How can four GPS16X-HVS receivers be connected to the COM ports of a data logger to read all four NMEA strings?

This can be done, but only one GPS() instruction can be included in a program because it is not desirable to have multiple inputs competing for clock synchronization. Use the SerialOpen() and SerialInRecord() instructions to pull in the data from the multiple sensors, and use the SplitStr() instruction to parse the data out.

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