From the DCS F-18 manual:
Weapon select switch. Four position switch which selects A/A weapon in A/A aircraft master mode.
Switch functions are discrete inputs.
• Forward: Activates AIM-7, displays the priority missile. Commands a radar antenna four
bar elevation, 140° azimuth scan, 40-mile range selection, and interleaved prf.
• Center Push: Activates AIM-9 and displays the priority missile. Commands a radar
antenna four bar elevation, 90° azimuth scan, 10 mile range selection for AIM-9P and AIM9M / 20 mile range for AIM-9X, and interleaved prf.
• Aft: Activates gun and displays gun. Commands GACQ to the radar system, a range of
5nmi, radar antenna azimuth scan of five bars, with 20° elevation scan (vertical scan).
Configures sensor control switch to the ACM condition.
• Right: Activates AIM-120 and displays priority missile. Commands a radar antenna four
bar elevation, 140° azimuth scan, 80 mile range selection for AIM-120B / 160 mile range
election for AIM-120C, and interleaved prf.
Note: If a target is tracked in STT or as an L&S, the weapon select swich should only change
the weapon and not affect radar operation based on weapon selection.