Specifications

Remote Control and Receiver-Transceiver Specifications and Requirements
for Windows Media Center in Windows Operating Systems
103
Description
This is the response used to indicate whether something is plugged into a specific transmit port.
In the Microsoft-produced IR device, this was done by measuring voltage drop across the port.
By measuring volts-at-rest and volts-when-driven, the software could differentiate between IR
emitters and S-Link devices. For emulation devices, IR emitters are the only option. As a result,
physically measuring the presence of a plug in the jack is sufficient.