The diagram is for vu + Zero
I made a cable according to this method - does not work with the vu + solo 4k
I found another diagram for vu + solo se v2 - this is not checked by me
1 - LED
2 - GND
3 - IR signal
4 - VCC (+ 5V)
5 - TxD (RS232 level - goes to RxD on PC)
6 - RxD (RS232 level - goes to TXD on PC)
Is the second diagram ok ?