HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier Revision 6
Serial-Based Remote Product Management MN/HPOD.IOM
5–3
• ThermalShut down. Thesystemindicatesatemperaturefaultiftheunitis≥+95°C.Thiscreatesasummaryfaultandcausesthe
unit to mute itself, and switch to the backup unit if in a redundancy system. However, the 10V supply to the Field Effect
Transistors(FETs)will remainonun
tiltheunitreachesthethermalshutdowntemperatureof≥100°C.Forprotectionreasons,
theunitwillshutdownthe10Vsupplytothepowertransistorsattemperatures≥100°C.
5.2.5 Power Detector
TheHPOD featuresa powerdetectorto monitortheoutput power.It hasauseful rangeof over20 dB,referenced tothe unit’s rated
P1dBpoint.Toreaditsvalue,executethe“RMS”query(e.g.,<1/RMS?<cr>).Thetestdatasuppliedwitheachunitgivesanindicati onof
theaccuracyandflatnessofthepowermonitoroverthefre
quencybandofoperation.
5.2.6 Most Common Remote Queries
• RMS(RetrieveMaintenanceStatus):Displaysvoltages,fanspeeds,Heatsinktemperature,outputpowermonitorreading,etc.
• RCS(RetrieveConfigurationStatus):Displayscurrentattenuation,mute,amplifi er,online,etc.status.
• RAS(RetrieveAlarmStatus):Displayscurrentalarmorfaultstatus.
5.3 Serial Remote Control Introduction
Serial‐basedRemoteProductManagementoftheHPODisavailableviaitsJ6|COM1port.ThisinterfaceiseitheranEIA‐485multi‐drop
bus (for the control of multiple device s) or an EIA‐232 connecti on (for the control of a single device). The interface transmits data in
asynchronousserialform,usingASCIIcharacters.Thi
sdataconsistsofcontrolandstatusinformation,transmittedinpacketsofvariable
lengthinaccordancewiththestructureandprotocolexplainedlaterinthischapter.
5.3.1 EIA-485
Forapplicationswheremultipledevicesaretobemonitoredandcontrolled,full‐duplex(4‐wireplusground)EIA‐485ispreferred.Half‐
duplex (2‐wire plus ground) EIA‐485 is possible, but is not preferred. In full‐duplex EIA‐485 communication, there are two separate,
isolated,independent,differential‐modetwistedpairs,eachhandli
ngserialdataindifferentdirections.
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