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XNX Universal Transmitter

Section 1 - Introduction

1.2.3 POD

ThePOD(Personality,Options,andDisplay)enclosescircuit

boardsforthepersonalitymodule,optionalinterfaces,and

display�

Thepersonalitymodule,orcircuitboard,determinesthe

transmitterbehaviorbasedonthesensortypeattachedto

thetransmitter(electrochemicalcell,catalyticbeadsensor,or

infrared)andprovidesthenecessaryinterface�Connectiontothe

attachedsensorismadethroughthesensorconnectoraccessed

viaaslotinthePODhousing�

Theoptionalcommunicationboardsvarydependingonthe

optionselectedwhenordered�Onlyoneofthethreeavailable

interfaceoptions(relays,Modbus,orFoundationFieldbus)can

beattachedtotheXNXtransmitter�

Figure 6. POD, exploded View

1.3 Options

1.3.1 Local HART

Availablewithanysensortechnologyorpersonality,anexternal

accesstotheHARTinterfaceintheXNXtransmitterisprovided�

Anintrinsicallysafe(IS)barrierinsidethetransmittergivesthe

userfullcontrolusingahand-heldinterrogatorforprogramming

andconguration�Theexternalinterfaceisinstalledinthelower

leftcable/conduitportofthetransmitterandisintrinsicallysafe�

Formoreinformation,seeAppendixA-HARTProtocol�

Figure 7. XNX Universal Transmitter with HART Interface IS Barrier

1.3.2 Relays

Therelayoption(XNX-Relay)provides3form“C”(SPDT)

normallyopen/normallyclosed(NO/NC)contactsforalarm

andfaultindication�Aremoteresetinputisprovided(TB4)�

MomentarilyclosingthethecircuitbetweenthepinsofTB4

performsthesamefunctionastheResetAlarms&Faults

command�

TheXNXtransmitterhasthreerelays:relay1isforalarmlevel

1,relay2isforalarmlevel2,andrelay3isforfaultsandspecial

Honeywell XNX Technical Manual

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