EVK-M8L User Guide
UBX-20028627 - R01
Device description
Page 8 of 33
C1-Public
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The connector is only to be used with a GNSS antenna or simulator. Do not connect this
equipment to cable distribution systems.
3.3.2
USB
A USB V2.0 compatible serial port is featured for data communication and power supply.
3.3.3
UART
The evaluation unit includes an RS232 DCE port for serial communication that is compatible with PC
serial ports.
Connect using a straight RS232 serial cable with male and female connectors to the DTE port on
your PC. The maximum cable length is 3.0 meters. To configure the RS232 port, use the UBX-CFG-
PRT command in the u-center application. The maximum operating baud rate is 921.6 kBd.
If you are using a USB to RS232 adaptor cable, you can connect it directly to the evaluation kit RS232
port.
The 9-pin D-SUB female connector is assigned as listed in Table 3:
Pin no.
Assignment
1
not connected
2
TXD, GNSS Transmit Data, serial data to DTE
3
RXD, GNSS Receive Data, serial data from DTE
4
not connected
5
GND
6
not connected
7-9
not connected
Table 3: SUB-D9 connector pin description for EVK-M8L
3.3.4
RST button
The RST button on the front panel resets the unit. To avoid an inadvertent reset, the button is
recessed.
3.3.5
Safe boot button
This is used to set the unit in safe boot mode. In this mode the receiver executes only the minimal
functionality, such as updating new firmware into the SQI flash. In order to set the receiver in
safeboot mode follow these steps.
Press the BOOT button and keep holding it down
Press the RST button
Release the RST button
Release the BOOT button
If the UART interface has to be used, a training sequence has to be sent to the receiver.
The training sequence is a transmission of two bytes 0x55 55 at the baud rate of 9600 Bd. Wait
for at least 100 milliseconds before the interface is ready to accept commands.
