Endress+Hauser Hart RN221N Manual Del Usuario página 37

Selecting the operating mode
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DIP switch 10 can be used to specify whether RN221N with HART diagno-
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sis evaluates the HART status bytes or the E+H diagnostic command #231.
If all the DIP switches from 4-9 are in the "OFF" position (no masking of a sta-
tus bit or a stage in the "quality code"), the 4-20 mA signal is automatically
used for failure signal detection regardless of which position DIP switch 10 is
set to.
Bypassing the internal 250  communication resistor
The internal communication resistor can be bypassed using DIP switch 1 to
make it possible to use an external communication resistor. It is then no longer
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possible to connect a HART master to the communication jacks of RN221N.
Primary/secondary master
DIP switch 3 can be used to specify whether RN221N polls the transmitter as
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a primary or secondary master. This setting is important if another HART
master, apart from RN221N, is in the network (e.g. control system with
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HART functionality). This setting must be selected in such a way that there
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are never two HART masters of the same type in the HART network. This
setting is not significant in the "Current measurement" operating mode.
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