AIO-844 provides 4 Analog Input (AI) ports and 4 Analog Output (AO) ports. Each AI port can measure 0 ~ 20 mA or 4 ~ 20mA currents. Each AO port can deliver 0 ~ 20mA to the output. AI port is used to interface with 3rd party sensors/detectors: (1) Temperature and Humidity, (2) Flame proof H2 gas detector, (3) Flame proof O2 gas detector, (4) Flame proof CO gas detector, etc. AO port is used to control devices that can take the AO as input. 

AIO-844 can transmit/receive the data values using (1) MQTT/WiFi, (2) WiFi and (3) LoRa techniques. Method (1) sends/receives MQTT messages to the remote MQTT broker directly. Methods (2) requires MQTT server and method (3) requires LoRa MQTT Gateway to relay the received/transmitted messages to the MQTT Server. Messages processed in the MQTT Server can be displayed in the remote PC monitor via a private VPN link.