Does each one of this module has a·unique ID? In other word, can I have more than two of these module communicate to each other.·There is no maual on the website.
Coolguy,
These are simply transceivers. When you send data to one (via the xmit pin) it broadcasts that data out as a radio signal. Any receiver on the appropriate frequency within range·can receive the data. If you need to individually address a specific piece of data to a specific receiver, then you must program whatever is attached to the receiver to recognize that a given piece of data is intended for it...this is typically wrapped up in what is called the protocol and can be handled by several methods...the most prevalent being embedding some code within the data that will be recognized by the receiving device.
The specifics of this have been discussed elsewhere on this forum.
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Truly Understand the Fundamentals and the Path will be so much easier...
Post Edited (Tom Walker) : 7/6/2007 12:35:31 PM GMT
Tom is correct…Typically in microcontroller applications devices on a common radio system are addressed by sending an ID out to slave radios and only the addressed radio unit responds. This is a polled system and works quite well when you need to be able to have multiple listeners. An advantage is you would be able to broadcast messages to all modules within range at the same time.
Addressable modules like our EB500 use a MAC address to establish a connection. One downside is that you can only connect to one module at any time. If you wish to talk to another module you must sever that connection and establish a new one. In any event there is an insert (condensed documentation) inside each package for the 912 MHz RF Transceivers. I will try to get a PDF of that online today. Take care.
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How is this module working for you? Have you see any loss data, loss connection? Have you actually test how far these units can communicate? Any other problems you see?
Coolguy
Posts: 26
Comments
These are simply transceivers. When you send data to one (via the xmit pin) it broadcasts that data out as a radio signal. Any receiver on the appropriate frequency within range·can receive the data. If you need to individually address a specific piece of data to a specific receiver, then you must program whatever is attached to the receiver to recognize that a given piece of data is intended for it...this is typically wrapped up in what is called the protocol and can be handled by several methods...the most prevalent being embedding some code within the data that will be recognized by the receiving device.
The specifics of this have been discussed elsewhere on this forum.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Truly Understand the Fundamentals and the Path will be so much easier...
Post Edited (Tom Walker) : 7/6/2007 12:35:31 PM GMT
Tom is correct…Typically in microcontroller applications devices on a common radio system are addressed by sending an ID out to slave radios and only the addressed radio unit responds. This is a polled system and works quite well when you need to be able to have multiple listeners. An advantage is you would be able to broadcast messages to all modules within range at the same time.
Addressable modules like our EB500 use a MAC address to establish a connection. One downside is that you can only connect to one module at any time. If you wish to talk to another module you must sever that connection and establish a new one. In any event there is an insert (condensed documentation) inside each package for the 912 MHz RF Transceivers. I will try to get a PDF of that online today. Take care.
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Chris Savage
Parallax Tech Support
I just bought two of the new 912 MHz transreceivers to use between my PC and my robots.
I was considering the same problem as you, how to talk to individual slave transreceivers from a master transreceiver.
This is the same problem addressed in the Basic Stamp 2p: Commands, Features and Projects which is available in the Parallax Download area.
In the Basic Stamp 2p book the author had a Master Stamp and two Slaves on the same serial line.
The author shows how one Master Stamp can address two different Slaves on the same serial line without interference.
Hope this helps.
Regards,
TCIII
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If you are going to send·a Robot·to save the world, you·better make sure it likes it the way it is!
How is this module working for you? Have you see any loss data, loss connection? Have you actually test how far these units can communicate? Any other problems you see?
Thanks,
Coolguy