Operating a Serial CIM
194
On Line Mode
WhenyouoperateAUATCinOnLineMode,themainscreenarea
displaysyourinteractionswiththeASCIIdevice,asifitwerethescreen
ofanASCIIterminal.Simultaneously,thedatastreambeingoutputby
thedeviceisstoredinaneight‐pagecircularbuffer,soyoucannotonly
accessandop
eratethedevice,butyoucanalsoreviewitshistoricaldata
asneeded.Becausethebufferiscircular,italwaysretainsthemostrecent
eightpagesofdatafromthedevice;thenewestdatawilloverwritethe
oldestdata.