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Using Discrete IR Codes

Planar UltraRes User Manual 98

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 1785 (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)

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 135 136

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