltraRes User Manual
Using Discrete IR Codes
The UltraRes display accepts commands in the form of IR signals that conform to the
NEC protocol. Each UltraRes remote control has an NEC control code associated with
it. You can use these codes to program a third-party “universal” remote control to
work with the UltraRes. 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.
IR Command Protocol
The 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 1784 (0x06F9, binary 00000110
11111001)
• 16 data bits: eight (8) bits for the command followed by the logical inverse of
the command
• 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, below is the NEC control code for the ON button of the UltraRes remote
control (assuming the default address is used).
The following example shows the pulse train for this command.
Hex 06 F9 01 FE
Binary
00000110 11111001 00000001 11111110
Function Address Byte 1 Address Byte 2 Command
Command (Logical
Inverse)
Leader Pulse
00000 0119 ms 4.5 ms
Address Byte 1 Address Byte 2 Command Byte Command Byte (logical inverse)
00 0000000 011111 1 11111111
End Pulse
13.5 ms 27 ms 27 ms