43Chapter 2. Getting Started the BHT and System Mode2.5.2 Operating in System ModeSome functions in System Mode require several screens to be shifted, as shown in theexample below.[ 1 ] Calling up the desired set screenFirst, select a desired item on the current screen by using the numerical key or the M1and M2 keys so as to highlight the desired item.Press the ENT key to establish the selected item and proceed to the subsequent screen.To return to the preceding screen, press the C key.BHT-100BBHT-100QENT keyC keyENT keyC keyENT keyC keyENT keyC keyENT keyC keyENT keyC keyPress the 4 key or useM1 and M2 keys toselect "4:SET SYSTEM."Press the 5 key or useM1 and M2 keys toselect "5:COM."Press the 3 key or useM1 and M2 keys toselect "3:COM PORT."