User’s Manual Pub. 0300272-03 Rev. B
Chapter 4
OE2CIH and HART
This chapter describes how to read and write HART data using the OE2CIH
module. The chapter includes the following sections:
•
HART features
•
Detecting HART devices
•
Auto scanning of HART dynamic variables
•
Supported HART CIP messages
Section 4.1
HART Features
The OE2CIH module functions as a HART master and communicates with
HART devices running HART revision 5 or greater. The OE2CIH module
includes one HART modem per channel to provide maximum acquisition speed
and flexibility.
The HART transmitter and receiver conform to the HART Foundation’s physical
layer specification for a HART primary master. These specifications include AC
P-P voltage digital transmission bandwidth, analog signal bandwidth, wave
shape, and a capacitive drive.
The module performs the following HART operations:
•
Automatically reads the four dynamic HART variables; PV, SV, TV, and
FV.
•
Automatically retrieves and stores HART device information, including
manufacturer’s ID device tag name, HART revision level, etc., and
makes the information available via a CIP unconnected message.
•
Automatically retrieves and stores extended device status using HART
Command 48. The extended status can be retrieved using an unconnected
CIP message.
•
Provides a HART pass-through interface using CIP unconnected
messaging to allow you, or a remote client, to send a HART command to
a HART on any channel.
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