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8
DESCRIPTION OF HART INTERFACE
40
SMARTPAT PH 8530
www.krohne.com 03/2016 - 4002544803 - MA SMARTPAT PH 8530 R03 en
8.3 Connection variants
The sensor is a 2-wire device with a passive 4...20 mA current output and HART
®
interface.
• Multidrop mode is supported Multidrop mode is supported Multidrop mode is supported Multidrop mode is supported
In a multidrop communication system, up to 32 devices can be connected to a common
transmission cable.
• Burst mode is not supported Burst mode is not supported Burst mode is not supported Burst mode is not supported
In the burst mode a slave device transfers cyclic pre-defined response telegrams, to get a
higher rate of data transfer.
There are two ways of using the HART
®
communication:
• as Point-to-Point connection and
• as Multidrop connection, with 2-wire connection.
CAUTION!
For installation in a multidrop communication system please consider the voltage drop for the
250
Ω
loop resistance for HART ® communication. The supply voltage has to be adjusted.