Specifications

Remote Control and Receiver-Transceiver Specifications and Requirements
for Windows Media Center in Windows Operating Systems
84
bRequest = 0x01 – bMS_VendorCode
wValue = 0x0000 -
wIndex = 0x0004 – INDEX_CONFIG_DESCRIPTOR
wLength = 16 – Length of the request
After the header is retrieved (and if it matches the format of the header section), the operating
system will issue a second request to read the entire Extended Compat ID Descriptor.
The Extended Compat ID Descriptor is an array of bytes containing the fields shown in the
following table.
Field
Length
(bytes)
Value
Description
dwLength
4
0x28 0x00 0x00
0x00
Length of the descriptor
bcdVersion
2
0x00 0x01
Version of the
descriptor
wIndex
2
0x04 0x00
Fixed:
INDEX_CONFIG_
DESCRIPTOR
bCount
1
0x01
Count of device
functions—must be 1
Reserved
7
0x00 0x00 0x00
0x00 0x00 0x00
0x00
Reserved
bFirstInterfaceNu
mber
1
0x00
First interface for this
function
Reserved
1
0x01
Reserved
compatibleID
8
"USBCIR\0\0"
-or-
0x55 0x53 0x42
0x43 0x49 0x52
0x00 0x00
Compatible ID, padded
with zeros
subcompatibleID
8
"IR2CMPT\0"
-or-
0x49 0x52 0x32
0x43 0x4D 0x50
0x54 0x00
Sub-compatible ID,
padded with zeros
Reserved
6
0x00 0x00 0x00
0x00 0x00 0x00
Reserved