SM300 Series

Low Cost Telemetry Hardware

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.

See our catalog for available configurations.

Typical applications include:

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

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 

Discontinued Products:

  • SM800 Series Programmable Logic Controllers, Expansion & Accessories
  • XMOD Leased Line Modems & Accessories
  • SR900 & TSR900 Wireless Radios & Accessories
  • Telemetry and SCADA Software
    • NBT Serial Communication DDE Server
    • SM800 Series Programmer
    • SR900 Configuration
    • Reporting Utilities
Product Manuals  and Literature for current and discontinued products can be found HERE.

Contact Us

NBT Nota Bene Technology
19900 County Rd. 81
Maple Grove MN, 55311
P: 763-428-8686
TF: 800-892-5303
F: 763-428-9009


About Us

NBT has been involved in the design and manufacturing of a variety of control and communication related products for over 30 years. NBT operates as a division of EPG Companies Inc. serving primarily the US, Canada and Mexico markets providing controllers, remote telemetry units (RTU’s), modems, switches and other communication products.

EPG specializes in the manufacture of landfill leachate pumps & controls, sump drainers, biogas flares, condensate separators, remediation equipment, telemetry hardware and SCADA systems, and other environmental and industrial products.