c-pod Options

‍There are a couple of options in c-pod that you can change: the output logic and options that are specific to the “Analog c-pod” model.

‍About Output Logic

‍c-pod can deliver output signals using either positive logic or negative logic. For all models except the Analog c-pod:

With positive logic, output is 0 volt by default and rises to +5 volts when sending a pulse or event marker.
With negative logic, output is +5 volts by default and drops to 0 volt when sending a pulse.

‍Most EEG systems and data recorders use positive logic. The exceptions we are aware of are:

Magstim EGI using Net Station version 5 or later. All “c-pod for EGI” units shipped after April 13, 2022 are preconfigured for negative logic output.
TMSi SAGA amplifiers use negative logic but other TMSi models use positive logic. If you are using a SAGA, follow the instructions below to change the output logic.

‍For Analog c-pod, the general idea is the same. With positive logic, output is 0 volt by default and rises till it reaches the maximum voltage. With negative logic, output is the maximum voltage and drops till it reaches 0 volt.

‍Changing the Output Logic

Download Xidon 2 and install it. You need the version released on April 13, 2022 or later.
Run Xidon.
Click on the Search for Device button.
When Xidon finds your c-pod, it will display a picture on the left hand side. It will also show the firmware version. This needs to be version 2.2.7 or later.
If your firmware is older than version 2.2.7, you need to update the firmware first.
In Xidon, click on the Device menu and choose c-pod Options; a dialog appears.
Change the output logic and click on OK.

‍You only need to do this once; the setting will be updated and stored in flash memory.