J-Link Usb Identification; Connecting To Different J-Links Connected To The Same Host Pc Via Usb - Segger J-Link Series User Manual

4.6

J-Link USB identification

In general, when using USB, there are two ways in which a J-Link can be identified:
• By serial number
• By USB address
Default configuration of J-Link is: Identification by serial number. Identification via
USB address is used for compatibility and not recommended.
Background information
"USB address" really means changing the USB-Product Id (PID).
The following table shows how J-Links enumerate in the different identification
modes.
Identification
Serial number (default)
USB address 0 (Deprecated)
USB address 1 (Deprecated)
USB address 2 (Deprecated)
USB address 3 (Deprecated)
Table 4.1: J-Link enumeration in different identification modes
4.6.1 Connecting to different J-Links connected to the same
host PC via USB
In general, when having multiple J-Links connected to the same PC, the J-Link to
connect to is explicitly selected by its serial number. Most software/debuggers pro-
vide an extra field to type-in the serial number of the J-Link to connect to:
The following screenshot shows the connection dialog of the J-Flash software:
J-Link / J-Trace (UM08001)
PID
Serial number is real serial number of the
0x0101
J-Link or user assigned.
0x0101 123456
0x0102 123456
0x0103 123456
0x0104 123456
© 2004-2012 SEGGER Microcontroller GmbH & Co. KG
Serial number
91