What is a Data Logger?

A data logger (data recorder) is an electronic device that records data over time and data

logging is the measuring and recording of physical or electrical parameters over a period of


Read : Data Logger in railway Network

           What is Data Logger? 

Data Logger Applications

Data loggers are used in a variety of applications such as in;

  1. vehicle data logging

  2. Environmental monitoring

  3. structural health monitoring

  4.  machine condition monitoring. 

Common measurements include temperature, strain, voltage, current, pressure, force, and acceleration.

Advantage of data loggers

The advantage of data loggers is that they can operate independently of a computer, unlike

many other types of data acquisition devices. 

Data loggers are available in various shapes and sizes. 

The range includes simple economical single channel fixed function loggers to more powerful programmable devices capable of handling hundreds of inputs.

Datalogger Communication

There are totally 9 communication ports available for connecting different equipment to the data


• Single Data logger to a computer for running NMDL software for through a 9- pin male d-

connector(serial communication).

• The communication port 2 & 3 are used to connect networking the data logger switch each

other through a 25-pin female d-connector.

• The communication port 6,7, 8 & 9 are used for 20ma current loop communication through

9-pinmale d-connectors.

• A printer can be connected to data logger through a 25-pin female d - connector to have a

hard copy of all the events occurred.

• Two sets of controls are provided for connecting tele controls to the data loggers with the

help of 25-pin female d –connectors.

• The data loggers are interlined with the help of modems through two 9-pin male d-


NMDL software

 To get on line information sent by individual data loggers placed at different stations of the network and to effectively manage the communication between the networked data loggers.

Purpose of NMDL

1. To receive data from Data Logger network.

2. To process the Data Logger wise data in sequence for

a. Real Time Mimic of Station Layout

b. Real Time Signaling System failure alarms

c. To avail Remote monitor & control of assets like Data Loggers

d. Relay Huts

e. Modems

f. To Log Data Logger wise data in Data Base.

g. To analyze the unusual occurrences, for appropriate decision making.

Network Monitoring Features

A. Status display of Sub Systems and Failure Details.

1. Modem Link Status

2. Healthiness of data flow in each direction

3. Data Logger / Relay Hut status

4. FEP Status

5. CMU and Server status

6. LAN Status

B. Restoration of Network Failures from Central Location.

1. Modem Reset

2. Data Logger / RTU Time Setting

3. Getting old data from data logger to central location

4. Blocking of redundant data after restoration of data path after failure

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