Extended Function Codes (EFC)
Earlier universal remote controls used a device code/protocol number and three-digit extended function codes for programming via the remote itself, or through the JP1 interface. These sometimes enable a universal remote control to be programmed to use some extra functions which may not have been made available even on the original equipment manufacturer's remote control. In later controls, these function codes were extended to a length of five digits.
There is a tool which assists in the lookup of these code sets at the JP1 group site, and additional codes can also generally be obtained from the remote control manufacturer or supplier.
Read more about this topic: JP1 Remote
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