Measurement Computing 2000 Series Daqboar - Manual (Page 43)

DaqBoard/2000 Series & /2000c Series User’s Manual 10-18-02 Daq Systems and Device Overviews 1-17
DaqBoard/2004 & DaqBoard/2004c
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DaqBoard/2004 and /2004c are high-speed, multi-function, plug-and-play data acquisition boards for PCI
and compact-PCI bus computers, respectively. They feature bus mastering DMA, four 16-bit, 100-kHz D/A
converters, 40 digital I/O lines, four counters, and two timers.
Up to four boards can be installed in one PC.
A 100-pin connector on the boards provides access to all of the input and output signals. Each board
accommodates all I/O with one cable and one PCI [or compact-PCI] slot, as applicable. The 100-pin I/O
connector, P4, is logically divided into three ports: P1, P2, and P3; however, DaqBoard/2004 and /2004c
only make use of the P2 and P3 pin designations.
• P1 – Not used by DaqBoard/2004 or by DaqBoard/2004c
• P2 – General purpose digital I/O port with 24 lines, or digital I/O expansion port controlling up to 192
external lines.
• P3 – 16-bit digital I/O port, counter inputs, timer outputs, and analog outputs.
The on-board scan sequencer lets you select up to 512 channel/range combinations. The sequencer scans all
channels of the scan at 5
µs or 10 µs per channel.
Bus mastering allows the digital/counter input data and analog and digital output data to flow between the
PC and the DaqBoard/2004 [or DaqBoard/2004c] without consuming CPU time.
DaqBoard/2004 and DaqBoard/2004c support several trigger modes, including:
• Digital and pattern triggering – Each board has a separate digital trigger input line, allowing TTL-
level triggering and latencies less than 5
µs. The trigger can be programmed for logic level or edge
triggering. In pattern triggering, any of the digital input ports acts as the trigger port. You can program
the digital pattern.
• Software-based triggering – The PC detects the trigger event from readings, either analog, digital, or
counter. Six pre- and post-triggering modes are supported.
The four 16-bit, 100-kHz analog output channels have an output from –10 V to +10 V. Using Bus
Mastering DMA, each D/A can output a waveform. Bus Mastering DMA also allows for digital pattern
generation on the 16-bit high-speed digital I/O port.
Other features of the DaqBoard/2004 and DaqBoard/2004c include:
• 40 TTL-level digital I/O lines. They are divided into three 8-bit ports and one 16-bit port.
• Four 16-bit counters. Each can accept frequency inputs up to 10 MHz. The counters can be cascaded
into two 32-bit counters.
• Two 16-bit timer outputs. Each can generate square waves from 16 Hz to 1 MHz.
• Configuration through software. There are no switches or jumpers on the DaqBoard/2004 or on the
/2004c.