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Interfacing to DP0201 (NEO-M8U GNSS + LIS3MDL compass)

peace be to u
hi

is there a schematic of the the DP0201 (NEO-M8U GNSS + LIS3MDL compass) board ?

i need to know how the comms lines on the GPS and the magnetometer are connected and exposed on the JST connector.

Are both the ublox m8u and the LIS3MDL connected to the I2C bus ?
if so how (series/parallel)?

Are both the ublox m8u and the LIS3MDL connected to the Serial port (UART TX/RX lines) ?
if so how ?

If i want to access both ublox m8u and the LIS3MDL do i connect to the ublox m8u via serial port (UART) and separately connect to the LIS3MDL via the I2C port ?

Are the TX and RX lines for the serial port swapped already ?
i.e. do i connect External TX to DP0201 TX
or do i connect External TX to DP0201 RX
and similarly:
do i connect External RX to DP0201 RX
or do i connect External RX to DP0201 TX

Also will the DP0201 still work if i supply 3.3V or do i have to supply 5V ?

many thanks
stay in peace