Serial Port Connector - Locosys RTK-M100 User Manual

Pin 4: IO_PWR, power input for IO pin 1 ~ 4. Input voltage range is 3.3V~5.5V.
Pin 5: IO_01, general purpose IO pin 1. Logic level is based on the voltage of IO_PWR.
Pin 6: IO_02, general purpose IO pin 2. Logic level is based on the voltage of IO_PWR.
Pin 7: IO_03, general purpose IO pin 3. Logic level is based on the voltage of IO_PWR.
Pin 8: IO_PWM, general purpose IO pin 4.Logic level is based on the voltage of IO_PWR.

4.6. Serial port connector

The external host CPU can communicate with the product through the serial port. The
protocol is 115200-8-N-1 (115200 baud, 8 data bits, no parity, 1 stop bit). The 6-position
connector of the serial port is compatible with Hirose's DF13 series. The pin description of the
connector is in the following.
Pin 1: NC, not connected.
Pin 2: TX, transmit data to the external device. (3.3V)
Pin 3: RX, receive data from the external device. (3.3V)
Pin 4: NC, not connected.
Pin 5: PPS, pulse per second.
Pin 6: GND, ground.
TX and RX signals of the serial port and USB-UART bridge IC connect to the same UART port
of the product's internal CPU module. If both serial port and Mini USB connector are connected,
the serial port will dominate the communication with the internal CPU module.
RTK-M100 User's Manual
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