Segger J-Link - Virtual COM Port (VCOM)

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5.15 Virtual COM Port (VCOM)

5.15.1 Configuring Virtual COM Port

In general, the VCOM feature can be disabled and enabled for debug probes which

comes with support for it via J-Link Commander and J-Link Configurator. Below, a

small description of how to use use them to configure the feature is given.

Note: VCOM can only be used when debugging via SWD target interface. Pin 5 =

J-Link-Tx (out), Pin 17 = J-Link-Rx (in).

Note: Currently, only J-Link models with hardware version 9 or newer comes

with VCOM capabilites.

5.15.1.1 Via J-Link Configurator

The J-Link software and documentation package comes with a free GUI-based utility

called J-Link Configurator which auto-detects all J-Links that are connected to the

host PC via USB & Ethernet. The J-Link Configurator allows the user to enable and

disable the VCOM. For more information about the J-Link Configurator, please refer to

J-Link Configurator on page 167.

5.15.1.2 Via J-Link Commander

Simply start J-Link Commander, which is part of the J-Link software and documenta-

tion package and enter the vcom enable|disable command as in the screenshot

below. After changing the configuration a power on cycle of the debug probe is nec-

essary in order to use the new configuration. For feature information about how to

use the J-Link Commander, please refer to J-Link Commander (Command line tool)

on page 71.

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