Features

Gateway Functionality Between... Modbus Serial (RTU or ASCII) and BACnet/IP Modbus TCP and BACnet/IP Convenient Installation 24 VAC/VDC powered DIN-rail mounting

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

Overview

Modbus devices remain popular in boiler control, variable speed drives, and energy metering applications, but these devices lack BACnet compliance. The BASgateway connects BACnet/IP Ethernet to non-BACnet compliant networks such as Modbus Serial or Modbus TCP allowing up to 30 Modbus devices to appear individually as BACnet devices. It has a 10/100 Mbps Ethernet port for BACnet/IP and Modbus TCP connections, and an opto-isolated Modbus EIA-485 serial port for Modbus RTU or Modbus ASCII devices. Using web pages and a resident database of common Modbus device profiles, Modbus registers from either Modbus TCP or Modbus Serial devices can be mapped to BACnet objects.

Cooperating with Modbus device manufacturers, Contemporary Controls has developed a library of Modbus device profiles that reside within the BASgateway — thereby removing a significant burden from the system integrator commissioning the system. If custom device profiles are required, they can be uploaded to the BASgateway.

The BASgateway is housed in a metal case that mounts on 35-mm DIN-rail and 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 removed for mid-span installations.

The Ethernet port offers a shielded RJ-45 connector. Through auto-negotiation and Auto-MDIX, it automatically matches connections to the attached equipment. Therefore, either CAT5 straight-through or crossover cable can be used to attach to the BACnet/IP or Modbus TCP network at either 10 or 100 Mbps speed.

A resident web server allows for commissioning, and troubleshooting via a standard web browser. A reset switch is provided on the router to return the unit to the factory default IP address. LED indicators provide communication status on both the Ethernet and Modbus ports.

A Type A USB port supports memory stick storage of configuration data for backup purposes.

Ordering Information

Model	Description	Purchase
BASGATE-M1	Gateway between Modbus and BACnet	Coming Soon