Nota Bene Technology (NBT)

- Model SM300 Series - Master Terminal Unit (MTU)


The SM300 Series MTU (master terminal unit) and RTU (remote terminal unit) are low-cost, stand-alone telemetry hardware used for I/O signal transmission.  Simply install the master and remote units, set DIP switches and power up.  Master (MTU) to Remote (RTU) communication data signals such as cycles, runtimes, minimums, and maximums are transmitted via internal modem over leased lines, radio or spread spectrum connections. This system is compatible with every programmable controller, DCS, or other device that accepts input signals, as well as most commercial software packages. The SM300 Master supports telemetry for 1 or 2 tanks and status and control for up to 8 pumps. Up to 4 Remote RTUs can be connected to the Master.

As your needs change, you can combine the SM300 Series with the more powerful SM800 Series PLC Controller or upgrade to a full SCADA system by adding a PC with operator workstation software.

Typical applications include:

  • Water & Wastewater Systems
  • Sub Stations
  • Lift Stations
  • Tank Farms
  • Irrigation
  • Flow, Level, & Pressure Monitoring
  • Pipeline Monitoring
  • Water Mains
  • Environmental Monitoring

The SM300 Series is compatible with any Modbus capable device or software.For more technical information, see the Master or Slave data sheets.

MTU I/O Features:

  1. Output real time tank levels as 4-20ma which correspond to 4-20ma signals received from the remote site.
  2. Output real time status Digital's which correspond to Digital's received from the remote site.
  3. Accepts control contact inputs which are in turn sent to the remote site for output to the device (i.e. pump).
  4. Communications are automatic. The Master provides notification output if communication failure with remote is detected. If communications fail, remote outputs are held or reset.

  • 8 Digital In
  • 8 Digital Out
  • 2 Analog Out
  • Expansion:Digital In and Out
  • Multiple Protocols available

RTU I/O Features:

  • 1 Analog In, 4 Digital In (Model SM305)
  • 4 Analog In, 1 Digital In (Model SM315)
  • 4 Digital Out (Model SM305)
  • 2 Digital Out (Model SM315)
  • 5A Relay
  • Expansion:Digital In and Out

Low Cost Telemetry

  • Used with PLCs (Programmable Logic Controllers) , Monitoring and Control, End-to-End Telemetry and PC I/O Systems
  • Automatically generates real-time data such as cycle, runtime, minimum and maximum
  • Provides real-time data to remotely monitor equipment problems
  • Expansion board options
  • Used with leased lines, dial in modem or wireless radio connection
  • Enclosures and radios are available options

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