Specifications

Remote Control and Receiver-Transceiver Specifications and Requirements
for Windows Media Center in Windows Operating Systems
90
Message direction: Host to device
Offset
Name
Value
Description
0
CMD_PORT_IR
0x9F
IR command
1
CMD_SETIRTIMEO
UT
0x0C
Command ID - set IR time-out
2
TOH
Number
High byte of time-out value
3
TOL
Number
Low byte of time-out value
Description
This command sets the IR time-out. This is the period of silence necessary before the firmware
will determine that a signal has ended and will stop sending silence to the host.
TOH and TOL are the high and low bytes of the time-out period as a count of IR sample periods.
Response
Description
RSP_EQIRTIMEOUT
Successfully changed the IR time-out period.
No errors are returned to the host for this command.
CMD_SETIRTXPORTS – Set IR Transmit Ports
Message ID: CMD_SETIRTXPORTS
Message length: 3 bytes
Message direction: Host to device
Offset
Name
Value
Description
0
CMD_PORT_IR
0x9F
IR command
1
CMD_SETIRTXPOR
TS
0x08
Command ID - set IR transmit
ports
2
P
Number
Bitmask of ports to set
Description
This command sets the ports that will be used for IR transmissions. The bits of P represent the 8
IR ports, IR0 being the LSB, IR7 the MSB. A "1" bit indicates that the port will be used. This
command is generally used before each IR transmission to specify which ports it will go to. The
IR emulator device will not send a response to verify this command.
No response is returned to the host for this command.
No errors are returned to the host for this command.