Measurement Computing DaqBoard 1000 Series - Manual (Page 33)

DaqBoard/2000
16 Analog
Input
2 Analog
Output
40 Digital
I/O
4 Counter
Inputs
2 Timer
Outputs
DaqBoard/2000 and DaqBoard/2000c are high-speed, multi-function, plug-and-play data acquisition
boards for PCI and compact-PCI bus computers, respectively. They feature a 16-bit, 200-kHz A/D
converter, digital calibration, bus mastering DMA, two 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/2000. Up to four boards
can be installed into a PC.
A 100-pin connector on the boards provides access to all of the input and output signals. The
DaqBoard/2000 and /2000c 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 10 µs/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/2000 without consuming CPU time.
DaqBoard/2000 supports 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 boards 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 two 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/2000 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/2000.
DaqBoard/1000 and /2000 Series User’s Manual 889094 Daq Systems and Device Overviews 1-11