The D8N is using the NMEA XDR message to transmit the status of its 8 opto-isolated inputs at 1 Hz.
Originally as a result of a customer request, we have added an alternative software version that will also transmit a new message each time there is a status change of any of the inputs in addition to the 1 Hz “background” activity.
These and other special software versions are available to all customers. Please define your requirements and we will find out if we have what you need or any similar solution available.