Chapter 6. Program Organization114 PACSystems* RXi Distributed IO Controller User Manual GFK-2816FService Requests(SVC_REQ)1,Change/read constantsweep timer2,Read window modesand time values3,Change controllercommunications windowmode and timer value4,Change backplanecommunications windowmode and timer value5,Change backgroundtask window mode andtimer value6,Change/read numberof words to checksum7,Read or change thetime-of-day clock8,Reset watchdog timer9,Read sweep time frombeginning of sweep -milliseconds10,Read target name11,Read controller ID12,Read controller runstate13,Shut down (stop)controller14,Clear controller orI/O fault tables15,Read last-loggedfault table entry16,Read elapsed timeclock - microseconds18,Read I/O overridestatus19,Set runenable/disable20,Read fault tables21,User-defined faultlogging22,Mask/unmask timedinterrupts23,Read masterchecksum50,Read elapsed timeclock – nanoseconds51,Read sweep timefrom beginning of sweep- nanoseconds