sparkfun ZED-F9P Hook-Up Manual page 12

UART/Serial
The classic serial pins are available on the ZED-F9P but are shared with the SPI pins. By default, the UART pins
are enabled. Be sure the SPI jumper on the rear of the board is open.
TXO/SDO = TX out from ZED-F9P
RXI/SDI = RX into ZED-F9P
There is a second serial port (UART2) available on the ZED-F9P that is primarily used for RTCM3 correction data.
By default, this port will automatically receive and parse incoming RTCM3 strings enabling RTK mode on the
board. In addition to the TXO2/RXI2 pins we have added an additional 'RTCM Correction' port where we arranged
the pins to match the industry standard serial connection (aka the 'FTDI' pinout). While we label this as
"Bluetooth" on the back of the board, you can still connect any transceiver or serial-to-USB converter to this port.
This pinout is compatible with our Bluetooth Mate and Serial Basic so you can send RTCM correction data from a
cell phone or computer. Note that RTCM3 data can also be sent over I C, UART1, SPI, or USB if desired.
The RTCM correction port (UART2) defaults to 38400bps serial but can be configured via software commands
(checkout our Arduino library) or over USB using u-center. Keep in mind our Bluetooth Mate defaults to
115200bps. If you plan to use Bluetooth for correction data (we found it to be easiest), we recommend you
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