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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 32

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 the 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 contact Telos Systems Customer Support.

These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

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

isintherangeif2.2KΩto10KΩ.Opera

tion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pi

n1)andrunthispowersourcethroughyourdevice,witharesistorin

seriestolimit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(Detail

ed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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