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Topic: Interfacing with more than one tx/rx serial device (Read 467 times) previous topic - next topic

mikejonesab1

So I know the catch is that only one device can use the tx and rx lines. I have two devices that require serial tx/rx communication. Is there a way around this problem? I was thinking a switch that can be switched on/off with one of the other digital pins? Thoughts? Thanks in advance.

--Mike

CrossRoads

Well, the Uno can Tx to both at same time.
Need a way to only Rx from one at a time.
What voltage levels are being used? TTL? RS232? RS485?
With TTL, you could use a pin as you suggested to enable one Rx line or the other thru their own 74HC125 buffer.
http://www.digikey.com/product-detail/en/74HC125N,652/568-1393-5-ND/762997
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

PaulS

You can also use SoftwareSerial to talk to one of (or both of) the devices.

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