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The four touch switches provide tactile ("popping") feedback when properly <br /> actuated. <br /> The ON/OFF key serves only to turn on the unit(while it is in the off state),and to <br /> turn it off(when it is operating). <br /> The EXIT and ENTER keys serve to execute specific commands that may be <br /> indicated on the screen,and the NEXT key generally serves to scroll the displayed <br /> information,e.g. to review the operating parameters that have been programmed, <br /> display maximum/STEL values, diagnostic values, etc. <br /> If an incorrect command is keyed (e.g. ENTER when the personalDataRAM displays <br /> real-time concentration) a beep is heard to alert the user. <br /> The two-line,16-character per line LCD indicates either measured values of <br /> concentration (instantaneous and time averaged on the same screen),elapsed run <br /> time,maximum and STEL (short term excursion limit)values,operating and <br /> logging parameters, diagnostics, or other messages. <br /> The acoustic alarm transducer is located directly behind the center of the NUE arrow <br /> logo on the front panel. <br /> 5.2 Bottom Base <br /> Refer to Figures 3 (for model pDR-1000AN) or 4 (for model pDR-1200).The base of <br /> the personalDataRAM contains the following: a) internal battery compartment <br /> cover,b)external DC power input receptacle, and c) threaded bushing for the <br /> attachment of optional battery pack, tripod,or other mounting/support hardware. <br /> Only the internal battery compartment cover should be opened by the user,for <br /> removal and replacement of the on-board 9-V battery.Removal of the base plate <br /> could result in voiding of instrument warranty. <br /> 5.3 Right Side Panel <br /> Refer to Figures 5 (for model pDR-1000AN) or 6 (for model pDR-1200)which shows <br /> the manner of attachment of the belt clip assembly(belt clip should be attached <br /> only if required by the user).The right side panel (as viewed from front panel) <br /> contains the 6-contact modular jack connector receptacle for digital(RS-232) <br /> communications and analog signal output. This connector also provides the alarm <br /> output control for a remote/auxiliary alarm signal. The contacts (from top to <br /> bottom) are: <br /> 1: 4 -20 mA analog output(positive) <br /> 2: Alarm output <br /> 3: Digital data transmission <br /> 4: Digital input <br /> 10 <br />