Ecom i.roc x20 Series Manual page 129

If AFI is activated, you can specify the AFI value through the numeric
up-down control. In AFI mode, only those transponders are read or
written to which AFI match the defined AFI.
If singleshot check box is checked the response will be in the single
shot, otherwise we will have a permanent output.
If the preload check box is checked, in case of a write command, data is
written to the next transponder, otherwise, data is written to the
transponder currently within antenna range.
If SNR checkbox is checked it means that serial number is transmitted
in telegram, otherwise serial number is not transmitted in telegram.
If anticollision check box is checked, it means that the anti-collision is
activated otherwise is deactivated.
If report mode check box is checked, the device works in report mode,
otherwise it works in online mode.