5.6.1 Host Interfaces

Data sent to the board controller through the VCOM interface is available in two different ways to the user. At the same time, data can

be sent to the target device using these interfaces:

• Virtual COM port using a standard USB-CDC driver.

• TCP/IP, by connecting to the Wireless STK on TCP/IP port 4901 with a Telnet client.

When connecting via USB, the device should automatically show up as a COM port. Some examples of device names that can be as-

sosiated with the kit:

• JLink CDC UART Port (COM5) on Windows hosts

• /dev/cu.usbmodem1411 on macOS

• /dev/ttyACM0 on Linux

Note that these are only examples of what the device might show up as, and the actual assignment depends on the operating system,

and how many devices are or have been connected previously. Data sent by the target device into the VCOM interface can be read

from this port, and data written to this port is transmitted to the traget device.

Connecting to the Wireless STK on port 4901 gives access to the same data over TCP/IP. Data written into the VCOM interface by the

target device can be read from the socket, and data written into the socket is transmitted to the target device.

Note: Only one of these interfaces can be used at the same time, with the TCP/IP socket taking priority. This means that if a socket is

connected to port 4901, no data can be sent or received on the USB COM port.

5.6.2 Serial Configuration

By default, the VCOM serial port is configured to use 115200 8N1, with flow control disabled/ignored. (115.2 Kbit/s, 8 databits, 1 stop

bit). The configuration can be changed using the Admin Console:

WSTK> serial vcom config

Usage: serial vcom config [--nostore] [handshake <rts/cts/rtscts/disable/auto>] [speed <9600,921600>]

Using this command, the baud rate can be configured between 9600 and 921600 bit/s, and hardware handshake can be enabled or

disabled on either or both flow control pins.

UG261: EFR32MG12 2.4 GHz 10 dBm Radio Board User's Guide

Peripherals

silabs.com | Building a more connected world.

Rev. 1.02 | 21