and 
Sharing NMEA
Kaupoi asked 4 years ago
Ardusimple Staff answered 4 years ago
If you bridge the TX and RX pins in UART2, you will have the NMEA string available also from the USB used by the XBee.
You can only do this if you are not using a radio mounted in the XBee header.
KaupoiI’m using lora xbee.
So usb hub won’t help?
ArdusimpleAs far as we know, USB splitters do not exist.
A USB hub allows you to connect several USB devices to a computer, but not a USB device to several computers.
You have another option, which is to set UART1 to output NMEA protocol and use a UART to USB adapter (you need to get one, but they are not expensive).
dskumherCan I use Empty XBee USB of rover simple RTK2board to get RTCM correction stream from NTRIP client ? If yes, then Which TX/RX pins of UART2 to be connected to empty which XBee TX/RX pins so that XBee USB can be used as COM PORT for getting output of NTRIP client ?
My other device that needs NMEA has RS232 db9-plug. So if I make a db9 plug to simple connecting: TX1 to db9 pin-2, RX1 to 3 and GND to 5, then use serial cable to connect to my device, it should work?
You will need a UART to RS232 adapter since the voltage levels are different, they have also popular prices 🙂
So this should do the trick? https://www.artekit.eu/products/accessories/ak-rs232/
Yes, it should
Kaupoi answered 4 years ago
Any ideas?
Kaupoi answered 4 years ago
GND – GND
TXD – TX1
RXD – RX1
Vcc – 3V3_OUT – IOREF
…without smoke. Now I have USB and RS232 supplying NMEA. I might need to order few more of these… 😉
Thank you.
Vcc – 5V_OUT – IOREF works too. Should I use that?
clive1The ST3232 is capable of taking a range https://www.st.com/resource/en/datasheet/cd00002253.pdf
Using 5V_OUT won’t eat into the current budget of the 3V3 regulator.
While the uBlox part is tolerant of higher levels, I would lean toward using the 3V3 supply.
I will also note, if you need multiple NMEA RS232 feeds, you could just use the TX1 output, and fork it to multiple adapters.
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