rf 433 MHz : Transmitting data from UART

@dossdss-4lCGQo • Oct 23, 2024

Oct 23, 2024

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Dear #-Link-Snipped-#,
please help me with RF 433 tx rx pair.
i am transmitting data from UART at the receiver of RF 433 i am getting inverted bit pattern of the transmitted serial data.
so is it the characteristics of this pair to invert the bits. cause its nowhere said so .
so please help.
the datasheets are here.
these are not the exact modules am using but very similar to them.
anybody's help is most appreciated.
thank you.

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[Prototype]

@prototype-G9Gn5k • Dec 29, 2012

No! The bits won't be received as inverted as far as I know. Though I've always used them with HT12X IC's. Never used them in any other configuration.
Make sure your Tx and Rx are in synchronization.
dossdss

@dossdss-4lCGQo • Dec 29, 2012

#-Link-Snipped-# thanks for reply.
how can i check that tx n rx are in sync ?
i transmit the byte and receive the byte n observe both bytes on DSO. little phase difference in transmitted n received data, n inverted bits are found.
start n stop bits are inverted too. 10100110 = 01011001.
[Prototype]

@prototype-G9Gn5k • Dec 29, 2012

dossdss
#-Link-Snipped-# thanks for reply.
how can i check that tx n rx are in sync ?
i transmit the byte and receive the byte n observe both bytes on DSO. little phase difference in transmitted n received data, n inverted bits are found.
start n stop bits are inverted too. 10100110 = 01011001.
I don't have any idea about this. Sorry.
Harshad Italiya

@harshad-ukH5ww • Jan 1, 2013

Yes You are right you will get inverted Bits if you are using it in current way You can do just one thing either from transmission or at reception side inverted the bit. This will be the easiest solution.

Hope it works.