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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 52

ParallelOutputs0‐7

Outputsareopencollectortogroundandcansinkupto125mAofcurrenteach(actually,any

outputcansinkupto400mA,howeverthemaximumcombinedcurrentshouldbekeptbelow

1000mA).

w

IMPORTANT!

Outputs on Zephyr Xstream motherboards prior to Rev G (1401-0000--007) cannot be used

with external pull ups higher than 5 volts.

If this ability is required, please contact Telos customer support.

Thesewillincludea10k‐ohm5voltpull‐upresistortoallowdirectinterfacewith5voltlogic

inputsonotherequipment.Ifyourotherequipmentusesavoltagegreaterthan5volts,youwill

needandexternalpullupresistor,unlessitisbuilt‐intothatequipment'sinputs.An

appropriatev

alueisintherangeif2.2K

Ωto10KΩ.Operationwithlogicinputsrequiringa

voltagelessthan5voltsisnotpossible.

IfusedwitharelayorLED,thentieyourexternalpowersourcegroundtopin25(orusethe5

VDCpowersuppliedonpin1)andrunthispowersourcethroughyourdevice,witharesistorin

seriestolimi

tmaximumcurrenttolessthan125mA.

Theoutputscanalsobeusedformonitoringthestatusoftheunit.Thisfunctionalitycanbeset

byseveralmenuselectionsinSYSTEMmenu.RefertoSection11.5(DetailedMenuReference)

forthemenuselectionsrelatingtotheseoutputs.

+5 VDC

(400 mA max)

OUTPUT

Equivalent schematic for the Parallel Outputs.

An external pull up resistor can be used if voltages greater than 5 volts are used. Alternatively, a

voltage source (such as the 5 volts on pin 1) can be driven through an external device (such as a

relay or LED) into the input.

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