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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 3: GUIDED TOUR of the HARDWARE 53

ParallelInputs0‐7

Allinputsarespeciallytreatedtoaccepteitheravoltage(upto24VDC),oraclosuretoground,

whichmaybeprovidedbyswitches,relays,orlogicoutputs.Theinputsareactivelow.Inother

words,shortingtheinputtogroundcausesittobecometrue(i.e."asserted").

Abuiltin1kΩpullupresistorisprovidedsoTT

Loutputscanbedirectlyinterfaced.Seebelow

forasimplifiedschematicoftheinputcircuitry.

+5 VDC

(30 Volts max)

INPUT

PIN 25

Parallel logic input circuit

t

DEEP TECH NOTE!

The Zephyr Xstream’s “universal” logic input circuit can be used with switch or relay

closures, voltage levels up to 24 Vdc, or logic outputs – either “totem-pole” or open-

collector.

TheinputscanbetransmittedtothefarendZephyrXstreamwhenusingtheLayer‐3orAAC

codingmode.TheinputscanalsobeusedforlocalcontrolfunctionalitysuchastriggeringDial

Setups(PanicDial).RefertoSection11.5(DetailedMenuReference)forthemenuselections

relatingtothesefunctions

.

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