# Rasperry Pi 4 Serial port RX issue
**URL:** https://discourse.nodered.org/t/rasperry-pi-4-serial-port-rx-issue/47202
**Category:** Forum Help
**Created:** [15 June 2021 20:48 UTC](https://discourse.nodered.org/t/rasperry-pi-4-serial-port-rx-issue/47202 "2021-06-15T20:48:50Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@dsplitz](https://discourse.nodered.org/u/dsplitz)
#### Post date: [15 June 2021 20:48 UTC](https://discourse.nodered.org/t/rasperry-pi-4-serial-port-rx-issue/47202/1 "2021-06-15T20:48:50Z")
I've been successfully using NODE-RED for a few weeks now on my laptop. It was decided we want to use a Raspberry Pi as our NODE-RED platform so I bought a Pi4 and IO board. I've started by enabling the mini-UART and using a terminal emulator (CuteCom) wired to the laptop running Tera Term. I could get TX (Pi to Laptop) fine but no RX (Laptop to Pi). I then disabled the BT so I could use UART1. I now have full duplex communication using CuteCom to Tera Term.
Next I loaded Node-Red and made a simple simple serial port flow with an inject node connected to the serial out and diag node to serial in. I again can only get TX functionality of Node-Red to Tera Term.
I also have a Raspberry PI3. I did all the same steps with the same result. What could I be doing wrong here?
Update:
I enabled UART2 on my PI4. Again I can send and receive using terminal emulators but cannot receive using NODE-RED. Any suggestions are welcome!!
I tried using the serial request node and it seems to work. Only the serial in node not working. I may be able to make the request node work for my application but it will create more work. I am still hopeful that someone can help me out.
I have solved my issues, no need to comment.
With UART2 I just needed to adjust the timeout then everything worked.
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### Author:  [@alexander77](https://discourse.nodered.org/u/alexander77)
#### Post date: [17 June 2021 21:03 UTC](https://discourse.nodered.org/t/rasperry-pi-4-serial-port-rx-issue/47202/2 "2021-06-17T21:03:20Z")
I use the uart1 often. It works for me when i disable the serial console in the interface setup.
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### Author:  [@dsplitz](https://discourse.nodered.org/u/dsplitz)
#### Post date: [18 June 2021 13:32 UTC](https://discourse.nodered.org/t/rasperry-pi-4-serial-port-rx-issue/47202/3 "2021-06-18T13:32:08Z")
Thank you for your reply.
Now that I have UART2 working, I've moved on. Hopefully i won't run into this issue again.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [17 August 2021 13:33 UTC](https://discourse.nodered.org/t/rasperry-pi-4-serial-port-rx-issue/47202/4 "2021-08-17T13:33:04Z")
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