EVK-F9P-01 - User guide
UBX-22038408 - R03
Device description
Page 10 of 28
C1- Public
can utilize the USB interface to connect directly to UART1 or UART2, see the Interface description [
for configuration details.
4.3.3
DB9 connector (RS232)
The evaluation unit includes an RS232 port for serial communication that is compatible with PC serial
ports. The DB9 connector can only have the UART1 input if the user prefers not to use UART1 from
USB.
Connect using a straight RS232 serial cable with male and female connectors to the port on your PC.
The maximum cable length is 3 meters. To configure the RS232 port, use the CFG-UART1 command
in the u-center application. The maximum operating baud rate is 230400 Baud. 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 4 and diagram from
Pin Nr.
Assignment
1
Timepulse 1 output (RS232 levels)
2
TXD, GNSS Transmit Data, serial data to DTE
3
RXD, GNSS Receive Data, serial data from DTE
4
Optional time-mark input (RS232 levels) using EXTINT0 (internal jumper J6 fitment required)
5
GND
6
Timepulse 1 output (RS232 levels)
7
Not connected
8, 9
not connected
Table 4: SUB-DB9 connector pin description for EVK-F9P
4.3.4
RST button
The RST button on the front panel resets the unit.
⚠
CAUTION
Risk of data loss. The RESET pin deletes all information from the volatile memory and
triggers a cold start. Reset the system only as a recovery option.
4.3.5
Safe boot button
This is used to set the unit in safe boot mode. In this mode, the receiver executes only minimal
functionality, such as updating new firmware into the flash memory. To set the receiver in safe boot
mode:
1.
Press the BOOT button and keep holding it down.
2.
Press the RST button.
3.
Release the RST button.
4.
Release the BOOT button.
5.
If the UART interface is used, a training sequence must be sent to the receiver.
The training sequence is a transmission of 0x55 0x55 at a baud rate of 9600 baud. Wait for at
least 100 milliseconds before the interface is ready to accept commands.
4.3.6
Slide switch
Use the slide switch on the front panel to choose between I2C (and UART) and SPI
communication
ports. You must reset the unit by pressing the RST button when the slide switch has been changed.
•
I2C – In this selection the EVK operates with the UART (RS232 DB9 – rear panel or the 3.3 V level
TxD (MISO), RxD (MOSI) at the front panel). Also, the communication via 3.3 V DDC interface (I2C)
is selected.
