Spectrum Controls 1734sc-OE2CIH - Manual (Page 37)

User’s Manual Pub. 0300272-01 Rev. A.0
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.
Section 4.2
Detecting HART
Devices