KROHNE SMARTSENS PH 8320 EN - Manual (Page 33)

DESCRIPTION OF HART INTERFACE
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SMARTSENS PH 8320
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Description of HART interface
7.1 General description
The open HART ® protocol, which can be used for free, is integrated into the sensor for
communication.
Devices which support the HART ® protocol are classified as either operating devices or field
devices. When it comes to operating devices (Master), both manual control units (Secondary
Master) and PC-supported workstations (Primary Master) are used in, for example, a control
centre.
HART ® field devices include measuring sensors, signal converters and actuators. The field
devices range from 2-wire to intrinsically safe versions for use in hazardous areas.
The HART ® data are superimposed over the analogue 4...20 mA signal via FSK modem. This way,
all of the connected devices can communicate digitally with one another via the HART ® protocol
while simultaneously transmitting the analogue signals.
When it comes to the field devices and secondary masters, the FSK or HART ® modem is
integrated. If a PC is used, an external modem must be connected to the serial interface
(USB interface). There are, however, other connection variants which can be seen in the
following connection figures.
7.2 Software history
HART ® identification codes and revision numbers
INFORMATION!
In the table below, "x" is a placeholder for possible multi-digit alphanumeric combinations,
depending on the available version.
Release date SW version HW version HART ®
Device Revision DD Revision
2013-04-01 1.0.x 1.0.x 1 1
Manufacturer ID: 69 (0x45)
Device: 195 (0xC3)
Device Revision: 1
DD Revision: 1
HART ® Universal Revision: 7
FC 475 system SW.Rev.: ≥ 3.7
PDM version: ≥ 8.0
FDT version: ≥ 1.2
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