DIRECTV D10 Installation Guide - Page 37

DIRECTV Set-Top Box Information for the Installer 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. DIRECTV, Inc. Version 2.2 Page 37 of 42 March 5, 2008 DTV-MD-0058