User's Manual - from Measurement Computing

Operation Matrix*Expansion Digital I/O (DaqBoard/2000 Series only)The DaqBoard/2000 Series boards that have digital I/O capabilities have the ability to expand thesethrough the P2 port and the connection of applicable digital I/O expansion modules. These modules arediscussed in the DBK Option Cards & Modules User’s Manual. When using the digital I/O expansionmodules the local P2 Intel 8255 digital I/O becomes inaccessible in lieu of the expansion modules. Theseexpansion modules provide additionally Intel 8255 ports as well as input isolation for applications thatrequire the expanded capabilities.Pulse Stream Output Using TimersThe boards allow the generation of output pulses based upon a programmable setting. These output timerscan be set at any time regardless of the state of any synchronous or asynchronous operations which arecurrently taking place on other channels.Analog Output ChannelsThe boards that have analog output capabilities have the ability to output analog data to any of theavailable (up to four) D/A channels. Each D/A channel may be asynchronously updated by an applicationif the D/A channel is not currently being used for waveform output operations.Counter Input ChannelsWith exception of DaqBoard/2003, the boards have counter input capabilities and have the ability to readcounter input [if the counter channel is not configured for synchronous acquisition]. As in the case ofsynchronous operations the 4 16-bit counter input channels can be used individually or cascaded into two32-bit counter channels. For either cascaded or non-cascaded counter channels each channel can beconfigured for:• Clear on Read Mode - specifies that each counter should be cleared (reset to 0) upon being read.• Continuous Totalize Mode – specifies that each counter is to free-run and not be cleared duringthe read operation.Operation 1000 1005 2000 2001 2002 2003 2004 2005Synchronous InputAnalog Main Unit Inputs Yes Yes Yes Yes No No No YesAnalog Expansion Input No No Yes Yes No No No YesCounter Inputs Yes Yes Yes Yes Yes No Yes YesDigital Main Unit Inputs Yes Yes Yes Yes Yes No Yes YesDigital Expansion Inputs No No Yes Yes Yes No Yes YesSynchronous OutputAnalog D/A Waveform Output Yes No Yes Yes No Yes Yes NoStreamed Digital Output (16-bit) No No Yes Yes Yes No Yes YesAsynchronous IOMain Unit Digital I/O Yes Yes Yes Yes Yes No Yes YesExpansion Digital I/O No No Yes Yes Yes No Yes YesTimer Output (Pulse Generation) Yes Yes Yes Yes Yes No Yes YesAnalog Output Yes No Yes Yes No Yes Yes No* A similar matrix, intended to highlight board differences at a glance, is presented on page 1-3.1-6 Daq Systems and Device Overviews 929095 DaqBoard/1000 and /2000 Series User’s Manual