dataTaker - Data Loggers, Powerful and Flexible Data Acquisition & Data Logging Systems

The dataTaker 50 is constructed on two printed circuit boards, which are mounted into a modular chassis.

The Processor printed circuit board is located in the bottom of the dataTaker 50 chassis. The Processor printed circuit board comprises the

microcomputer, system logic and system timing circuitry

system software in ROM memory

system and data storage RAM memory, and interface for memory cards

analog to digital converter circuitry

The Signal I/O printed circuit board is located under the top cover of the chassis, and provides all of the interfacing to the logger on its surface. The Signal I/O printed circuit board comprises the

the RS232 COMMS serial interface

the analog input channels, and multiplexer

digital input/output channels

high speed counter channels

power supply, and battery charger for a lead acid gel cell battery

12 pin connector for a connecting a Panel Mount Display module to the logger

a regulated 5 Volt sensor power supply

ground and external reference terminals

the Wake terminal for externally waking the dataTaker 50 from low power or sleep mode

An 8 way DIP switch is also located on the Signal I/O printed circuit board, beside the memory card socket. The DIP switch provides for

setting the baud rate for the RS232 COMMS serial interface

setting an address for the logger

setting the local mains frequency

The top cover of the dataTaker 50 must be removed to access this DIP switch.

The function block diagram for the dataTaker 50 is illustrated in Figure 1, which also indicates on which of the printed circuit boards the various sub systems reside.

All signal input and output connections to the dataTaker 50 are made via removable screw terminals (Series 3) or fixed screw terminals (Series 1 and 2) that are arranged on the upper surface of the data logger. The input and output channel numbers are labelled adjacent to the screw terminals.

The RS232 COMMS serial interface is implemented as a female 9 pin D type connector, located along the upper edge of the data logger.

Screw terminals for the external power supply connection and the battery connection are also located along the upper edge of the logger.

Figure 2 illustrates the layout of all terminals and connectors for the dataTaker 50.


The dataTaker 50 has a solid state multiplexer for selecting analog input channels. The multiplexer uses CMOS 4052 quad analog gate devices.

The 4052 devices have a maximum input voltage of approximately 15 Volts, and will withstand a common mode voltage of up to ±3 Volts.

The multiplexer devices also provide input protection for the dataTaker 50 against excessive input voltages, because the 4052 devices will generally fuse to open circuit when damaged. These devices are socketed for easy replacement.

The dataTaker 50 data logger has three decade voltage input ranges of ±25.000 mV,  ±250.00mV and  ±2500.0 mV.


The dataTaker 50 is normally supplied in the basic format as a free standing module, and can be used in this format in work rooms, laboratories and other clean areas.

Alternatively the dataTaker 50 can be mounted into enclosures to suit the particular application, eg. heavy duty industrial enclosures, weatherproof enclosures, portable carry cases, etc.

A variety of enclosures are available from your dataTaker supplier, for industrial, weatherproof and portable applications.







Figure 1 ñ dataTaker 50 Function Block Diagram







Figure 2 ñ dataTaker 50 Screw Terminal and Connector Layout.

Page Content


Title and Waranty

Go to: Section 2 | Section 3

Section 1

Construction of the dataTaker 50

Construction of the dataTaker 500 600

Construction of the CEM

Getting Started


Section 2


Powering the dataTaker

Powering Sensors from the dataTaker

The Serial Interfaces

The RS232 COMMS Serial Interface

The NETWORK Interface

Analog Process

Connect Analog

Analog Chns

Measuring Low Level Voltages

Measuring High Level Voltages

Measuring Currents

Measuring 4-20mA Current Loops

Measuring Resistance

Measuring Frequency and Period

Measuring Analog Logic State

Measuring Temperature

Measuring Temperature with Thermocouples

Measuring Temperature with RTDs

Measuring Temperature with IC Temperature Sensors

Measuring Temperature with Thermistors

Measuring Bridges and Strain Gauges

Measuring Vibrating Wire Strain Gauges

The Digital Input Channels

Monitoring Digital State

The Low Speed Counters

The Phase Encoder Counter

The High Speed Counters

The Digital Output Channels

The Channel Expansion Module

Installing The Panel Mount Display


Section 3

Programming the dataTaker

Communication Protocols and Commands

Entering Commands and Programs

Format of Returned Data

Specifying Channels

The Analog Input Channels

The Digital Input Channels

The Counter Channels

The Digital Output Channels

The Real Time Clock

The Internal Channels

Channel Options



Scaling Data - Polynomials, Spans and Functions

CVs Calcs and Histogram

Logging Data to Memory

Programming from Memory Cards


Switches and Parameters


Writing Programs

Keypad and Display

Error Mess Text

Appendix A - ASCII

Appendix B - ADC Timing