In this mode, the 12 control inputs are internally 'pulled up' to +5V DC via a 4.7kOhm resistor. Therefore, no external voltage source is needed to create contact closure to ground (for switches such as mute buttons) or resistance to ground (for other multi-state or continuous controls such as Parameter Presets or faders). Two 'common' ground connections are provided using the 2 'C' pins to the left of the control inputs.
A 47kOhm-log potentiometer (Part no. DM10018) connected between a control input and common will allow parameters to be controlled linearly.
This mode allows the use of linear pots or faders for continuous controls. A pot would be wired as a potential divider with the top of the track connected to the reference output (R), the wiper to a control input and the bottom of the track to the common (C). For good performance pots with track resistance between 10K and 100K are recommended.
3 wire mode can be enabled in the Properties for a compatible hardware device under the Parameters \ General section. It can also be enabled using the Control Port 3-Wire Mode Enabled button on the device's Default Control Panel.