RUT204 CAN Bus Router for Wastewater Substation Monitoring Leave a comment

Most industrial infrastructure sits in plain sight. Pumping stations do not. They run continuously, without staff, often in locations with no wired internet and no fixed telemetry. When a pump develops a fault, the first sign is frequently an overflow event or a complaint. When the backup generator fails during a power outage, operators often discover this only when a site inspection is triggered by something else going wrong.

The Teltonika RUT204 addresses this directly. It is the first router in the Teltonika RUT range to include integrated CAN hardware, meaning it can connect directly to variable speed drives, generator controllers, and other CAN-based industrial equipment over 4G LTE without requiring an external gateway device. This post explains how the RUT204 works in a wastewater substation context and outlines other applications where the same combination of interfaces is valuable.

The Problem with Remote Wastewater Substations

A typical wastewater pumping station contains a submersible pump driven by a variable speed drive (VSD), a control PLC for pump logic and tank level management, and a backup diesel generator for power outage scenarios. The station runs 24 hours a day. It has no permanent staff.

Without remote connectivity, operators rely on scheduled site visits and reactive call-outs. A pump running at reduced efficiency, drawing elevated current, or generating fault codes goes unnoticed until it stops. A generator that has run out of fuel or developed a fault gives no warning until a power cut exposes it. Neither situation is acceptable in a network with regulatory obligations around overflow events.

Fibre or fixed broadband is not available at most rural substation sites. The only reliable option for real-time remote monitoring is cellular connectivity, with an industrial router that can interface directly with the equipment already installed on site.

How the RUT204 Connects a Wastewater Substation

The RUT204 provides 4G LTE Cat 4 connectivity at up to 150 Mbps download and 50 Mbps upload, with 3G and 2G fallback where needed. More importantly for this application, it carries an integrated CAN interface on the same 6-pin terminal block as the RS232 port. No external CAN-to-IP converter is required.

Connection to the Variable Speed Drive

Modern variable speed drives used in wastewater pumping stations commonly expose a CAN port for monitoring and control. The RUT204 connects to the VSD CAN port directly via the 6-pin terminal block (CAN H on pin 4, CAN L on pin 6). The current live firmware feature is CAN Gateway, which forwards raw CAN frames over IP across the 4G link to a SCADA platform or cloud-based monitoring system. Operators can access motor speed, load, current consumption, operating hours, and fault status remotely in real time.

CANopen Client support is listed on Teltonika’s firmware roadmap and is not yet live in the current RutOS release. Check the Teltonika RMS and RutOS release notes, or contact the routerstore.com team on 0300 124 6181, for current firmware status before specifying the RUT204 where CANopen object-level parsing is a requirement at the point of commissioning.

Connection to the Control PLC

PLCs handling pump logic and tank level control connect to the RUT204 via Ethernet using Modbus TCP for modern controllers. Legacy controllers using RS232 connect via the serial interface on the same 6-pin terminal block using Modbus RTU. Both paths give operators remote access to automation status, setpoints, and system alarms from a single device.

Second RUT204 at the Backup Generator

A second RUT204 deployed at the backup diesel generator connects to the generator controller via CAN. The router reads engine status, RPM, fuel level, battery voltage, operating hours, and active fault codes. Operators know continuously whether backup power is available, not just when a power cut forces a test. Maintenance can be planned based on actual runtime hours rather than calendar intervals.

Both routers transmit data to a SCADA system or cloud platform over 4G. The dual SIM slots on the RUT204 provide automatic network failover if a primary SIM carrier loses signal at the site. The 9-57 VDC power input covers both 12 V and 24 V installation environments without a separate DC converter, and the -40 to +75°C operating range handles outdoor enclosure conditions across all UK seasons.

Remote Management with Teltonika RMS

Both RUT204 units are managed through Teltonika RMS, the cloud-based remote management platform that operates across all Teltonika RutOS devices. RMS provides zero-touch provisioning, meaning routers can be pre-configured and dispatched to site without requiring an engineer to attend commissioning. The device registers to RMS automatically when it connects to the network.

