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.