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

The Channel Expansion Module (CEM-AD) is constructed on one printed circuit board, which is mounted into a module chassis. This chassis has the same footprint size as the dataTaker data logger modules.

Note: The dataTaker 50 does not support the Channel Expansion Modules.

The Channel Expansion Module (CEM-AD) printed circuit board comprises

the analog input channels, and relay multiplexers

digital input/output channels

a regulated 5 volt sensor power supply

ground and external reference terminals

A male 25 pin plug for connection to the dataTaker 500/600 series loggers

A female 25 pin socket for connection to other Channel Expansion Modules

All signal input and output connections of the Channel Expansion Module (CEM-AD) are made by screw terminals arranged along the edges. The input and output channel numbers are labelled adjacent to the screw terminals.

Figure 5 illustrates the layout of all terminals and connectors of the Channel Expansion Module (CEM-AD).


The Channel Expansion Module (CEM-AD) 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 Channel Expansion Module can be mounted with the dataTaker data logger 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.

The Large Industrial Enclosure (LIE) will house 1 dataTaker and 1 Channel Expansion Module, and the Small Industrial Cabinet (SIC) will house 1 dataTaker and 2 Channel Expansion Modules.






Figure 5 - Channel Expansion Module (CEM-AD) 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