Lem has a story from Pirx the Pilot series about a robot accidentally transmitting Morse code messages that was related to people who died long time ago. Pirx

Lem has a story from Pirx the Pilot series about a robot accidentally transmitting Morse code messages that was related to people who died long time ago. Pirx thought initially that messages were just a recording, but then he asked a question and got an answer from the robot as if from those people. Was it that?