Communication Modes; Overview; Hart Mode Communication; Figure 4 - Hart Point-To-Point And Multi-Drop Value Scaling - Honeywell STT750 Series User Manual

2.1 Overview

The STT750 SmartLine Temperature Transmitter can be configured for operation with HART version
7 communication. This manual addresses the processes to configure and calibrate a Transmitter for
HART communication.

2.2 HART Mode Communication

When using MCT202/MCT404, but before connecting to a HART transmitter, verify that
the FDC application is used and not the MC Toolkit application.

Transmitters with HART capability have features that vary among manufacturers and with the
characteristics of specific devices. The FDC software application executing on the
MCT202/MCT404 supports the HART Universal, Common Practice and Device Specific
Commands which are implemented in the Honeywell Transmitters.
As indicated in Figure 4, the output of a Transmitter configured for HART protocol includes two
primary modes:
Figure 4 – HART Point-to-Point and Multi-drop Value Scaling

Point-to-Point Mode, in which one Transmitter is connected via a two-conductor, 4-20 mA
current loop to one receiver.

Multi-Drop Mode, in which several Transmitters are connected through a two-conductor
network to a multiplexed receiver device.
Revision 2.0

2 Communication Modes

STT750 Series HART Option User's Manual
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