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How do universal IR remote “codes†work
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up vote
2
down vote
favorite
It is easy to find this kind of reference when searching for IR protocols and codes for specific equipment. The actual IR transmission contains far more data than these small codes can hold.
What exactly those codes represent?
How can 4 digits represent all the commands a device can receive?
Are these "codes" references to some standard protocol?
How do the universal remote knows the protocol and all the codes the product understands from this small configuration code?
I would love to understand more about this technology. For me it seems that every remote is different, and you would have to reverse engineer every message to identify which bit/byte does what.
infrared remote-control protocol
edited 2 hours ago
Passerby
55.2k448143
asked 2 hours ago
Filipe Nicoli
42338
add a comment |Â
up vote
2
down vote
favorite
It is easy to find this kind of reference when searching for IR protocols and codes for specific equipment. The actual IR transmission contains far more data than these small codes can hold.
What exactly those codes represent?
How can 4 digits represent all the commands a device can receive?
Are these "codes" references to some standard protocol?
How do the universal remote knows the protocol and all the codes the product understands from this small configuration code?
I would love to understand more about this technology. For me it seems that every remote is different, and you would have to reverse engineer every message to identify which bit/byte does what.
infrared remote-control protocol
edited 2 hours ago
Passerby
55.2k448143
asked 2 hours ago
Filipe Nicoli
42338
Thank you @Passerby
– Filipe Nicoli
1 hour ago
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
It is easy to find this kind of reference when searching for IR protocols and codes for specific equipment. The actual IR transmission contains far more data than these small codes can hold.
What exactly those codes represent?
How can 4 digits represent all the commands a device can receive?
Are these "codes" references to some standard protocol?
How do the universal remote knows the protocol and all the codes the product understands from this small configuration code?
I would love to understand more about this technology. For me it seems that every remote is different, and you would have to reverse engineer every message to identify which bit/byte does what.
infrared remote-control protocol
edited 2 hours ago
Passerby
55.2k448143
asked 2 hours ago
Filipe Nicoli
42338
It is easy to find this kind of reference when searching for IR protocols and codes for specific equipment. The actual IR transmission contains far more data than these small codes can hold.
What exactly those codes represent?
How can 4 digits represent all the commands a device can receive?
Are these "codes" references to some standard protocol?
How do the universal remote knows the protocol and all the codes the product understands from this small configuration code?
I would love to understand more about this technology. For me it seems that every remote is different, and you would have to reverse engineer every message to identify which bit/byte does what.
infrared remote-control protocol
infrared remote-control protocol
edited 2 hours ago
Passerby
55.2k448143
asked 2 hours ago
Filipe Nicoli
42338
edited 2 hours ago
Passerby
55.2k448143
asked 2 hours ago
Filipe Nicoli
42338
edited 2 hours ago
Passerby
55.2k448143
edited 2 hours ago
Passerby
55.2k448143
edited 2 hours ago
Passerby
55.2k448143
55.2k448143
asked 2 hours ago
Filipe Nicoli
42338
asked 2 hours ago
Filipe Nicoli
42338
asked 2 hours ago
Filipe Nicoli
42338
42338
Thank you @Passerby
– Filipe Nicoli
1 hour ago
add a comment |Â
Thank you @Passerby
– Filipe Nicoli
1 hour ago
Thank you @Passerby
– Filipe Nicoli
1 hour ago
Thank you @Passerby
– Filipe Nicoli
1 hour ago
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
2
down vote
accepted
The codes are just a reference to a set of actual IR codes. It tells the microcontroller or CPU (loose term) of the remote which type of code modulation, brand and device type to use. The standard protocols are RC5 and NEC, though there are other types. Once you know the protocol, the rest is just crafting the actual button code, which is a fairly small set of generic codes, typically 8 bits so 0 to 255 or 0x00 to 0xFF, and a manufacturer code. Each value does different things based on the device, so one tv may take 0x0A to mean power on, another might use that for channel down.
Universal remotes work basically by the manufacturer gathering as much data about common IR code sets for common devices and providing the end user with a way to set that code set. The codes you put in are just like a street address, with the remote figuring out all the information it needs for that code.
TV manufacturers sometimes reuse codes from one tv to another, and some white label manufacturers reuse them (white label manufacturers make generic TVs with a store name brand). So there's a lot of overlap in codes. No one likes to reinvent the wheel.
edited 1 hour ago
Niteesh Shanbog
16418
answered 1 hour ago
Passerby
55.2k448143
So the codes on the table I've referenced are far more related to the universal remote than to the devices themselves?
– Filipe Nicoli
1 hour ago
Yes. They are basically arbitrary numbers for the order that the remote company added new code sets.
– Passerby
1 hour ago
I understand. Are you aware of any online source for these code sets?
– Filipe Nicoli
1 hour ago
YES! getzweb.net/jp1 has a huge list for multiple remote types. I use it with my Comcast remote that's really a universal remote made by UEI. Typically seen with the JP1 connector. You can google your remote type to find more. Some can be programmed with custom codes. For example, my tv code set includes codes for my android tv box and my Mac!
