SD System Signal SDS-50 Two Wire Irrigation Controller

Designed and manufactured in Australia.

The Signal SDS-50 is a high-performance, Australian-designed Two-Wire irrigation controller built for demanding commercial landscape and agricultural applications. Compact, powerful, and economically priced, the SDS-50 supports up to 48 solenoid valves, 8 programs, and can operate 4 valves simultaneously (including master valve), all from a central location via a simple twisted-pair two-wire path.

Unlike traditional decoder systems, the SDS-50 uses Signal’s patented DataCoil™ technology, which integrates decoder functionality directly into the valve coil, simplifying field wiring and dramatically reducing installation costs.

Designed for intuitive operation and easy servicing, the SDS-50 features modular plug-in components for DIY maintenance, remote programming via the SignalCloud Web Portal, and real-time mobile access using the free SDS-LINK app (available on iOS and Android).

Whether you’re automating a golf course, park, farm, or commercial estate, the SDS-50 provides advanced two-way communication, moisture-based logic, and flexible control options — all in a compact, reliable unit backed by Australian innovation.

FEATURES

• 48 Station Capacity – Operates up to 48 valves via DataValves™ or DataCoils™
• 4 Valves Simultaneous – Run 4 solenoids at once, including master valve
• No Separate Decoders Required – Direct two-wire connection with embedded DataCoil™ decoder coils
• 8 Independent Programs – Program by time, volume (litres), or precipitation (mm)
• Moisture, Flow, and Frost Sensor Integration – Supports up to 8 moisture sensors, 8 water meters, and 2 frost sensors
• 12 Programmable Field DataNodes™ – Sensor and flow input across the two-wire path
• 7 Direct Sensor Inputs – Located on the controller for custom applications
• HydroSector™ Matched Precipitation Programming – Assign flow zones for precise irrigation
• Flow Monitoring & Alerts – Real-time deviation detection with email notifications and auto-shutdown protocols
• Fertigation Support – Assign auxiliary chemical pump and booster pump per program
• DIY-Friendly Design – Modular plug-in boards for fast repairs without specialist tools
• SignalCloud™ Compatible – Remote access via WiFi, Ethernet, 3G/4G or radio modem
• Free Mobile App – SDS-LINK for full site control from your smartphone or tablet
• Includes – Power supply, lightning protection module, PumpNode™, and programming cables

SPECIFICATIONS

• Model: SDS-50
• Stations Supported: 48
• Valve Operation: Up to 4 simultaneously (including master valve)
• Programs: 8 independent programs with 4 start times each
• Run Modes: Time (Hr:Min:Sec), Volume (Litres), Precipitation (mm)
• Calendar Types: 14-day, odd/even, cyclic
• Sensor Inputs:
  • 12 via programmable DataNodes™ (2-wire path)
  • 7 direct on controller terminal
• Moisture Sensor Capacity: 8 (1 per program)
• Frost Sensor Programs: 2
• Flow Monitoring: With deviation detection and alert notifications
• Pump Control:
  • PumpNode™ included for primary pump activation
  • Support for auxiliary and booster pumps per program
• Communication: Two-way, every 3 seconds between all devices
• Connectivity Options: WiFi, Ethernet, 3G/4G, Radio
• SignalCloud Software: Compatible with PC, Mac, smartphone, and tablet
• Dimensions: 179mm (H) x 199mm (W) x 106mm (D)
• Construction: Modular plug-in boards for easy serviceability
• Included Accessories:
  • Plug-in power supply
  • Lightning protection module
  • PumpNode™
  • Two-wire device programming leads