UHD654-X-HR LCD Panels Technical Reference
–
External Controls
020-001684-01 Rev. 1 (11-2019)
Copyright © 2019 Christie Digital Systems USA, Inc. All rights reserved.
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Using discrete IR codes
A display panel can accept commands in the form of infrared (IR) signals that conform to NEC.
Each button on a display panel remote control has an IR control code associated with it. You can use
these codes to program a third-party, universal, remote control unit that can work with the display
panel. Generally, these third-party products come with a computer software application that supports
this. For more information, see the documentation provided with the third-party remote control unit.
IR command protocol
The following are characteristics that IR control codes possess.
•
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 (custom code)
—
Eight bits for the address followed by the logical
inverse of the address. The custom code for the display is 16559 decimal (0x40AF, binary
01000000 10101111).
•
16 data bits
—
Eight 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.
To illustrate, below is the NEC control code for the POWER button on the display panel remote control
unit.
Hex
40
AF
1C
E3
Binary
010000000
10101111
00011100
11100011
Function
Cust. Code Byte 1
Cust. Code Byte 2
Command
Command (logical
inverse)
IR control code list
Learn the IR control codes.
Customer code
Data code
Function
40AF
04FB
INFO
40AF
1CE3
POWER
40AF
08F7
DISPLAY PORT1
