The J-Link Patch Adapter allows easy customized wiring between J-Link and targets that do not provide a standard debug connector that fits to any of the adapters available for J-Link (e.g. the Discovery Boards from ST Microelectronics).
It comes with a set of colored jumper wires, allowing easy differentiation of the debug signals. The J-Link Patch Adapter also provides test points for all debug signals to allow easy access to them for checking signal integrity. It has a standard 20-pin 0.1" socket towards the J-Link debug probe and a standard 20-pin 0.1" header on the target side, so it can be plugged-in directly to J-Link, maintaining a 1:1 connection.
For increased flexibility VTref on pin 1 and the target supply voltage on pin 19 can be interrupted by means of two jumpers.