EOTec 2000 Multi-channel analog/digital multiplexer *Legacy

EOTec 2000 Multi-channel analog/digital multiplexer *Legacy Request A Quote

This model has been updated and replaced with the new MX Series Multiplexers, which now carry a variety of certifications and should be used in new applications. The EOTec 2000 line is still available should you need replacement parts for existing installations. Please contact us to purchase, or if you have any questions.


NSPI manufactures modules for 4-20mA, 0-10V, RS-232 and contact closure applications. The base unit (or brain) connects to the fiber optic cable and provides visual indication of fiber link status. Information is received from up to four input modules that can be cascaded. Each module has a partner module installed on the corresponding base unit. An integrated backplane allows for communications between modules with no external inter-modular connection. Installation and commissioning is fast and simple — no programming is required.

Power supply options:

The base unit and all its connected input/output modules can receive power from the standard EOTec 2000 power supplies (120/240VAC, 125VDC or 24VDC) or from an external 24VDC power supply connected directly to the base unit through a pluggable screw terminal connection.

Typical applications:

Typical applications include remote analog data transmission over long distances, smoke stack emissions monitoring instrumentation, windmills (wind turbines) and extensions of DCS or PLC systems. Each base unit has a duplex optical port for use with multi-mode or single mode optical fiber with transmissions at 1300 nm using industrialized ST/SMA connectors.


  • Up to 8 analog or digital signals over a pair of fiber optic cables
  • Bi-directional communications
  • Configurable with multi-mode or single mode optical fiber
  • Pluggable screw terminals for all wire connections
  • Visible status LED’s for power, TX/RX and channel inputs
  • Available with dual redundant, hot swappable power supplies
  • Designed for mounting on standard 35 mm DIN-Rail
  • Operating temperature range of –40 °C to 85 °C, 0-90% RH (non-condensing)
  • Dimensions (each module): 22.5 mm (0.9”) w x 99 mm (3.9”)h x 114 mm (4.5”) d

Selection guide:

Base units:

Model Description Optical Dynamic Range Optical mode Optical connector Optical fiber size
2M55 Multiplexer, base unit, 1300nm 13dB MM ST 50-100 µm
2M57 Multiplexer, base unit,  1300nm 13dB MM SC 50-100 µm
2M59 Multiplexer, base unit,  1300nm 11dB SM SC 5-10 µm
2M61 Multiplexer, base unit,  1300nm 29dB SM SC 5-10 µm


Input/Output Modules:

Model Description Analog Signal Wavelength
2M11 2-CH Input Module 0-10VDC N/A
2M21 2-CH Output Module 0-10VDC N/A
2M12 2-CH Input Module 4-20mA N/A
2M22 2-CH Output Module 4-20mA N/A
2M13 2-CH Input Module Dry Contact N/A
2M23 2-CH Output Module Form C Relay N/A
2M30 2-CH Bi-directional Module RS-232/485 9.6K – 115K

Multiplexer Power Supply Options:



2A06  Power Supply, 85 to 240VAC, 50/60Hz, or 85 to 140VDC
2A16  Power Supply, 85 to 240VAC, 50/60Hz, or 85 to 140VDC, w/ diagnostics
2A08  Power Supply, 24VDC
2A18  Power Supply, 24VDC, w/ diagnostics

Application Diagram: