Measurement Computing 2000 Series Daqboar - Manual (Page 53)

DaqBoard/2000 Series & /2000c Series User’s Manual 10-18-02 Daq Systems and Device Overviews 1-27
Digital I/O
Applicable to DaqBoard/2000, /2001, /2002, /2004, /2005, /2000c, /2001c, /2002c, /2004c and /2005c
Channels: 40, expandable to 208 with external DBK options
Input Scanning Modes: 2
1. Asynchronous, under program control at any time relative to input scanning
2. Synchronous with input scanning
Ports: 3 x 8-bit (82C55 emulation), and 1 x 16-bit. Each port is programmable as input or output.
Input Characteristics: 100
Ω series, 20 pF to common
Input protection:
±8 kV ESD clamp diodes parallel
I/O levels: TTL
Sampling/Update rate: 200 kHz maximum
Pattern Generation Output
Applicable to DaqBoard/2000, /2001, /2002, /2004, /2005, /2000c, /2001c, /2002c, /2004c, and /2005c
The P3 16-bit digital I/O port can be configured for 16-bit pattern generation. The pattern can be
updated synchronously with an acquisition from a file. If pattern generation mode is utilized, then the
D/A outputs can only be used in an asynchronous mode. Bus mastering DMA provides CPU and
system-independent data transfers, insuring data acquisition performance irrespective of other system
activities. Streaming from disk or memory is supported, allowing continuous, nearly-infinite length,
pattern outputs (limited only by available PC system resources)
Frequency/Pulse Generators
Applicable to DaqBoard/2000, /2001, /2002, /2004, /2005, /2000c, /2001c, /2002c, /2004c, /2005c
Channels: 2 x 16-bit
Output Waveform: Square wave
Output rate: 1 MHz base rate divided by 1 to 65535 (programmable)
High level output voltage: 2.0 V minimum @ -3.75 mA, 3.0 V minimum @ -2.5 mA
Low level output voltage: 0.4 V maximum @ 2.5 mA
Frequency/Pulse Counters
Applicable to DaqBoard/2000, /2001, /2002, /2004, /2005, /2000c, /2001c, /2002c, /2004c, and /2005c
Counter inputs can be scanned synchronously along with analog and digital scanned inputs, based
either on internal programmable timer, or an external clock source. Bus mastering DMA provides
CPU and system-independent data transfers, insuring data acquisition performance irrespective of
other system activities. Counters can be configured to clear when read, or to totalize and clear under
program control.
Channels: 4 x 16-bit, cascadable as 2 x 32-bit
Input rate: 10 MHz maximum
Input Signal Range: -15 V to +15 V
Input Characteristics: 2.7 k
Ω series in parallel with 20 pF to common and 10 kΩ to +5 V
Input protection:
±8 kV ESD clamp diodes parallel
Trigger Level: TTL
Minimum pulse width: 50 ns high, 50 ns low
Included Accessories and Software
Software: Windows Drivers (32-bit), 90-day Getting Started DaqView
Hardware: DBK205 is included with only DaqBoard/2003 and DaqBoard/2003c. This adapter option
provides screw-terminal access to the board’s four analog outputs (DAC0, DAC1, DAC2,
and DAC3), 1 digital ground, 5 analog grounds, an external clock (CLK), and an external
trigger (XTTL).