All the following devices can be used to generate event to trigger some action at the software level, such as start/stop recording, mark frame, pre-post...
External I/O devices:
Norpix USB trigger box.
Cameras and frame grabbers that include digital Input/Output lines:
Discontinued products that cannot be purchased anymore but still supported:
Note: If your product is currently not listed, check with Norpix technical support to see if it can be added.