Specifications

Section-4 Theory
October 17, 2013
4‐4
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4.2.3 TransmitterControlUnit(TCU)
Figure 4-3 TCU Block Diagram
TheTC
U(TransmitterControlUnit)ispresentindualdriveUAXtransmittersystems.TheTCUcontrolsLPUswitching
andalsoservesasacentralcustomerinterfaceviaitsgraphicaluserinterface(GUI)touchscreen.
TheTC
UGUIistheprimarylocalinterfacefortheoperatorbutisnotrequiredtooperatethetransmitter.TheTCU
assignsanLPUastheprimary(ormaster),andthesecondLPUbecomestheslave.Basicoperatorcontrols,suchas
on,off,raise,andlower,arelocatedontheTCUfr
ontpanelnexttotheGUI.OperationandnavigationoftheGUIis
discussedinSection3ofthismanual.
TheTC
Ucontainsfourprincipalcircuitcards:TheMCM,PCM,TCUInterface,andCustomerIO.
4.2.3.1 MCMCard
TheTCUcontainsanMCM(MasterControllerModule)card.TheMCMisamicroprocessor‐basedcontrollerusedfor
allcriticalsystemcontrolfunctions.Inadditiontocontrolfunctions,theMCMisresponsibleformaintaininglife
supportoperationwhenthePCMcardisnotoperational.
4.2.3.2 PCMCard
TheTCUcontainsaPCM(ProcessorControlModule)card.ThePCMcontrolsthecolorpanelPCGUItouchscreenfor
enhancedmonitoringandcontrol.Italsoprovidestransmittersystemdata,faultlogs,webremoteconnectivityvia
TCP/IPconnection,SNMPerrortrapreportingandconfigurationandsetupinterface.
4.2.3.3 TCUInterfaceCard
TheTCUcontainsaLAX/UAXTCUinterfacecard,whichinterfacestoseveralofthesubsystemsoftheVAXdualdrive
configurationandreportsdirectlytotheMCM .ItinterfacestothetwoLPUsandcommandsthemtoassumea
masterorslavestatus.(pin14ofparallel“TXInterface”connectionviaDB
25).ItalsocommandsthedualdriveRF
coaxialrelaytoperformanLPUswitchover,whenrequired.Thesysteminterlockconnectionismonitored(RS‐485/
ILOCKbusviaDB9)toensuretheinterlockisclosedandthesystemmaybeoperatedsafely.
FRONT
PANEL
PC (GUI)
FRONT
PANEL
BUTTONS
MASTER
CONTROL
MODULE
(MCM)
PROCESS
CONTROL
MODULE
(PCM)
CUSTOMER
I/O
CARD
TCU
INTERFACE
CARD
OPTIONAL TRANSMITTER CONTROL UNIT (TCU)
TX ROOF
INTERLOCK
CONNECTION
(ASF)
LPU B
LPU A
PA
BLOCK(S)
DB25
DB25
RS485/ILOCK
RS485/ILOCK
CAN
CAN