BACnet MS/TP
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BACnet MS/TP - or "Mulitdrop Serial Bus / Token Passing" is a RS-485 physical layer designed to support multiple devices sharing a RS-485 bus. It is primarily used for small controllers such as for VAVs, RTUs, sensors or actuators.
The language has changed to avoid the derogatory Master-Slave/Token Passing used in the past, but it will take a while for the industry to migrate from this embedded use of the language.