What is the BACnet MS/TP methodology based on?

The BACnet MS/TP (Master-Slave/Token-Passing) methodology is based on EIA-485 serial networking. This standard allows for reliable communication in a network where multiple devices can share the same communication medium. MS/TP utilizes a master-slave architecture where one device acts as the master and the others as slaves, enabling a token-passing protocol that determines which device can transmit data at any given time.

This methodology is specifically designed to work well in building automation and control systems, such as HVAC, lighting, and access control. EIA-485 supports multi-point systems, allowing for long-distance data transmission and the connection of multiple devices in a cost-effective manner. This characteristic makes it particularly suitable for large installations where multiple devices need to communicate over a single network.

In contrast, the other options refer to different networking standards or technologies that do not align with the principles of BACnet MS/TP:

• Ethernet communication typically relies on higher bandwidth and protocols used in local area networks (LANs), which are fundamentally different from the serial connectivity of EIA-485.

• Wireless networking introduces challenges like interference and range limitations that are not a concern with wired serial communications like MS/TP.

• Wi-Fi protocols offer mobility and