Yes, you have to "switch" the lines between the IR Unit and the Atom :
One side is Tx -> RX, the other side RX -> TX
White line: IR Unit receives the signal and transmitts it(TX, marked "data" IN) ) to the Atom,. Atom is receiver (RX), (G32 as input)
Yellow line: Atom is the sender (TX) (G26 as output), IR Unit receives the data (RX) (marked "data" OUT) and transmitts the signal via IR (25Hz carrier) Check if it works with a mobile phone camera ...