@pablocool:

Now I understand your way of working: the FTDI module is connected to a PC on the USB side, and directly to the DEBUG connector in the receiver, skipping the TTL->RS232 voltage conversion twice. Clever, but I use a standard COM-port in by destop PC which has RS232 levels so I need the MAX(3)232 approach only on the receiver side.
Thank for adding your photo, it made me understand.

Regards,

Audioniek.