Arduino Nano Serial connectivity issue

Other Hardware 3rd Party Boards
1

Hey guys,

I've been working with Arduinos for a while and I've never had any major issue so far. But now I found myself struggling using hardware serial of my Arduino Nano. Just to introduce, I have been doing a lot of programming using Serial Communication to control external modules or even to control other Arduinos through a PC. I often use matlab to do that. It's not first time for me.

But, right now I am experiencing some issues that I could not understand and that why I seeking your help.

My program is quite simple in arduino, just receive from Serial and send an answer back acknowledging communication.

If I use the USB connection of arduino nano board, I can receive and transmit through the Serial Monitor with no problem at all.

However, if I try to use the RX0/TX0 hardware port connected directly to and External FTDI module, it seems nothing is sent back.

I am sure the FTDI adaptor is working properly. However somehow, arduino is not interpreting the information.

Can someone give me an hand here?

cheers,

2

Are you sure you don't have Rx/Tx swapped to the FTDI? You have Gnd connected also?

3

CrossRoads:
Are you sure you don't have Rx/Tx swapped to the FTDI? You have Gnd connected also?

yes I'm sure.
Tx from arduino goes to Rx of FTDI
Rx from arduino goes to Tx of FTDI.

FTDI, even though is a clone, if I connect it b2b i.e. shunt from Rx to Tx, I get back what Im sending as expected.

I suppose the issue is in Arduino.