The IQ41x series of intelligent controllers are designed for use as unitary controllers in building control systems. Full compatibility with other Trend IQ controllers enables the IQ41x to integrate the local environmental needs with the bulk air conditioning system in order to optimise both comfort and running costs. The controllers have 5 inputs and 6 outputs. The IQ411 has 6 solid state digital outputs, and the IQ412 has 4 solid state digital outputs and two 0 to 10 V outputs. The IQ41x series use Ethernet and TCP/IP networking technologies with embedded XML. Trend current loop Lan, and BACnet over IP communications are available as options.