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Author Topic: Interfacing with more than one tx/rx serial device  (Read 169 times)
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mikejonesab1
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« on: January 17, 2013, 10:08:18 pm »
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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
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CrossRoads
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« Reply #1 on: January 17, 2013, 10:20:30 pm »
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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
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PaulS
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« Reply #2 on: January 18, 2013, 05:59:04 pm »
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You can also use SoftwareSerial to talk to one of (or both of) the devices.
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