LPCXpresso IDEのトピックUART signals?

UART signals?

lpcware — Wed, 15 Jun 2016 22:26:39 GMT

Content originally posted in LPCWare by ECamino on Thu Aug 01 06:51:32 MST 2013
Hi,

In one of our applications, we have to drive an optoisolator input with the UART. Is there a way to invert the TX/RX signals from the UART (LPC1347)?

Thanks,

EC

Re: UART signals?

lpcware — Wed, 15 Jun 2016 22:26:40 GMT

Content originally posted in LPCWare by js-nxp on Thu Aug 01 15:09:54 MST 2013
If you wire the optoisolator correctly there is no need to invert the signals.

edit why is my signature appearing twice??

2nd edit WOW things are moving fast, the whole interface seems to have now changed.

Re: UART signals?

lpcware — Wed, 15 Jun 2016 22:26:40 GMT

Content originally posted in LPCWare by graynomad on Fri Aug 02 01:01:19 MST 2013
As John says, just wire the opto correctly, either the way you drive the LED or the way you pull the output. Either way can be used to invert the signal.

______
Rob

Re: UART signals?

lpcware — Wed, 15 Jun 2016 22:26:41 GMT

Content originally posted in LPCWare by ECamino on Fri Aug 02 06:03:06 MST 2013
Thanks guys. We are driving through a cable and did not make provisions to power the anode through the cable and drive the buffer on the cathode to sink and invert the signal...I guess we'll have to make a revision to provide for 5V at the anode on the external opto.

EC