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RayTek FA Thermometer User Manual

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Installation

22 MarathonSeriesFA/FR

2. Installallelectronicswiringaccordingtotheapplicablesections5.4,5.7.x,and5.8!

3. PlugtheRS485/RS232interfaceconverterintoyour computer’sserialport, orattachit toa

serialcableconnectedtothecomputer!Use9pinto25pinconverterifnecessary!

4. Ifthe9VDCpowersupplyisused,applypowertotheRS485/RS232converter!

5. Applypower

totheFA/FRsensor!

6. Turnonyourcomputer!



Youneedto makesureanotherserialdevice(e.g.aninternalmodem)isnotusingthe

identicalCOM‐portatthesametime!



AlwaysmakeallelectricalconnectionsbeforeapplyingpowertotheFA/FRsensor!Do

notchangeRS485orpowerconnectionsontheRS485/RS232converterwhiletheFA/FR

sensorhaspowerapplied,asthismaycausedamagetotheInterfaceconverter!

5.7.1MultidropInstallation(4‐Wire)

In4‐wiremultidropinstallationsthedatacanbetransferredinbothdirections,fromsensortoPCand

reverse.



Figure18:Wiringfor4‐WireSensorSetup

5.7.2MultidropInstallation(2‐Wire)

Usingthe2‐wireinstallationsaves2wiresincomparisontothe4‐wireinstallation.Thedisadvantage

is,thatthedatatransfercanbeonlyinonedirectionatthesametime.

To Computer

RS232 serial port

RS232/485

Interface Converter

XXX485CVT…

Electronics Housing

9 VDC power suppl

y

or ...

24 VDC power supply

from RxB

from RxA

from TxB

from TxA

Ground

+24 VDC

(

o

p

tional

)

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