The IQL10 is a terminal unit controller which can be networked using LonWorks (Lon). It can communicate with other IQLs and LonMark devices via the Lon, and with IQ system networked devices via a LINC unit. It has 1 relay output (normally fan on/off), and 4 triac outputs (normally to control valves or dampers). It has 1 variable resistance input which is normally a thermistor temperature sensor.