It is possible to send NMEA over IP messages to the sensor. These messages can either be TCP or UDP over port 10110 and can also be broadcast packets over the same port. If the message is broadcast over the same port, other devices will receive this packet which may not be desired.
The NMEA sentence structure and syntax are exactly the same as that presented on the wired GPS serial interface. <<<Make sure to look up how to generate checksums as the sensor will validate the NMEA sentence in this way, too.>>> The sentence will need to be terminated with one of the following: <CR><LR> combination; <CR> by itself; or <LF> by itself.
In order for the sensor to actually process the NMEA sentence and synchronize its internal top-of-hour counter with the timestamp provided in the NMEA sentence, an external PPS signal needs to be present. There is a discrete wire running to the PPS pin on the interface box.
The PPS signal may be issued concurrently or sequentially. Reception of the GPRMC sentence must conclude no more than 300 ms before the rising edge of a subsequent PPS pulse. The pulse width is not critical (typical lengths are between 20 us and 200 ms).