The Novus DigiRail Connect RAMIX 2AI / 2AO / 4DI / 3DO (8811611420) combines 2 isolated universal analogue inputs, 2 isolated analogue outputs, 4 digital inputs and 3 PNP digital outputs in one DIN rail module. The analogue inputs read thermocouples, Pt100/Pt1000, NTC and mV, V or mA signals directly at 16-bit resolution, so sensors wire straight in without separate transmitters. The outputs provide 0-20mA, 4-20mA or 0-10V for drives, valves and displays.
Every DigiRail Connect model has Ethernet, RS485 and Micro USB on board. It works as a Modbus RTU slave on an existing RS485 network or as a Modbus TCP server on Ethernet, and can act as a transparent Modbus TCP to RTU gateway, so an Ethernet PLC or SCADA system can read RS485 instruments wired to its terminals with no register mapping. Configuration and I/O testing use free Novus NXperience software over USB.
Lead time: made to order by Novus, typically 1–2 weeks to dispatch.
DigiRail Connect Range
All four DigiRail Connect models share the same Ethernet/RS485 hardware and software. Choose by the I/O mix you need:
- DMIX 8DI / 8DO (8811612420) — 8 digital inputs, 8 PNP transistor outputs
- DMIX 8DI / 4 Relay (8811612440) — 8 digital inputs, 4 relay outputs
- RAMIX 2AI / 2AO / 4DI / 3DO (8811611420) — this model: 2 universal analogue inputs, 2 analogue outputs, 4 digital inputs, 3 PNP outputs
- RAMIX 2AI / 2AO / 4DI / 2 Relay (8811611440) — as this model but with 2 relay outputs
Only need analogue inputs on RS485? The lower-cost Novus DigiRail-2A converts two thermocouple, Pt100, mV, V or mA signals to Modbus RTU.
✅ 3 Year Manufacturer Warranty — backed by our UK-based technical support
Novus DigiRail Connect Datasheet Download
Novus DigiRail Connect Manual Download
Technical Details
Order code: 8811611420 (DigiRail Connect RAMIX 2AI / 2AO / 4DI / 3DO ETH)
Analogue inputs: 2, isolated, universal: thermocouple J, K, T, N, E, R, S, B; Pt100, Pt1000, NTC; 0-60mV, 0-5V, 0-10V, 0-20mA, 4-20mA. 16-bit resolution
Analogue outputs: 2, isolated, 0-20mA, 4-20mA or 0-10V. 12-bit resolution
Digital inputs: 4, PNP, NPN or dry contact, configurable counter function
Digital outputs: 3, PNP transistor, 200mA max load per output, 6-30 Vdc switching
Communication: Ethernet 10/100 Mb/s (IEEE 802.3u), RS485, Micro USB
Protocols: Modbus TCP server, Modbus RTU slave, transparent Modbus TCP to RTU gateway
Configuration software: Novus NXperience (free, via USB)
Power supply: 10-36 Vdc, 5W max (20mA typical)
Operating conditions: -20 to 60°C, 5-95% RH non-condensing
Enclosure: ABS+PC, 35mm DIN rail mounting
Frequently Asked Questions
What can the analogue inputs read directly?
Thermocouples (J, K, T, N, E, R, S, B), Pt100, Pt1000 and NTC sensors, plus 0-60mV, 0-5V, 0-10V, 0-20mA and 4-20mA signals. Each channel is configured independently in NXperience.
Do I need RAMIX or DMIX?
Choose RAMIX when you need analogue measurement or an analogue output. DMIX models suit applications where every signal is on/off and you need more discrete channels.
Should I choose this 3DO model or the 2 Relay RAMIX?
This model has 3 PNP transistor outputs (up to 200mA) for PLC-level DC signals and pulsing. The 2 Relay version gives volt-free contacts for switching AC loads.
Can it provide a speed reference to an inverter?
Yes. The 0-10V or 4-20mA analogue outputs can set inverter speed, valve position or a remote display, driven from SCADA or a PLC over Modbus.
Industry Applications
- Process monitoring — brings temperatures, pressures and flows into SCADA without separate transmitters.
- Remote analogue control — sends speed references to inverter drives and positions proportional valves.
- Energy & utilities — data acquisition in pump stations and plant rooms over Ethernet or RS485.