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What is an Infra Red "Device Code"?

What is an IR device code? (I am reading a manual for an IR blaster).

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So in the case of TV, each TV manufacturer (Sony, Sanyo,etc) uses different IR protocols to respond remote control commands such as "channel up" ?

Is that the idea?

Reply to
mr_ravi_patil
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Correct. You wouldn't want to change channels on your TV whenever you toggle your cable box or VCR now would you?? :-)

Reply to
Frank Olson

That would not be good. But it would be simpler if all TV manufacturers folowed the same IR command for "channel up", etc.

The only problem I could see with that is if you have 2 different brands of TV and wanna change the channel on just one.

Reply to
mr_ravi_patil

You are conflating two separate concepts.

There are a limited (although quite large) number of IR protocols which is the overall scheme for transmitting the information. Then, within each protocol, there are the individual codes the manufacturers assign to each device and then to each function.

One of the oldest protocols was developed by NEC and it is in use by many different manufacturers. You can find the details of the NEC protocol in this datasheet (the site appears to be down right now).

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It's designed to incorporate a manufaturer's ID (assigned by NEC and called a "custom" code) and a function code. In this way many manufacturers could use the same protocol without interfering with each other. X-10 even uses the NEC protocol to send RF with its handheld remotes.

Here's a l>

Reply to
Dave Houston

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