Communication by BACnet protocol

BACnet is a standard communication protocol for automatization networks and building management (Building Automation and Control Networks) developed by the American ASHRAE consorcium (American Society of Heating, Refrigerating and Air-conditioning Engineers), see The main goal was to create a protocol, enabling multiple systems integration from diffrent manufacturers, primarily designed for building automatiaztion.
Data transfer using the BACnet protocol can be done in differnt ways:
- Ethernet: Trasfer rate of 10MBps or 100MBps, highest performance option.
- ARCNET: Trasfer rate of 2.5MBps, deterministic network with token-passing protocol.
- RS485: serial link, Master-Slave/Token-Passing protocol type (MS/TP). MS/TP includes one or more master nodes, cooperating in logical tokeng-passing circuit. Slave nodes can also be included, able to send messages without master request.

The BACnet protocol on serial link requires very fast communication responses because it is designed for communication between machines on the lowest level. Therefore it is not suitable for communication with supervisory systems of the PROMOTIC SCADA type.

- LonTalk: Proprietary protocol developed by the Echelon company. In BACnet the LonTalk protocol is used only for data transfer from one device to another. See also: Communication in LonWorks networks.

PROMOTIC communication driver PmBACnet:

As the most suitable solution for the BACnet communication in the PROMOTIC application, is used the PROMOTIC driver:

PmBACnet - Driver for communication via the BACnet protocol

This driver is designed for communication over Ethernet.

Communication by OPC server

For the BACnet protocol communication with the PROMOTIC system the OPC servers delivered by third parties can be used. For example:
- delivers the OPC server, ActiveX or DLL library.
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