Logic Outputs

 

An LED control is the typical object that is assigned to a logic output.

The logic outputs can be used to drive indicators or third party devices. For example Logic Outputs can trigger infra-red commands (to control DVD players etc) or power relays to turn other equipment on or off. The logic output can source 10mA, and sink 60mA.

 

• Current source:

This is intended for LEDs. The unit can supply up to 10.5mA at around 5V. An LED can be connected directly without the need for a current limit resistor. When assigning the Control or LED to the port in London Architect, set the control port for normal mode.

 

• Current sink:

This is intended for relays and higher power devices. The unit can sink up to 60mA from an external supply. If more current is driven into the port, the control port automatically decreases its ability to sink current, protecting the circuitry. As there is hysteresis within this circuit, the full sink capability will not return until current is decreased to below 60mA. When assigning the Control or LED to the port in London Architect, set the control port for inverted mode.

 

See Also

Assigning Control Ports

Assignment of Logic Outputs is similar to assigning control inputs.

When assigning this object to the control port, a dialog will ask if you want the action to be:

• Normal (Control or LED in the ON state, causing the logic port to go High, +5v)

or

• Inverted (Control or LED in the ON state, causing the logic port to go Low, 0v).