Using USB communication in pre 2021 units

Discussion and support for the Nmea2Wifi multiplexer - a 2-input Nmea 0183 wifi multiplexer.
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Luis Sa
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Joined: Thu May 04, 2017 4:12 am

Using USB communication in pre 2021 units

Post by Luis Sa » Wed Feb 17, 2021 4:34 pm


With firmware 6.4, you can use USB to communicate between the multiplexer and a PC or laptop. However you need to make a small modification on the PCB. You need to solder a 470R resistor between the TX and D4 pin of the Wemos D1 mini board. The resistance should be soldered under the PCB. Remove the 4 screws that hold the PCB to the box plate and place the resistance as shown in the following picture.


Regards, Luis

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