Measurement Computing 2000 Series Daqboar - Manual (Page 37)

DaqBoard/2000 Series & /2000c Series User’s Manual 10-18-02 Daq Systems and Device Overviews 1-11
DaqBoard/2001 & DaqBoard/2001c
16 4
40 6
DaqBoard/2001 and DaqBoard/2001c are high-speed, multi-function, plug-and-play data acquisition boards
for PCI or compact-PCI bus computers, respectively. They feature a 16-bit, 200-kHz A/D converter, digital
calibration, bus mastering DMA, four 16-bit, 100-kHz D/A converters, 40 digital I/O lines, four counters,
and two timers.
Up to 470 channels of analog and digital I/O can be accessed with one DaqBoard/2001 or one /2001c
board. Up to four boards can be installed into a PC.
A 100-pin connector on the DaqBoard/2001 or /2001c provides access to all of the input and output signals.
The boards accommodate all I/O with one cable and one PCI [or compact-PCI] slot. The 100-pin I/O
connector, P4, is logically divided into three ports:
• P1 – Analog input port for16 single-ended or 8 differential analog inputs with 13 software
programmable ranges (
±10 V to ±156 mV full scale).
• 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 10µs/channel.
Bus mastering allows analog and digital/counter input data, as well as analog and digital output data, to flow
between the PC and the DaqBoard/2001, or to the DaqBoard/2001c, without consuming CPU time.
DaqBoard/2001 and DaqBoard/2001c support a full complement of trigger modes including:
• Hardware analog triggering – A user-programmed trigger level sets an analog DAC, which is
compared in hardware to the analog input level on the selected channel. Trigger latency is < 5
µs.
• Digital and pattern triggering – The DaqBoard/2001 and /2001c have 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. (These channels are
separate from the D/As used to determine analog trigger levels.) 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/2001 and /2001c 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/2001 or on the
DaqBoard/2001c.