Post by Markoz on Jan 13th, 2017 at 4:14am
In the image above, the green squares surround the controls for Com1. The black square, with the word MIC on it, is for transmitting, and the white button/dial is for recieving.
The red squares surround the controls for Com2. The black square, which is blank, is for transmitting, and the white button/dial is for recieving.
In the image, I have the Com1 set to transmit AND recieve, while the Com2 is set for recieve ONLY (as you can see, it is recieving the ATIS, but the ATC shows that I can still send/recieve on Com1).
The blue circles surround the controls for the IDENT for the MKR. I think NAV1/NAV2 IDENT buttons are to the left of that, OR it is the L, C, R, markings on the same switch as the MKR, and you need to position it to those markings, then click on the button/dial in the small blue circle.
Download the Part II - Aircraft and Systems (csx777_manual2.zip), and you will find detailed info on the Radios for the 777, on page 35.