FSR FLEX LT-200 - Analog Input


11
triggerpullsitlow.Whenoperatingasanoutput,theGPIOpinisacurrentlimited,
opencollectoroutput.When“off”,theoutputwill“leak”about0.3mAtogroundif
connectedtoapositivevoltage.When“on”itcansink100mAtoground,witha
saturationvoltageofapproximately2.4volts.Thismakestheoutputidealfor
drivingrelaycoils,butitmayormaynotdrivedevicesintendedtooperatefromTTL
ordrycontactclosures.Youwillneedtoknowthetriggerthresholdofthedeviceto
besurethatitiscompatiblewiththeGPIOportsontheFlex.Ifyouareunsureorif
yourdevice’striggervoltageisbelow+2.4VDCoryourdevicerequiresa“dry”
contactclosure,youshouldinterfaceyourdevicethroughanIT‐R4Sserialrelay
module,theK‐10DrelaymoduleoroneoftheotherKSeriesrelaymodules.TheIT‐
R4SwillinterfacetotheFlexviaoneoftheserialportswhiletherelaymodulewill
interfacethroughtheGPIOports.TheIT‐R4Shasaserialpass‐throughporttoallow
anotherdevicetobeconnectedtoit.Thisallows2devicestoshare1serialporton
theFlex.TheI/OPortsaretobewiredasshownbelow:


AnalogInput
TheFLEXpanelhasoneanaloginput.Thisinputwillreceivea0to10voltDCrange
signal.
NOTE:Theanaloginputisdesignedforfutureuse.