Features
Put Modbus RTU devices on a BACnet MS/TP Network and Vice Versa!
Read/Write any standard Modbus register via BACnet objects
300 Non-commandable objects OR
135 Commandable objects OR
Between 135 and 300 objects of mixed types.
Object allocations are user confi gurable
AI, AO, AV, BI, BO, BV, MSI, MSO, MSV objects
COV, COVP subscription support
BACnet slave is Modbus RTU master or vice versa
Bidirectional communication between BACnet and Modbus
Supports Modbus “coils”, input registers, holding registers
Single or double Modbus registers, signed, unsigned, IEEE 754
Modbus register mapping confi gured via object properties
Modbus registers may be scaled (x10, x100, x0.1, x0.01, etc.)
Modbus (master) polling interval confi gurable per point
Commandable BACnet objects implement priority array
Hardened EIA-485 transceiver for serial ports
MS/TP baud rates: 9600, 19200, 38400, 76800
Modbus RTU baud rates: 4800, 9600, 19200, 38400
Powered by 10-30VDC or 12-24VAC 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 -40°C to +85°C; Humidity 5% to 90%
FCC, CE Mark
Fully configurable via BACnet object properties
USB to MS/TP adapter available
Configuration software included for use with USB adapter

Description
The BB2-3010 is a BACnet MS/TP client/server device that functions as a Modbus RTU master/slave. A large number of BACnet objects gives you fl exibility in mapping Modbus registers to any combination of BACnet objects. Packed Modbus registers may be parsed to multiple BACnet objects when reading. Multiple BACnet objects may be packed into a single Modbus register when writing. All standard Modbus register types are supported.
Input objects will poll their assigned Modbus register at the interval you specify, and provide the Modbus data as the Present Value when read. Commandable Output objects are used to write Modbus registers, and will update the Modbus device each time BACnet is updated. The BB2-3010 supports up to 300 non-commandable objects, or up to 135 commandable objects, or a mix in between.
Value objects will poll their assigned Modbus register at the interval you specify. The content of the Modbus register will be given as the Present Value of the BACnet object when read. The Modbus register is written each time the BACnet Value object is written. The Value object corresponds to the Modbus Holding register.
The BB2-3010 is most often used as a Modbus master, but it can operate as a slave while MS/TP operates as a client (master). This makes it possible to put MS/TP devices on a Modbus network (but does still require an understanding of BACnet). MS/TP data in remote devices is queried and saved locally. The local data may then be accessed by another Modbus master.