The State101A is a compact, state data logger. Includes declaration of conformance. Read More >

Key Features:

  • Compact Size
  • 10-Year Battery Life
  • Memory Capacity of 400,000+ Readings



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The State101A is a compact, state data logger that monitors and records the occurrence, duration, and status of predetermined events by measuring changes in voltage.

With a user-programmable reading rate of up to 4 Hz, 10-year battery life and the ability to store up to 838,041 readings, the State101A is ideal for long-term studies. Typically connected to a relay or switch, this device features a removable screw terminal block to easily disconnect and retrieve the logger for data download without disrupting wiring connectivity.

The State101A is compatible with the latest MadgeTech 4 Software making starting, stopping, and downloading simple and easy. Graphical, tabular, and summary data is provided for analysis and can be viewed as customizable engineering units.


Memory465,578 readings
Reading Rate4 Hz to 1 every 24 hours
Baud Rate115,200
LED IndicatorsRed and Green
Battery Life10 years typical, dependent upon frequency and duty cycle
Dimensions1.4 in x 2.1 in x 0.6 in (35 mm x 54 mm x 15 mm)
Operating Environment-40 °C to +80 °C (-40 °F to +176 °F), 0 %RH to 95 %RH non-condensing
Required Interface PackageIFC200


State Input Range0 to 30 V
State Input Low<0.4 V
State Input High>2.8 V
State Internal Weak Pull-up<60 μA
State Input Impedance60000 Ω
State Resolution4 Hz (reading rate selectable in software)


State101A Specification Sheet

State101A Product User Guide

State/Event/Pulse Application Note

Support Videos

State101A | Changing the Battery

State101A | The Difference Between Event, State & Pulse


Part Numbers

State101A — 901571-00


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