– Passerby
38 mins ago
add a comment |Â
up vote
1
down vote
All the code does is tell the transmitting device what it's talking to. The specific commands would already be known by the transmitting device for each model.
As for how the remote knows the commands for each model, it would have to be programmed into the remote, so they would be defined and released by the manufacturer or reverse engineered.
answered 2 hours ago
thomashw
1462
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
The codes are just a reference to a set of actual IR codes. It tells the microcontroller or CPU (loose term) of the remote which type of code modulation, brand and device type to use. The standard protocols are RC5 and NEC, though there are other types. Once you know the protocol, the rest is just crafting the actual button code, which is a fairly small set of generic codes, typically 8 bits so 0 to 255 or 0x00 to 0xFF, and a manufacturer code. Each value does different things based on the device, so one tv may take 0x0A to mean power on, another might use that for channel down.
Universal remotes work basically by the manufacturer gathering as much data about common IR code sets for common devices and providing the end user with a way to set that code set. The codes you put in are just like a street address, with the remote figuring out all the information it needs for that code.
TV manufacturers sometimes reuse codes from one tv to another, and some white label manufacturers reuse them (white label manufacturers make generic TVs with a store name brand). So there's a lot of overlap in codes. No one likes to reinvent the wheel.
edited 1 hour ago
Niteesh Shanbog
16418
answered 1 hour ago
Passerby
55.2k448143
So the codes on the table I've referenced are far more related to the universal remote than to the devices themselves?
– Filipe Nicoli
1 hour ago
Yes. They are basically arbitrary numbers for the order that the remote company added new code sets.
– Passerby
1 hour ago
I understand. Are you aware of any online source for these code sets?
– Filipe Nicoli
1 hour ago
YES! getzweb.net/jp1 has a huge list for multiple remote types. I use it with my Comcast remote that's really a universal remote made by UEI. Typically seen with the JP1 connector. You can google your remote type to find more. Some can be programmed with custom codes. For example, my tv code set includes codes for my android tv box and my Mac!
– Passerby
38 mins ago
add a comment |Â
up vote
2
down vote
accepted
The codes are just a reference to a set of actual IR codes. It tells the microcontroller or CPU (loose term) of the remote which type of code modulation, brand and device type to use. The standard protocols are RC5 and NEC, though there are other types. Once you know the protocol, the rest is just crafting the actual button code, which is a fairly small set of generic codes, typically 8 bits so 0 to 255 or 0x00 to 0xFF, and a manufacturer code. Each value does different things based on the device, so one tv may take 0x0A to mean power on, another might use that for channel down.
Universal remotes work basically by the manufacturer gathering as much data about common IR code sets for common devices and providing the end user with a way to set that code set. The codes you put in are just like a street address, with the remote figuring out all the information it needs for that code.
TV manufacturers sometimes reuse codes from one tv to another, and some white label manufacturers reuse them (white label manufacturers make generic TVs with a store name brand). So there's a lot of overlap in codes. No one likes to reinvent the wheel.
edited 1 hour ago
Niteesh Shanbog
16418
answered 1 hour ago
Passerby
55.2k448143
So the codes on the table I've referenced are far more related to the universal remote than to the devices themselves?
– Filipe Nicoli
1 hour ago
Yes. They are basically arbitrary numbers for the order that the remote company added new code sets.
– Passerby
1 hour ago
I understand. Are you aware of any online source for these code sets?
– Filipe Nicoli
1 hour ago
YES! getzweb.net/jp1 has a huge list for multiple remote types. I use it with my Comcast remote that's really a universal remote made by UEI. Typically seen with the JP1 connector. You can google your remote type to find more. Some can be programmed with custom codes. For example, my tv code set includes codes for my android tv box and my Mac!
– Passerby
38 mins ago
add a comment |Â
up vote
2
down vote
accepted
up vote
2
down vote
accepted
The codes are just a reference to a set of actual IR codes. It tells the microcontroller or CPU (loose term) of the remote which type of code modulation, brand and device type to use. The standard protocols are RC5 and NEC, though there are other types. Once you know the protocol, the rest is just crafting the actual button code, which is a fairly small set of generic codes, typically 8 bits so 0 to 255 or 0x00 to 0xFF, and a manufacturer code. Each value does different things based on the device, so one tv may take 0x0A to mean power on, another might use that for channel down.
Universal remotes work basically by the manufacturer gathering as much data about common IR code sets for common devices and providing the end user with a way to set that code set. The codes you put in are just like a street address, with the remote figuring out all the information it needs for that code.
TV manufacturers sometimes reuse codes from one tv to another, and some white label manufacturers reuse them (white label manufacturers make generic TVs with a store name brand). So there's a lot of overlap in codes. No one likes to reinvent the wheel.
edited 1 hour ago
Niteesh Shanbog
16418
answered 1 hour ago
Passerby
55.2k448143
The codes are just a reference to a set of actual IR codes. It tells the microcontroller or CPU (loose term) of the remote which type of code modulation, brand and device type to use. The standard protocols are RC5 and NEC, though there are other types. Once you know the protocol, the rest is just crafting the actual button code, which is a fairly small set of generic codes, typically 8 bits so 0 to 255 or 0x00 to 0xFF, and a manufacturer code. Each value does different things based on the device, so one tv may take 0x0A to mean power on, another might use that for channel down.
