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Service Instructions
MAN-02-08-77-0714-EN Rev. 2
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 WirelessHART communication topologies. Networks may extend
up to 3000 meters with Point-to-Point topology; and from 250 meters to 2000 meters
when 1 to 10 devices are connected using Multi-drop topology. The WirelessHART
supports up to 100 devices when connected to one Emerson Gateway, extending the
number of devices when multiple Emerson Gateways are installed.
Table 6.
Figure 24
Communication Protocols
HART Pin Connections
STC PINS
41
42
43
44
24
HART Topology
Section 5: Communication Protocols
HART CONNECTIONS
HART 0+ (AO+)
HART 0- (AO-)
HART I+
HART I-
Shield
September 2020
39
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