4. Interfaces
PNT-SG3FS Evaluation Kit User Guide
12
20B
UART Interface
The UART interface (highlighted in Figure 6 below) is provided via the micro-USB connector.
Figure 6. USB/UART Connector
The UART interface is used to trace NMEA messages and to upload binary files
.
Before using Silicon Labs’ CP2104 UART-USB bridge chip located inside the
PNT-SG3FS-EVAL
unit, install the Virtual COM Port (VCP) driver. The driver can be downloaded from the
Silicon
Labs (Silabs)
web page:
https://www.silabs.com/documents/public/software/CP210x_Universal_Windows_Driver.zip
The VCP device drivers allow the CP2104 device on the
PNT-SG3FS-EVAL
to appear to the
PC's application software as a standard COM port. Application software running on the PC
accesses the CP2104 device as it would a standard hardware COM port configured
as shown in
Table 1. Data transfer between the PC and the CP2104 device is performed over the USB
interface.
Table 1. UART Configuration
Baud Rate
Data Bits
Stop Bits
Parity
Handshake
9600 Baud
8 Bits
1 Bit
none
none
21B
GNSS Input Antenna
GNSS input is available through an SMA female connector, highlighted in Figure 8 below.
Figure 7. GNSS SMA Connector
A passive or active antenna can be used on the PNT-SG3FS-EVAL.
The DC power supply for active antenna is 3V3 with current limitation in case of a short circuit.
