Register Matrix | LabJack
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Datasheets and User Guides

App Notes

Software & Driver

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Register Matrix

After selecting devices, a tab named "Register Matrix" is available. It allows you to search for, read, and write all single-value numeric registers for the currently selected device. The Modbus Map is a similar online tool for looking up register descriptions.

Key Features

  • Reading and writing all registers


Register Matrix

The following image shows the default view of the Register Matrix.

LabJack USB/Ethernet/WiFi DAQ Device Control Program Register Matrix

Finding a Register

A few quick tips for finding the register or registers you need to write or read:

  • Go the applicable section of the T-series Datasheet to find registers related to particular functionality.
  • Use the "Filter by Tags" on the Register Matrix to narrow the list.
  • If you have some idea of the name of the register, start typing in the Search box on the Register Matrix to see matching registers.


This example reads and sets a T-series' analog output.  Since DAC0 is the name of the register that controls the first analog output, we type "DAC0" in the Search box.  (We could also update DAC0 using the Dashboard tab.)

LabJack USB/Ethernet/WiFi DAQ Device Control Program Register Matrix, Searching for Register

Reading DAC0

Clicking the Selected button moves DAC0 into the Active Registers area and it immediately starts reading the current value of this register.

DAC0 is a readable & writable (RW) register.  For information about a register, click on the information button (small i with circle around it).

LabJack USB/Ethernet/WiFi DAQ Device Control Program Register Matrix, Reading a Register

Writing DAC0

To write a new value to DAC0, click the pencil symbol next to it in the Active Registers area, type in the new value, and then click the arrow to send it.  Click the X to exit write mode and start reading again.

LabJack USB/Ethernet/WiFi DAQ Device Control Program Register Matrix, writing to a register

Supported Devices

Additional Examples

Additional examples for how to use the Register Matrix are in the Subsections below.