The NMEA4WIFI multiplexer has four input serial ports named as P1, P2, P3 and P4 and one serial output port, named as P5. The baud rate of serial ports P1 and P2 is adjustable between 4800, 9600, 19200 or 38400. The baud rate of P3 and P4 can be 4800 or 9600 baud. The baud rate of port P5 can be 4800, 9600, 19200, 38400, 57600 or 115200. It is important to note that if the baud rate of the output port is inferior to those of the input ports, data may be lost. Also, all data output by P5 is also output by the USB port of the processor module of the multiplexer. Ports P1 and P4 have special modes of operation. If you set USB on the baud rate selection box of port P1, data on that port is not taken from the PCB connector but, instead, it is read from the USB port of the processor module. In that case data is read at the baud rate specified for P5. The special mode of P4 is called SeaTalk. If you choose that mode data is assumed to be in the SeaTalk format and it is immediately translated to the Nmea 0183 format. The wide text boxes for each serial ports refer to NMEA0183 sentence filtering. If you do not need sentence filtering, you enter 0 (zero) in these boxes. See here for an explanation about sentence filtering. Data received on the input ports P1, P2, P3 and P4 can be transmitted by output port P5 or by wifi either using the UDP port, the TCP port or both.

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