DIRECTV Set-Top Box Information for the Installer
DIRECTV, Inc.
March 5, 2008
Version 2.2
Page 37 of 42
DTV-MD-0058
7 Wired IR Input Port
7.1 Introduction
Some DIRECTV set top box models support a wired IR input port. This port permits third party
infrared control devices to issue remote control commands to the DIRECTV set top box via a wired
interface. This section describes the interface specifications for the wired IR input port
7.2 Interface Specifications
The wired IR input port is designed to accept a 3.5mm stereo plug. The stereo plug must be wired as
indicated in Figure 7-1.
Figure 7-1 Wired IR Input Plug
The DIRECTV set-top box’s DATA IN line expects an IR blaster-style signal. The IR signal must be
a positive logic IR waveform with a 38kHz carrier (also known as “modulated IR”). The DATA IN
line is +3.3V and +5V tolerant.
The DIRECTV set-top box’s +5V OUT line can source up to 100mA of current for powering external
third party devices. This power is provided out of the DIRECTV set top box. This line may be left
unterminated in the stereo plug if external power or voltage sensing by third party devices is not
required.