Universal remotes work basically by the manufacturer gathering as much data about common IR code sets for common devices and providing the end user with a way to set that code set. The codes you put in are just like a street address, with the remote figuring out all the information it needs for that code.
TV manufacturers sometimes reuse codes from one tv to another, and some white label manufacturers reuse them (white label manufacturers make generic TVs with a store name brand). So there's a lot of overlap in codes. No one likes to reinvent the wheel.
edited 1 hour ago
Niteesh Shanbog
16418
answered 1 hour ago
Passerby
55.2k448143
edited 1 hour ago
Niteesh Shanbog
16418
edited 1 hour ago
Niteesh Shanbog
16418
edited 1 hour ago
Niteesh Shanbog
16418
16418
answered 1 hour ago
Passerby
55.2k448143
answered 1 hour ago
Passerby
55.2k448143
answered 1 hour ago
Passerby
55.2k448143
55.2k448143
So the codes on the table I've referenced are far more related to the universal remote than to the devices themselves?
– Filipe Nicoli
1 hour ago
Yes. They are basically arbitrary numbers for the order that the remote company added new code sets.
– Passerby
1 hour ago
I understand. Are you aware of any online source for these code sets?
– Filipe Nicoli
1 hour ago
YES! getzweb.net/jp1 has a huge list for multiple remote types. I use it with my Comcast remote that's really a universal remote made by UEI. Typically seen with the JP1 connector. You can google your remote type to find more. Some can be programmed with custom codes. For example, my tv code set includes codes for my android tv box and my Mac!
– Passerby
38 mins ago
add a comment |Â
So the codes on the table I've referenced are far more related to the universal remote than to the devices themselves?
– Filipe Nicoli
1 hour ago
Yes. They are basically arbitrary numbers for the order that the remote company added new code sets.
– Passerby
1 hour ago
I understand. Are you aware of any online source for these code sets?
– Filipe Nicoli
1 hour ago
YES! getzweb.net/jp1 has a huge list for multiple remote types. I use it with my Comcast remote that's really a universal remote made by UEI. Typically seen with the JP1 connector. You can google your remote type to find more. Some can be programmed with custom codes. For example, my tv code set includes codes for my android tv box and my Mac!
– Passerby
38 mins ago
So the codes on the table I've referenced are far more related to the universal remote than to the devices themselves?
– Filipe Nicoli
1 hour ago
So the codes on the table I've referenced are far more related to the universal remote than to the devices themselves?
– Filipe Nicoli
1 hour ago
Yes. They are basically arbitrary numbers for the order that the remote company added new code sets.
– Passerby
1 hour ago
Yes. They are basically arbitrary numbers for the order that the remote company added new code sets.
– Passerby
1 hour ago
I understand. Are you aware of any online source for these code sets?
– Filipe Nicoli
1 hour ago
I understand. Are you aware of any online source for these code sets?
– Filipe Nicoli
1 hour ago
YES! getzweb.net/jp1 has a huge list for multiple remote types. I use it with my Comcast remote that's really a universal remote made by UEI. Typically seen with the JP1 connector. You can google your remote type to find more. Some can be programmed with custom codes. For example, my tv code set includes codes for my android tv box and my Mac!
– Passerby
38 mins ago
YES! getzweb.net/jp1 has a huge list for multiple remote types. I use it with my Comcast remote that's really a universal remote made by UEI. Typically seen with the JP1 connector. You can google your remote type to find more. Some can be programmed with custom codes. For example, my tv code set includes codes for my android tv box and my Mac!
– Passerby
38 mins ago
add a comment |Â
up vote
1
down vote
All the code does is tell the transmitting device what it's talking to. The specific commands would already be known by the transmitting device for each model.
As for how the remote knows the commands for each model, it would have to be programmed into the remote, so they would be defined and released by the manufacturer or reverse engineered.
answered 2 hours ago
thomashw
1462
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
1
down vote
All the code does is tell the transmitting device what it's talking to. The specific commands would already be known by the transmitting device for each model.
As for how the remote knows the commands for each model, it would have to be programmed into the remote, so they would be defined and released by the manufacturer or reverse engineered.
answered 2 hours ago
thomashw
1462
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
1
down vote
up vote
1
down vote
All the code does is tell the transmitting device what it's talking to. The specific commands would already be known by the transmitting device for each model.
As for how the remote knows the commands for each model, it would have to be programmed into the remote, so they would be defined and released by the manufacturer or reverse engineered.
answered 2 hours ago
thomashw
1462
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
All the code does is tell the transmitting device what it's talking to. The specific commands would already be known by the transmitting device for each model.
As for how the remote knows the commands for each model, it would have to be programmed into the remote, so they would be defined and released by the manufacturer or reverse engineered.
answered 2 hours ago
thomashw
1462
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 2 hours ago
thomashw
1462
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 2 hours ago
thomashw
1462
answered 2 hours ago
thomashw
1462
1462
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
thomashw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
add a comment |Â
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Thank you @Passerby
– Filipe Nicoli
1 hour ago