Measurement Computing DaqScan 2000 Series - Manual (Page 70)

Specifications are subject to change without notice.
11-4 Specifications 898095 DaqScan/2000 Series
Digital I/O
Channels: 40, expandable up to 272 with external digital DBK options
Input Scanning Modes: 2 programmable
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.
Connectors:
37-pin DSUB (P2) on rear panel: for three 8-bit ports (24-bits)
37-pin DSUB (P3) on rear panel for DIGITAL I/O channels 0 through 15 (16-bit port)
Input Characteristics: See following Digital I/O figures
Input protection:
±8 kV ESD clamp diodes parallel
I/O levels: TTL
Sampling/Update rate: 200 kHz maximum
Output Characteristics: See following Digital I/O figures
Frequency/Pulse Counters
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, ensuring 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
Frequency Measurement Rate: 10 MHz maximum
Connectors: 37-pin DSUB (P3) on rear panel; pin 18 (CTR0), pin 36 (CTR1), pin 17 (CTR2), pin 35 (CTR 3)
Input Signal Range: -15 V to +15 V
Trigger Level: TTL
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
Minimum pulse width: 50 ns high, 50 ns low
Timer Outputs
Channels: 2 x 16-bit
Connectors: 37-pin DSUB (P3) on rear panel; pin 15 (TMR0), pin 16 (TMR1)
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