Alright, for the lulz if you’re having trouble making heads from tails.
The Left DDI is showing the FCS display. This basically gives you a semi-graphical representation of what your flight control surfaces are doing and what your Flight Control System (Fly By Wire) is up to.
The Right DDI’s got a lot more going on. This is the STORES page, which is analogous to the DSMS on the A-10C. The center of the image is occupied by a graphical representation of stores currently located on the aircraft (in this case AIM-9Ms on the wing tips, Mk-82 Slicks on 2xMERs loaded on the wing and center stations, and a full load of guns. The cheek pylons are empty).
Let’s move clockwise around the RDDI starting at the top left.The top row of the aircraft are weapons currently available for the selected master mode (in this case the only option is Mk-82s for Air to Ground). If multiple types of weapons were available, they would show along this row, one weapon per button. Once all of each weapon type is expended the button option will disappear.
Along the right side of the DDI is the button for the M61 Cannon’s air to ground gun sight. Next is the step button, which will cycle the selected station between stations currently loaded with the selected weapon. Below that is the UFC button, which allows editing of the currently selected weapons program via the UFC. If you look at the UFC, you can see available options are QTY and MULT. QTY is the number of bombs dropped per pulse, or multiple. MULT is the amount of pulses or multiples. In this case the aircraft will drop a single Mk-82.
The DATA option is sort of arcane for everyday use. When pressed DATA will be boxed (like UFC is currently), and upon pressing the weapons release button, a block of information will appear below the PROG block showing information about the aircraft’s position and orientation at time of release. 0335 is the current time (time zone is configurable) in MMSS format. I dunno what tone does. I image it’s for testing the state of the sidewinder, but again, I dunno. The PROG button will cycle between pre-loaded weapons programs, again, similar to the DSMS in the A-10C. Each weapon can have up to four pre-stored programs, and that information is editable using the UFC button and the information on the left side of the DDI. Current program information is stored in program data block.
DRAG allows the pilot to select either low or high drag configurations for weapons AIR/Snake Eye type weapons. EFUZ and MFUZ have to deal with how the weapon is fuzed for delivery. This is a bit of an arcane science, and so far DCS has not simulated it, so I won’t go into detail. MODE cycles between the available delivery modes for the weapon. For everything that’s not a JDAM or UBER-WUNDERWAFFE-900, this means CCIP, AUTO (think CCRP), MANUAL, and Flight Director (which is a more controlled variant of CCRP).