Laurel Electronics
Call (714) 434 6131 for Product Assistance
Panel Meters - Counters - Timers - Transmitters, 4-20 mA & Modbus - Ethernet - USB - RS485 - RS232

USB Interface Board P/N LUSB for Laurel Electronics 1/8 DIN Instruments

USB meter interface board

Key Features

  • Suitable for all 1/8 DIN Laureate DPMs, counters, timers & remote displays.
  • USB Type-B connector for plug-and-play connection to a PC USB port.
  • Allows multiple meters to be connected to a PC via a hub.
  • Data rates selectable up to 9600 baud.
  • Powered by instrument.
  • Isolated from meter and power grounds.

Meter connected to a PC via USBThe Laureate P/N LUSB USB serial communication board allows a Laureate 1/8 DIN digital panel meter, counter or timer to be interfaced to a PC with an available USB port. Connection to a PC allows programming via Laurel's free Windows-based Instrument Setup Software, or to output readings to a PC for display and datalogging. Connecting the USB board to a PC will cause the PC to download the required driver.

A single USB meter is normally connected to a host computer via an off-the-shelf USB cable with A and B connectors like Laurel's cable CBL05. The line can be up to 5.0 m (16.4 ft) long according to the USB standard. The PC driver software will assign a COM port address to the connected device, which is then treated like an RS232 device.

Multipe meters connected to a PC via USB hubs

Multiple USB meters can also be connected to the host computer by using powered hubs, which can branch the original USB line from the computer into multiple lines. Theoretical limits are up to four hubs in series for five tiers of lines, a maximum line length of 5 m per tier (up to 25 m total), and up to 127 devices including the hubs. The PC driver software will assign a unique COM port address (out of an available 256 addresses) to each connected device, which then needs to be addressed as a single device via its unique COM port.

Multiple meters can also be digitally addressed using alternative interface boards: Ethernet board, Ethernet-to-RS485 converter board, USB-to-RS485 converter board, RS485 board with dual RJ11 connectors, and RS485 board with dual RJ45 connectors. A USB board is recommended if the objective is to interface a single meter to a PC with an available USB port.

Laurel's free XLOG2 datalogging software allows virtual meters to be displayed on a computer screen and to be datalogged to disk with no need to write custom software.

Two serial protocols are user slectabel for custom software: Modbus RTU and Custom ASCII. For detailed information on our protocols, please see our communication user manuals.

  • The Modbus RTU protocol is an international standard and allows Laureates to share the same RS485 data line with non-Laurel devices. It supports up to 247 digital addresses. Modbus RTU works in a master-slave (or query-response) mode, and its use requires an external Modbus master, which is typically a PC.
  • Laurel's Custom ASCII protocol is the simpler of the two protocols and uses ASCII strings. It supports up to 31 digital addresses and is recommended if the only devices to be addresssed are Laureate meters. It can be set to a command mode under control of an external master, or to a continuous streaming mode where data is output at specified intervals at rates up to 60 per second.



USB Type A and Type B connectorsThe Laureate LUSB USB 2.0 board provides a USB Type-B connector for plug-and-play connection to the USB port of a PC. It is ideal for use with a PC to program a Laureate meter using Instrument Setup Software. The required USB cable is readily available in computer stores and also from Laurel as cable CBL05.

Meter board with USB Type-B connector Laurel USB cable, P/N CBL05
USB Type-B connector USB cable, P/N CBL05

Laurel Software Requiring a Communications Board

  • Instrument Setup Software runs on a PC and provides a Windows Graphical User Interface (GUI) as an alternative to programming the meter from the front panel. This software can be downloaded from this website at no charge. Its use requires a serial communications board in the meter, but following setup that board can be removed if desired. Compatible with Modbus or Laurel ASCII protocol.
  • Custom Curve Linearizing Software is compatible with the Extended option version of all Laureates. Not applicable to temperature. Custom curve linearization can provide exceptional accuracy from low cost transducers and extend their working range on the high and low ends. This software can be downloaded from this website at no charge. Meter setup requires a serial communications board in the meter and the Laurel ASCII protocol, but following setup that board can be removed if desired and any protocol can be used.
  • Data Logging Software turns a PC into a data logging system. The RS232 board allows data logging with a single meter. Use of RS485 boards allows data logging with up to 31 Laureate instruments. Data can be logged from selected meters into an ASCII file, which can then be imported into MS Excel. Data can also be displayed on the computer screen in the form of up to 64 actual or virtual panel meters in 4 groups (or screens) of up to 16 meters each. Compatible with Laurel ASCII protocol only.

Electrical Specifications

LUSB USB Board Specifications
Data rates 300, 600, 1200, 2400, 4800, 9600, 19200 bps
Connector USB Type-B receptable
Line length, max 5 m
Standards compliance Universal Serial Bus Spec Revision 2.0, Full Speed
Isolation 250V rms working, 2.3 kV rms per 1 min test
ESD Protection 15 kV per IEC 1000-4-2
EMI Immunity 10 V/m per IEC 1000-4-3
EFT Protection 2 kV per IEC 1000-4-4
Short Circuit Protection Continuous
Power to USB Board Via USB connector
Selectable Protocols Modbus RTU, Custom ASCII.

Protocol Specifications (protocols reside on Main Board)

Modbus RTU Protocol
Standards Compliance Modbus over Serial Line Specification V1.0 (2002)
Protocol Type Master-slave, query-response command mode
Data Streaming Mode Not supported by Modbus specification
Data Formats (selectable) 1. No parity, 8 data bits, 2 stop bits
2. Odd parity, 8 data bits, 1 stop bit
3. Even parity, 8 data bits, 1 stop bit
Main Board Revision Level Level 5 or above
Custom ASCII Protocol
Standards Compliance Laurel proprietary protocol
Data Format No parity, 8 data bits, 1 stop bit
Protocol Type Text string based command mode or continuous data streaming mode
Data Streaming Mode User selectable for up to 60 readings/sec
Main Board Revision Level Any
Legal Information
facebook   G+   twitter   linkedin
© 1990-2024 Laurel Electronics