LTR-EU-8 8-slot crate with interfaces USB 2.0, Ethernet and power supply

8-slot crate with interfaces USB 2.0, Ethernet and power supply
  • Certified configurable I/O device
  • Ethernet interface provides remote data acquisition
  • USB interface provides convenience for short-distance connection to a computer
  • Ability to operate in autonomous mode and to program the signal processor

Workstation with 16 slots for galvanically isolated LTR-modules, with two interfaces USB 2.0 (high-speed) and Fast Ethernet (100BASE-TX) and the synchronization interface.

Multifunctionality of LTR-EU-8 provides two interface connections and multiple configurations of the installed LTR-modules.

Ethernet interface allows you to enter data at any distance from the operator's computer and eliminates the need of additional remote computers. The ready-made remote data acquisition software significantly reduces the complexity of tasks implementing.

The additional feature of autonomous operation of the device and low-level programming of built-in signal processor Blackfin ADSP-BF537 expands the functionality and allows LTR-EU-8 to be used as stand-alone controllers in dynamic tasks with rigid time feedback.

Type Desktop
Maximum number of LTR modules to be installed 8
Dimensions 236x133x378 mm (without the projecting parts of the connectors, without handle)
Dimensional drawings (all dimensions in millimeters)
Front view
View from above

View from above

LTR-EU-8-2, LTR-EU-8-3

Left view (positions of fixing the handle)
Back view LTR-EU-8-1

Back view 



Note: The back view of LTR-EU-8-3 is similar to LTR-EU-8-2 with accuracy to marking.
Power supply
Supply voltage of the crate ~220 V for LTR-EU-8-1 
~220 V/=12 V for LTR-EU-8-2 
~220 V/=27 V for LTR-EU-8-3
Maximum power consumption 80 W
Internal architecture
Interfaces USB 2.0 High Speed 
Fast Ethernet (100BASE-TX)
Maximum data transfer rate 16 MB/s (via USB 2.0 High Speed)
10 MB/s (via Ethernet)
Reference generator Frequency of 60 MHz, long-term frequency stability ±50 ppm under operating conditions
Processor type Signal processor Blackfin ADSP-BF537
Firmware update for bootable flash memory, FPGA Yes
Additional possibility of low-level programming Provided by the user, it is possible to connect the JTAG emulator
FPGA type EP1С30 (firmware update by user)
Flash-memory Non-removable 2 GB (option)
Galvanic isolation of the crate Isolation between the crate ground terminal and the contacts of module connectors up to 820 V (AC voltage of sinusoidal form with frequency of 50 Hz and average square value of 820 V for 1 min).
Galvanic isolation of Ethernet 1500 V  (50 Hz, 1 min)
External synchronization
Number of synchronization inputs 2
Number of synchronization outputs 2
Static parameters of synchronization inputs

• Logical "0" level is no more than 0.5 V
• Logical "1" level is not less than 2.4 V

(TTL-compatible inputs)

Parameters of synchronization outputs Correspond to CMOS/LVTTL logic with +3.3 V supply voltage (TTL-compatible outputs)

Sync connector

The circuits of the synchronization connector are not galvanically isolated. For a description of the signals, see the User's Guide.

For organization of galvanically isolated LTR-EU crate's interface, as well as the RS-485/422 interface, a RS-485/422-UART transceiver cable with galvanic isolation can be applied.


  • ltrapi_en.pdf (filesize: 604 618 bytes, date: 15.02.2018)

    Ltrapi basic library. Programmer's Guide.

  • ltr_cross_sdk_en.pdf (filesize: 551 553 bytes, date: 13.02.2018)

    Description of the software for Windows, Linux, FreeBSD and QNX.

  • ltr_en.pdf (filesize: 11 066 427 bytes, date: 25.12.2017)

    LTR modular DAQ system. User's Guide (revision 3.1.0).

    • General characteristics and principles of construction
    • Working with LTR crate
    • Overview of LTR crate architecture
    • LTR11 ADC module
    • LTR212 (M) strain measurements modules
    • LTR27 measuring module
    • LTR41, LTR42, LTR43 digital I/O and synchronization modules
    • LTR51 frequency meter module
    • LTR22 ADC module
    • LTR24 (-1, -2) ADC modules
    • LTR25 ADC module
    • LTR34 DAC module
    • LTR35 DAC module
    • LTR114 ADC module
    • LTR210 ADC module
    • LTR00 Dummy module
    • Low-level programming of LTR-EU crate
    • Specification
  • ltr_soft_getting_started_en.pdf (filesize: 269 974 bytes, date: 13.02.2018)

    Starting to work with DAQ system LTR. Questions about the software.

LGraph2 software package

  • (filesize: 26 786 707 bytes, date: 11.10.2021)

    LGraph2 is a free multi-channel data recorder for Windows. Version 2.35.20 provides the possibility of simultaneous data visualization and recording from the ADCs: L-502, L-780M, L-783, L-791, E-502, E14-140, E14-140M, E14-440, E-154, E20-10, LTR11, LTR114, LTR27, LTR212, LTR216, LTR22, LTR24, LTR25, LTR51. It requires an updated version of the LComp driver (from version 01.04.2010) and ltrserver (no lower than

Software for Windows

  • lcard-opc-setup.exe (filesize: 12 440 520 bytes, date: 09.04.2019)

    OPC DA Server for L Card data acquisition modules and LTR crate system. Version 1.0.10.

  • lcomp.exe (filesize: 6 342 216 bytes, date: 12.05.2021)

    Beta version. LCOMP library for Windows XP/Vista/Win7/Win8/Win10 32 and 64-bit versions with drivers. The installer and drivers are digitally signed. The library is built on the basis of modern WDM-drivers rewritten on WDF. It includes the WDM driver itself for L-CARD hardware, the DLL library with source code, programming examples, electronic description, etc. The LCOMP library provides support for almost the entire range of products: PCI boards, USB modules. ISA support is excluded.

    The library includes “L-Graph I” software. L-Graph I supports the following devices: L-1450, L-761, L-780, L-783, L-791, E14-140, E-154 and E14-440. Files recorded by L-Graph I can also be read and processed using the demo-version of PowerGraph v.3.X.

  • ltrd-setup.exe (filesize: 1 467 408 bytes, date: 19.08.2021)

    The ltrd service. Version Provides communication with LTR crates. It is a replacement for the LTRserver software while maintaining the compatibility of the program interface. ltrd is designed for the same purpose as LTRserver, but it is a service that runs when the system is started. The graphical interface to the service is provided by a separate LTR Manager program.

    Attention! Only one of the programs ltrd or LTRserver can work at a time.

  • ltrdll.exe (filesize: 1 328 600 bytes, date: 30.11.2021)

    Libraries for working with LTR crates and modules. Version 1.32.30.

  • ltrmanager_setup.exe (filesize: 9 751 808 bytes, date: 04.05.2021)

    LTR Manager software. Version 1.5.2. Graphical interface to the ltrd service. Provides an interface similar to the LTRserver interface when working through the ltrd service.

Firmware and BIOS


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