The GAP-SENSE command is used to configure the system to use the transmissive sensor for detecting media and synchronization marks. This is the recommended setting for media with gaps or notches. This command is the opposite of BAR-SENSE.
GAP-SENSE takes an optional parameter which is used to set the detection threshold.
Once set, either in a label or utilities session, it is persistent for all subsequent labels until power off. The setting (as well as the threshold) can be made permanent using the zpl.save SGD. See the examples for more information.
The setting is shared with the ZPL setting specified by ^MN, and is equivalent to ^MNW.