I just received a YN685 (Nikon) and a YN622N-TX (For Nikon), serial numbers 69020032 and 02072849. The firmwares are 1.08 (YN622) and 1.3.4 (YN685).
However I try I cannot seem to get wireless communication working between the two.
I am testing this: Both units stand-alone (YN622) not connected to camera.
Flash set to "622 R Slave" mode, Channel 1, Group C. Zoom set to Auto. The slave indicator of the flash (two red LEDs in the front) is blinking. On the transmitter, Group C, channel 1 selected. Group C set to TTL.
Now I believe that the flash should zoom according to the setting on the transmitter (622), which does not happen. When I press the "Test" button of the transmitter nothing happens.
What could be the problem?