Installation, Operation and Maintenance Manual
VCIOM-15345-EN Rev. 1
February 2022
35
Communication Protocols
Section 5: Communication Protocols
Figure 15
HART Topology
STC Pin
HART Connections
41
HART 0+ (AO+)
42
HART 0- (AO-)
43
HART I+
44
HART I-
24
Shield
5.2
HART
The EHO actuators are capable of offering HART7 communication protocol over the widely
used 4 - 20 mA analog channels. The HART CAM interface board certified by the Fieldcom
group (previously HART Communication Foundation or HCF) is capable of offering
Point-to-Point, Multi-drop and Wireless HART communication topologies. Networks may
extend up to 3000 m with Point-to-Point topology; and from 250 m to 2000 m when 1 to
10 devices are connected using Multi-drop topology. The Wireless HART supports up to
100 devices when connected to one Emerson Gateway, extending the number of devices
when multiple Emerson Gateways are installed.
Table 7.
HART Pin Connections
