The production of Unipi Axon units was discontinued and no longer receive software updates. The Axon line was replaced by the Unipi Patron.

Inputs & Outputs

The following article contains the basic info about inputs and outputs of Axon controllers For detailed info and technical parameters of inputs and outputs, please visit the following subcategories:


The term section is used several times in the articles. For the meaning of this term, please visit this link.

Digital inputs (DI):
Designed to read TRUE / FALSE logic states represented by direct voltage levels (voltage / no voltage). Suitable for reading two-state sensors such as:

  • switches and buttons
  • water level sensors
  • motion sensors
  • window and other contacts
  • auxiliary contactors
  • and other binary sensors and devices

All digital inputs on Unipi Patron, Unipi Neuron, Unipi Axon and Unipi Extension devices feature counter functionality, ie. are equipped with a counter that is able to detect long pulses as well as very short high-frequency pulses.

More detailed info about digital inputs is available on this link.

Digital outputs (DO):
Serve for control of external switching elements such as relays/contactors or SSR relays (silent semiconductor relays with PWM option). Only the power supply negative pole (GND) can be switched by DOs.

Digital outputs on Unipi devices also feature the PWM (Pulse Width Modulation), ie. a discreet modulation for transmitting analog signal using a two-state signal (eg. for dimming LED lighting via SSR relay).

More detailed info about digital outputs is available on on this link.

Relay outputs (RO):
Primarily designed for switching ohmic loads, making ROs suitable for control of lightbulbs, thermoelectric valves, smaller heating elements, small pumps, door locks etc. ROs on Unipi units and extensions are rated for maximum current of 5A at 230 V~ or 30 V⎓.

More detailed info about relay outputs is available on on this link.

Analog inputs (AI):
Analog inputs are used to measure 0-10 V⎓ voltage, 0-20 mA current and resistance (such as PT1000 temperature sensor) and are suitable for collecting data from analog sensors.

Some Unipi units feature two types of AIs:

  • the first type can be used only for measuring current or voltage (Section 1 with the exception of some models, such as the S5xx)
  • the second type additionally supports measurement of 0-2.5 V⎓ voltage and 0-1960Ω or 0–100 kΩ resistance (Sections 2 and 3).

More detailed info about analog inputs is available on this link.

Analog outputs (AO):
AOs serve for control of devices with analog control such as three-way valves, lighting dimmers etc.

Unipi units are equipped with two types of AOs:

  • The first type supports *three output modes: 0-10 V⎓ direct voltage, 0-20 mA current or resistance measurement (section 1)
  • The second type supports only 0-10 V⎓ direct voltage (sections 2 and 3)

* The above-mentioned functions cannot be used simultaneously. Only a single mode can be set: voltage output, current output or resistance measurement

More detailed info about analog outputs is available on this link.