u-blox EVK-M9DR, User Manual

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EVK-M9DR - User guide
UBX-21049360 - R01 Contents Page 6 of 32
C1-Public
2 Device description
2.1 USB
A USB-C connector is featured for data communication and power supply. USB drivers are installed
automatically through Windows update.
2.2 UART
The unit includes an RS-232 port which can be dynamically connected to the UART of the receiver or
the onboard MCU. Selection of the UART connection is controlled by the SEL_MCU_N pin on the front
connector: when the pin is low, the MCU is selected.
☞
The selected UART interface is also available via the RxD and TxD pins on the front connector. The
pins are at TTL voltage levels.
Flow control should not be used with the RS-232 port.
2.3 Antenna
The kit includes a u-blox active GNSS antenna with a 3-meter cable. There is a female SMA connector
(RF IN) available on the front side of the unit for connecting the antenna.
2.4 14-pin front connector
The connector and its signals are described in the table below.
Pin no. Pin name I/O Level Description
14 VIN 5-24V I 5 - 24 V Power input – can be used in place of USB
13 GND Common ground pin for case-work, power and serial interface connections
12 CAN_H I Connect to the vehicle CAN high wire (ISO 11898-2)
11 CAN_L I Connect to the vehicle CAN low wire (ISO 11898-2)
10 TIMEPULSE O - Time pulse signal output
9 SEL_MCU_N I - Pull-down signal for enabling UART communication with the MCU
8 WoM O Wake-on-motion signal output
7 Wheel Tick I 5 - 24 V Wheel tick pulse input
6 FWD I 5 - 24 V Direction of travel input
5 SDA Reserved
4 SCL Reserved
3 TxD I/O 3.3 V UART TxD
2 RxD I/O 3.3 V UART RxD
1 GND_A Ground for wheel tick and direction signals
⚠
Leave the reserved pins open.
2.5 10-pin rear connector
This connector is used for updating the MCU firmware. See section 5.5 for more information.
2.6 Reset and safe boot buttons
The reset button on the front panel resets the unit.