LTR-CEU-1 Single-slot portable crate with interfaces USB 2.0, Ethernet and power supply

Single-slot portable crate with interfaces USB 2.0, Ethernet and power supply
  • Certified galvanically isolated interface device for LTR modules
  • USB 2.0 High Speed & Ethernet interfaces
  • Functionally complete device – it's always LTR-crate + LTR-module
  • A wide product line of LTR modules allows to create specialized external analog-digital devices

LTR-CEU-1-4 is an inexpensive small-size interface module, combined with any I/O LTR-module, which is a functionally complete galvanically isolated device with USB 2.0 High Speed and Ethernet interfaces. The external functional characteristics of the device are determined by the type of the installed LTR module.

The main difference from the previous model LTR-U-1 is the presence of fast USB High Speed interfaces and 100 Mbit/s Ethernet, which allows you to operate with any LTR module without speed limits of data transfer. The maximum data transfer rate is 4 MB/s (500 kS/s input, 500 kS/s output), which is enough for any LTR module to operate at any modes.

Optimal for using in application tasks with a small number of monitored parameters or control signals.

Hardware and software unification of the components of the modular DAQ system allows you to verify the correctness of the task's solution in simple and low-cost LTR versions. This feature simplifies the transition to more complex multi-module LTR versions.


Attention! The minimum software versions that support this device are:

  • lcomp from 16.02.2015 (USB driver)
  • LTRserver or ltrd + LTR Manager 1.3.2.
Type Portable
Maximum number of LTR modules to be installed 1
Power supply External, ~220 V AC adapter included
Supply voltage +12 V (unstabilized in the range from +11 V to +24 V)
Maximum power consumption 8 W
Dimensions (without the projecting parts of the connectors) 135x41x189 mm
Dimensional drawing
Internal architecture

USB 2.0 High Speed

Ethernet 100BASE-TX  (Ethernet physical speed is 100 Mbit/s).
Attention! The 10 Mbps Ethernet mode is not supported.

Maximum data transfer rate 2 MB/s input + 2 MB/s output
Reference generator • Frequency 60 MHz
• Frequency stability ±50 ppm (in operating conditions)
Processor type ARM-controller Cortex M4 LPC4333/43337, 200 MHz
Real-time clock With a removable battery CR2032
Firmware update for ARM-controller, FPGA Yes (performed by the user independently in accordance with the publicly available updates provided by L-CARD)
FPGA type CPLD of MAX II family (no boot requires, no firmware update by user)
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: 0 - 0.5 V
• Logical "1" level: 2.4-3.3 V
(inputs are compatible with the outputs of logic elements with a supply voltage of not more than +3.3 V)

Static parameters of synchronization outputs

• Logical "0" level (without load): 0 - 0.1 V
• Logical "1" level (without load): 3.2-3.4 V
• Operating output current: up to 8 mA

Functions of synchronization inputs-outputs

Similar to the functions of LTR-EU crates' synchronization inputs (2 channels of synchronization marks, the possibility of programmable output control, UART, the ability to connect an external RS-485/422-UART transceiver cable with galvanic isolation)

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.


  • LTR-CEU-1-4
    single-slot portable crate with interfaces USB 2.0, Ethernet and power supply =12V


  • 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_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.


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