The Instek GPM-DA4 DA4 Interface must be installed before leaving the factory for use with the GPM-8310 Digital Power Meter. The GPM-8310 is a digital power meter for single-phase (1P/2W) AC power measurement. For the needs of external signal control or the use of data recorder to record data, it can be connected to an external controller such as PLC or a data recorder to meet the application of automatic measurement or long recording.

The Digital I/O (DA4) interface provides 3 different modes: the external control mode, the DA4 output mode and the self-defined output mode based on user settings. When the setting is in the external control mode, it allows users to activate, stop, trigger or reset the integration measurement function through external signals. When the setting is in the DA4 output mode, users can define 4 measurement parameter values from the 25 measurement parameters provided (even with the result of integration measurement) to produce outputs by a fixed level (full scale +5V) or a manual level (full scale ±5V) and receive results by collocating with a data recorder. When the setting is in the self-defined output mode, a communications interface is required to control the action of each defined pin through commands.