Chapter 2 System Components Connecting an Output Signal to a Sinking Input In this configuration, you need to connect an external pull-up resistor. Since your HAWK MV-4000 output signals can sink up to 50 mA, use the documentation of your sinking device to calculate the required resistance for your external pull-up resistor (if necessary). Using this method with a pull-up resistor will allow you to connect to up three sinking inputs. (Equivalent circuit only.) 2-24 HAWK MV-4000 Smart Camera Guide