Question: no ibus output on Tx pin on Transmitter (without reciever)

[Fireflaker]

Hi!

I have been trying to use a fs-i6 as a game controller for fpv simulator without receiver. How to get fs-i6 to output ibus on tx pin in trainer port without receiver? it is on flyplus 1.7.6 firmware.

I probed around with oscilloscope - there is no sign of signals on tx pin