A common interface is used in showlaser industry to operate laser projectors by computer control. As interface the DB-25 connector is used, as the signal transmission is done in a parallel transmission. The signal transmission itself does not use a modern protocol type, like used e.g. in ethernet networks or other serial transmission types, but it is a very low-level transmission that only modulates the voltage on every pin - usually in a range of 5V difference (-2.5V - +2.5V or 0V - 5V).
This so called "ILDA connection" is a rather old transmission method, however it is used for nearly all computer controllable laser systems at the moment.
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