Supported Device Driver Capabilities103TachometerTable 20: Tachometer OptionsDT9837 Series A/D D/A DIN DOUT C/T TACH QUADTachometer Falling EdgesSupportsFallingEdge Yes aa. On the DT9837 module, the starting edge is always rising; on the DT9837A and DT9837B modules, the starting edge isprogrammable (either rising or falling). For the DT9837A and DT9837B, you specify the edge using the Open LayersControl Panel applet, described on page 36, or by writing to the registers of the module, described on page 135; youcannot use the DT-Open Layers for .NET Class Library to configure these settings.Tachometer Rising EdgesSupportsRisingEdge Yes aTachometer Stale Data FlagSupportsStaleDataFlag Yes bb. The Stale Data flag can be 0 or 1 on the DT9837A and DT9837B; the Stale Data flag is always 0 on the DT9837. For theDT9837A and DT9837B, you specify whether to use the Stale Data Flag using the Open Layers Control Panel applet,described on page 36, or by writing to the registers of the module, described on page 135; you cannot use the DT-OpenLayers for .NET Class Library to configure these settings.
