The 1NMEAto4R is assigned to be used for the distribution of data, from two
alternative NMEA sources to 4 outputs. Due to the redundancy, if the NMEA
connection lost at channel 1, the module will switch over automatically to
the second input. At the same time the alarm relay opens. The inputs are
galvanic isolated to each other and also to the power supply and the outputs.
The power supply is also designed redundant. At black out of both power
supplies or if the module is switched off, the alarm relay will opened and the
first input will looped directly to the first output.