BASgatewayLX
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data BASgatewayLX — Modbus to BACnet® Converter Modbus remains a popular network interface. It is commonly found on jobs such as boiler control, variable speed drives, and metering applications, but these devices lack BACnet compliance. To make Modbus devices appear as individual BACnet devices a BASgatewayLX is used. This device has one 10/100 Mbps Modbus TCP or BACnet/IP Ethernet port and an opto-isolated Modbus EIA-485 serial port for Modbus RTU or Modbus ASCII devices. Up to 30 Modbus serial devices (represented by up to 1000 polled points) can share the single Modbus port on the BASgatewayLX. The virtual routing feature in the BASgatewayLX allows each connected Modbus device to appear as an individual BACnet-compliant device. What is needed is a device profile for each Modbus type device. Contemporary Controls maintains a library of common device profiles. If one is not available, Contemporary Controls will provide it upon request. Custom device profiles can be uploaded to the BASgateway. Using web pages and a resident database of common Modbus device profiles, Modbus data points from Modbus Serial or Modbus TCP devices can be mapped to BACnet objects. Gateway Functionality Between ... • Modbus Serial (RTU or ASCII) and BACnet/IP • Modbus TCP and BACnet/IP Routing Functionality Between. • Modbus Serial (RTU and ASCII) and Modbus TCP Flexible Communication Ports • 10/100 Mbps Ethernet with auto-negotiation and Auto-MDIX • Opto-isolated serial port supports either 2-wire or 3-wire EIA-485 • Jumper-selectable EIA-485 bias and termination • Baud rates from 2.4-115.2 kbps Convenient Installation • 24 VAC/VDC powered • DIN-rail mounting

Data Sheet — BASgatewayLX BASgatewayLX — Modbus to BACnet Gateway The BASgatewayLX is housed in a metal case that mounts on 35-mm DIN-rail and it is powered from a 24 VAC/VDC (± 10%) source. Its half-wave rectified power supply allows sharing of power with other half-wave devices. The optically-isolated serial port allows for connection to either 2-wire or 3-wire EIA-485 networks using a removable 5-pin terminal block. Up to 30 EIA-485 Modbus devices can share the serial bus at data rates between 2.4 and 115.2 kbps. Internal jumpers allow flexible bias and termination options. They can be...

Data Sheet — BASgatewayLX Web Page Configuration CONTEMPORARY Controls Mapping Status Mapping Configuration Modbus Utility Upload Profile Configure Settings System System Name: IP Address: Subnet Mask Gateway Address: BACnet Device Instance: UDP Port BBMD IP Address BBMD Reg Time: Virtual Network: Modbus Saudrate: Protocol: Parity Command Timeout Inter Scan Delay Offline Poll Period: Consecutive RD Delay Max Consecutive RD: |Derault Configuration Name [10.0.0^241 (255.2552550 |0000 Onboard Help each screen includes information that relates to the current view Configure Settings all...

Data Sheet — BASgatewayLX Web Page Configuration — Continued Check Status examine device properties and see which devices are online or not add device profiles when needed Modbus Utility view coils and read or write data points via web browser Add, Alter, Delete devices with ease Clone Devices and all their points

— Using Virtual BACnet Routing Application Information With the BACnet protocol, physical BACnet devices are assigned unique device instances. In this way, any BACnet device within the same BACnet internetwork can be uniquely identified. Accommodations must be made for non-BACnet compliant devices such as Modbus but the ability to uniquely identify each Modbus device within the BACnet internetwork can be retained thanks to the BASgatewayLX and the concept of virtual networking. The BASgatewayLX has one Modbus serial port that can accommodate up to 30 physical Modbus serial devices. Each one...

Data Sheet — BASgatewayLX The BASgatewayLX is shipped with a default private IP address. Once its internal web server can be reached with a standard web browser configuration can begin. It will be necessary to have Java 6 or later installed on your browser. There are three sections that must be addressed once the Configure Settings tab is clicked. System Eventually, the default IP address and subnet mask will need to be changed but if this data is ever lost, it is possible to reset the IP address to its default settings without losing any other configuration data. The installer can choose a...

— Managing Modbus Devices Application Information Once the BASgatewayLX is properly configured, Modbus device profiles can be added for each attached Modbus device. The process for adding devices is similar for Modbus Serial or Modbus TCP devices. Adding a Device By clicking on the Mapping Configuration tab you will be presented with a Configured Devices box showing all Modbus devices that are currently being assessed by the BASgatewayLX. Clicking on any of the devices listed will show you a Device Information box showing the device profile of that particular device. The device profile...

Data Sheet — BASgatewayLX Application # 1 — Two Virtual Networks The most common application is adding one or more Modbus serial networks to a BACnet system. Each Modbus serial network must be configured for the same Modbus serial protocol (RTU or ASCII), the same data rate (2400–115200 baud), and the same parity (ODD, EVEN or NONE). Make sure any wiring issues with 2-wire and 3-wire devices are addressed. With the system shown as below, two virtual BACnet networks must be assigned — network 1 and network 2 — which are separate from the real BACnet network numbered as 3 in this example. If...

Data Sheet — BASgatewayLX Application # 3 — Modbus Serial to Modbus TCP Routing Inherently, the BASgatewayLX will function as a Modbus serial to Modbus TCP router. In this mode no mapping configuration is needed since BACnet is not involved. Modbus TCP devices can function as clients, servers or client/servers. When a Modbus TCP server device is configured, it must be assigned a slave address as well as an IP address. When a Modbus TCP client accesses a Modbus TCP server, communications occurs over Ethernet with no involvement with the BASgatewayLX. However, if a Modbus TCP client...