For Kasli you can use artiq_flash start
, or artiq_coremgmt reboot
with ARTIQ-7.
Zotino only has simple state and usually does not need reset. You can program a startup kernel that reinits it and sets outputs to 0 if you want.
The TTL card has no state.
I suppose "RF channels" are Urukul. The AD991x chips cannot be fully reset due to an oversight by ADI in their silicon design.