BB2-2010-NB Modbus RTU to LonWorks Gateway

Control Solutions’ Babel Buster® BB2-2010-NB is a Modbus master/slave used to connect LonWorks devices to a Modbus network without binding or LonWorks network management outside of the gateway’s own capabilities.

BB2-2010-NB Functionality

• Connect LonWorks Devices to Modbus Network
• Non-bound Polling of LonWorks Devices
• Modbus RTU Master & Slave
• Up to 300 Network Variables
• Up to 400 Modbus registers
• Universal, fully configurable
• No extra software or drivers to buy
• Free configuration software

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Babel Buster BB2-2010-NB Modbus® RTU RS-485 to LonWorks® Gateway

Order code: BB2-2010-NB
List price: $625.00
Your price: $495.00
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LonWorks to Modbus Data Flow

Control Solutions’ Babel Buster BB2-2010-NB is a Modbus master/slave used to connect LonWorks devices to a Modbus network without binding or LonWorks network management outside of the gateway’s own capabilities. A large number of data objects gives you flexibility in mapping Modbus registers to scalar or structured LonWorks network variables. Multiple registers may be mapped a single structured LonWorks network variable. Modbus holding registers, input registers, discrete inputs, and coils are supported.

The LonWorks network variables will be polled periodically to read LonWorks data, or updated upon change in value (or periodically if chosen) to write LonWorks data. Data read from LonWorks will be placed into Modbus registers. Data written to Modbus registers will be written to LonWorks network variables.

The BB2-2010-NB is most often used as a Modbus slave, providing LonWorks data to a Modbus master such as a control system PLC. The BB2-2010-NB can also be configured as a Modbus master, automatically reading and writing Modbus registers in other Modbus slaves to share LonWorks data.

The BB2-2010-NB provides poll 400 data objects which may be accessed as any of the standard Modbus register types. These 400 registers may be mapped to as many as 300 LonWorks network variables, with multiple Modbus registers often mapped to a single LonWorks network variable.

LonWorks to Modbus Configuration Tool

The Device Manager Configuration Tool is a user friendly LonWorks gateway configuration that runs on your PC. Connect the gateway to your laptop via a USB cable - no need for any adapters or “dongles”, and no need to have a functional network on either side of the gateway for initial setup.

The Device Manager Configuration Tool can import XIF files that define the network variables in the LonWorks device to be connected. The configuration tool also has the ability to import the XIF (program interface) information directly from the LonWorks device in most cases.

The Device Manager Configuration Tool will save your configuration to an XML file as backup, and to replicate the same configuration in additional devices with a simple file download.

The BB2-2010-NB can poll up to 300 LonWorks network variables, each having up to 31 bytes of data. The BB2-2010-NB provides up to 400 Modbus registers which are used to exchange data with the LonWorks network variables.

NV to Modbus Translation Diagram

Many LonWorks network variables are a single data value, such as temperature. However, many other LonWorks network variables are ‘structured’, meaning a single variable contains several related data values such as in the HVAC status variable. Modbus registers, on the other hand, always contain exactly one and only one data value. This means a single structured LonWorks variable cannot be translated to a single Modbus register. The single structured LonWorks network variable must be translated to or from multiple Modbus registers.

The method of making structured LonWorks data available to Modbus involves intermediary data ‘objects’ in the Babel Buster gateway. The LonWorks network variable input data structure is dispersed to multiple data objects. These data objects are, in turn, made accessible as Modbus registers after appropriate data scaling and reformatting. The process is reversed for structured network variable outputs, with multiple data objects (Modbus registers) collected up and formatted into a single LonWorks structured variable.

BB2-2010-NB Connections
BB2-2010-NB Connections


BB2-2010-NB Features

• Read/Write LonWorks Network Variables as Modbus registers
    • 400 Data objects accessible as Modbus registers
    • Access up to 300 Network Variable Inputs
• Supports structured network variables
• Free topology LonWorks network
• No LonWorks network management tools required
• 32-bit ARM co-processor for greater processing power
• Bidirectional LonWorks-Modbus communication
• Supports Modbus “coils”, input registers, holding registers
• 16, 32-bit Modbus registers, signed, unsigned, IEEE 754
• Support for “Mod10” 2, 3, and 4-register data formats
• Modbus (master) polling interval configurable per point
• Operation as Modbus slave also possible, user selectable
• USB connection directly to PC for configuration
• Configuration software provided at no extra charge
• Internal flash card for simplified firmware updates
• Hardened EIA-485 transceiver for Modus RTU
• Modbus RTU baud rates: 1200 to 38400
• Powered by 12-24V DC/AC 50/60 Hz
• Power Consumption: 0.1A @ 24VDC
• DIN rail mounting, 100mm H x 70mm W x 60mm D
• Pluggable screw terminal blocks
• Operating temperature, standard -25°C to +85°C
• Operating temperature, extended -40°C to +85°C
• Humidity 5% to 90%
• FCC, CE Mark, UL 916 Listed


• BB2-2010-NB Data Sheet
• BB2-2010-NB User Guide

• BB2-2010-NB Support Package
Contains configuration tool software, USB driver, documentation. XIF files are generated by the configuration tool.

• Modbus Tutorial
Introduction to Modbus, including function codes, exception codes, register numbering.

• LonWorks Tutorial
Basic overview of LonWorks, and "why is it so complicated?"

BB2-2010-NB Video Library

Watch these videos for an introduction to configuring the gateway. It's easier than reading!

Introduction to LonWorks Modbus Non-Bound Gateway Configuration Tool

BB2-2010-NB Video - Introduction

Configuring Non-Bound LonWorks Gateway from XIF File

BB2-2010-NB Video - Configure from XIF File

Configuring Non-Bound LonWorks Gateway using Discovery from Device

BB2-2010-NB Video - Configure using Discovery from Device

Configuring Non-Bound LonWorks Gateway as Modbus Master

BB2-2010-NB Video - Configure as Modbus Master

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