Turn the rotary switch of the Profitest 204 to the "Card index box" position. Do not press any other key on the test instrument.
Before reading out with PC software, you may have to set the COM interface in the software to which the Profitest 204 is connected.
If a USB adapter is used, the virtual COM interface used is displayed in the Windows device manager under - Ports COM and LPT. If no COM interface is displayed here, the driver for the USB adapter must be installed first.
For the adapter Z501L use the program Drivercontrol for this.
Then start the read-in with the respective software.