Vivid VTS-4600, Руководство по эксплуатации

Страница: 59 / 75

46
6.2 Using Discrete IR Codes
The display accepts comm ands in the form of infrared (IR) signals that conform to the NEC protocol. Each
display remote control button has an IR control c ode associated with it.
You can use these c odes to program a third-party,
“universal” remote control unit to work with the display.
These third-party products usually come with a computer software application for this purpose. For more
information, consult the docum entation provided with the remote control unit.
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 (also called a “custom c ode”): eight (8) bits for the address followed by the logic al
inverse of the address. The custom code for the display is 16559 decim al (0x40AF, binary 01000000
10101111).
• 16 da ta bits: eight (8) bits for the command followed by the logic al 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 cod e for the POWER button on the display remote control unit:
Hex 40 AF 1C E3
Binary 01000000 10101111 00011100 11100011
Function Cust. Code Byte 1 Cust. Code Byte 2 Command
Command
(Logical Inverse)