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You are right, when I disconnected the TX from the device, the analyser started to pick up the signal. analyser -- USB -- COMPUTER -- USB -- Arduino -- 5V - 12V converter -- Device. I am not 100% sure that the ground on the device and the ground on the Arduino is galvanically connected, because of t...

Hi Andrew, Thank you for your answer. The Arduino board can receive data on the RX pin no matter if the analyzer was connected or not. Edit: I have done some experiment, and when I disconnected the RX from the Arduino (but left the TX connected that I could send the command) I saw the answer to the ...

Dear HobbyComponents, I've just bought the above mentioned logic analyser from the Amazon, and I tried to check an UART communication. On one end there is an Arduino and I see the bytes sent clearly, but I can't see anything on the RX side. The device on the other side is tolerates 5V on the UART, b...