From the RMS dashboard, operators can view the status of all connected devices across a wastewater network from a single interface. Remote configuration changes, firmware updates, and diagnostic access are all handled without a site visit. For a network operator managing tens or hundreds of substations, this reduces operational cost substantially compared to reactive call-out models.

The Wi-Fi interface on the RUT204 provides local network access for attending engineers during maintenance visits, allowing diagnostics and configuration without cellular dependency.

Antenna Selection for Substation Enclosures

The RUT204 ships with two SMA stub antennas for the mobile connection and one RP-SMA stub for Wi-Fi. In open environments with reasonable signal these perform adequately. Inside a metal distribution enclosure, stub antennas are significantly less effective. The metal cabinet attenuates signal and the antenna is usually positioned low down near cable entry points.

For enclosure installations, external antennas mounted on the outside of the cabinet on short, low-loss cable runs consistently outperform internal stub antennas. The routerstore.com 4G antenna range includes omni-directional and panel options suitable for pole-mounting, wall-mounting, or DIN rail enclosure attachment. Where signal is marginal at a rural site, a directional antenna pointed at the nearest cell tower is worth considering before investing in signal repeaters.

Other Applications for the Teltonika RUT204

The combination of CAN bus, RS232, GNSS, dual SIM, and 4G in a single compact unit at under 3.5 W maximum consumption makes the RUT204 practical for a range of applications beyond wastewater substations.

Vehicle Fleet Telematics and Diagnostics

The RUT204 connects directly to a vehicle’s CAN bus via the terminal block. CAN frames are forwarded to a fleet management platform over 4G without an external converter. The integrated GNSS (GPS, GLONASS, BeiDou, Galileo, QZSS) provides real-time position alongside CAN payload data. The 9-57 VDC power input covers 12 V and 24 V vehicle electrical systems. The -40 to +75°C operating range handles underbonnet and cab environments. Geofencing zones configured in RutOS can trigger SMS or RMS alerts when a vehicle leaves a defined area.

Industrial Machine Monitoring

Packaging machinery, agricultural equipment, and construction plant using CAN-based controllers can be monitored remotely without modifying existing CAN wiring. Legacy serial equipment on the same installation connects via RS232. The internal Micro SD slot (up to 2 TB) buffers data locally during connectivity gaps and pushes it to the server when the link recovers. This matters on rural sites where 4G coverage can be intermittent.

Energy and Utilities – Smart Meter and Grid Edge

Smart meters and grid edge devices using DLMS/COSEM or DNP3 connect via RS232 or Ethernet. The RUT204 supports both protocols natively in RutOS. The wide voltage input suits solar charge controller outputs and battery-backed distribution boards without a separate DC converter. Power consumption below 3.5 W minimises draw on constrained energy budgets at off-grid installations.

Smart City and Transport Infrastructure

Traffic management controllers, bus telemetry systems, and roadside monitoring units all benefit from the CAN, GNSS, and 4G combination in a compact unit. Dual SIM failover maintains connectivity where a primary network operator has patchy coverage at a specific street location. RMS provides centralised management of a distributed estate without site-by-site visits.

Solar-Backed Remote Monitoring Enclosures

The sub-3.5 W maximum consumption makes the RUT204 practical for solar-backed monitoring enclosures where power budget is constrained. Modbus TCP or RTU connects sensors and PLCs. MQTT or Data to Server pushes readings to Azure IoT Hub or AWS IoT Core. For inbound remote access, a fixed IP SIM removes the carrier-grade NAT constraint and allows direct VPN connection to the device without port forwarding.

RUT204 Key Specifications at a Glance

Buy the Teltonika RUT204 from Routerstore.com

The Teltonika RUT204 is available from routerstore.com with UK-based technical support. As a Teltonika Diamond Partner with over 25 years in business telecoms, Millbeck Communications can advise on the right router, SIM, and antenna configuration for your specific site requirements.

For wastewater, utilities, or any CAN-based industrial monitoring project, call the team on 0300 124 6181 or email sales@routerstore.com. We can supply the RUT204, compatible fixed IP SIM cards, external 4G antennas, and Teltonika RMS credits as a complete package.

See the full Teltonika 4G router range or browse the explainers section for further technical guidance on industrial cellular connectivity.