Electronics > Beginners

LED indicator for data pin

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Lucky-Luka:
Hi all
I would like to understand the connections that allow leds to blink as Tx and Rx are working in a serial communication.
In the video I show what I mean.
I have a connection between a FPGA and a breadbord with a PIC.
I want to include in my pic board the little board with the max3232 so I was wondering how to connect leds to show when some data is flowing.
Are they in parallel with data lines? In such a way don't they change signal levels?
Cheers

https://youtu.be/kKMO86WT7o4

Rerouter:
In general they are in parrellel with the data lines, as most TTL signalling is active low, they have a pullup from positive to limit there current to 0.5-2mA, and when the RX or TX goes to ground they light up.

Lucky-Luka:
Hi
so, if I've correctly understood, I should do something like the attached image (image found on internet).
Am I right?
Cheers

Rerouter:
You want the top half of the image, not the lower half

Lucky-Luka:
With the top half part of the image don'tI change the level of the pin input?
btw which R value should I use?
Cheers

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