Connecting one or more buttons - SmartRelay 3 system

As a general rule, buttons are always connected to the digital inputs on the controller. Up to three buttons can be connected per controller (see Controller). Button functions can be configured in LSM. The inputs are low in a non-actuated state, i.e. logic 0. They are registered as high if the voltage present exceeds a threshold value (see Properties). The threshold voltage can be exceeded (as shown) by connecting to the controller's operating voltage. Alternatively, any voltage within the specified levels (see Properties) can be used with a common reference potential to the controller.

Option 1: Using the I+ connection

In addition to the digital inputs, there is also an output which transmits an operating voltage of - 1 V_DC to make it easier to use buttons. The output can be used to increase the inputs to a higher voltage than the threshold voltage, thus switching to logic 1.

Option 2: Using V_IN

If I+ is not to be used, another voltage can be used with a common reference potential (same earth) with the controller – from the power supply unit in this case. This option is recommended if the power supply unit and buttons are close to one another, but are far from the controller. There is no need to install another cable (the I+ to be precise) in this case.