- Joined Oct 25, 2007
hiThere is some problem in understanding here - the Tx & Rx devices do not work as and are not meant to send variable data. The sole function of the transmitter is to send a code that results from the address switch selection. The sole purpose of the receiver is to compare the received code with the set address bits it has. If they match, it generates a logic signal that can start opening/closing a garage door.
If one wished to use one of these transmitters to send data, he would have to make up a table of codes, one for each address switch combination. These would be selected by using the data to address the chip in place of the switches. The receiver is very limited. It might be necessary to scan through the addresses to generate a code match, which could then be decoded back to ASCII or whatever. The problem is that there will be some minimum time to scan all address switch combinations and wait for a match indication. That time is then the minimum time for each transmission. And there's no way to handshake the process.
Smoke signals might be faster.
Reading the brag on the switch to FSK indicates that the maker is quite happy about signal-to-noise improvements. The transmission only has to cover 50 meters or so. Reading an earlier post or the data sheet will let you discover why the data bits come on in the high state.
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