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HDS4x2 User Guide, Rev 1.1, 08-31-07
IR Jack, IR Format and IR Codes
IR format
The default IR codes used by the HDS4x2 are 32 bits long, based on the NEC transmission protocol and use a
carrier frequency of 38KHz.
Typical IR Code. Example Code = 807D08F7 (hex):
108 mS 108 mS
8 0 7 D 0 8 F 7
Stop Bit
Leader Data Bits
Repeat Code
A magnied view of the Leader and rst three data bits:
9 mS 4.5 mS 2.25 mS
1 Bit 0 Bit
1.125 mS
0.56 mS
A magnied view of the Repeat Code (sent when key is held down):
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