Bacnet/Modbus Communications; Introduction; Bacnet - Siemens SITRANS FST020 IP65 NEMA 4X Betriebsanleitung

A.2

BACnet/ModBus Communications

A.2.1

Introduction

Introduction
The Siemens SITRANS FST020 Flow Meter firmware version 2.04.06 and later includes
ModBus and BACnet communication selectable during the configuration of the meter.
Note
IMPORTANT
To invoke BACnet or ModBus communications, RS-485 setup parameters must be enabled.
A.2.2

BACnet

BACnet Communication Protocol
BACnet is a standard communication protocol for B
developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers
(ASHRAE). BACnet provides the communication infrastructure needed to integrate products
made by different vendors. BACnet communication is based on standard objects. Each
BACnet Device includes a Device Object and other optional objects within the device. Each
object has associated properties. This document defines the FST020 BACnet objects and its
properties. The FST020 includes (1) Device Object, (29) Analog Value Objects, and (11)
Binary Value Objects.
The FST020 functions as a BACnet slave device on a BACnet MSTP RS485 network. A
typical illustration of how this might be configured in a plant network is illustrated in the figure
below.
Note
IMPORTANT
The BACnet proxy router is not included and must be supplied by the user.
FST020 IP65 NEMA 4X Quick Start
Operating Instructions, 08/2014, A5E03086489-AJ
A.2 BACnet/ModBus Communications
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Appendix
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