Measurement-computing PCI-DAS1602/16 Manuel d'utilisateur télécharger pdf (Page 18)

PCI-DAS1602/16 User's Guide Functional Details

Analog outputs

The two high-speed 16-bit dual analog outputs are updated via an on-board FIFO and REP OUTSW

commands, and provide a 100 kHz maximum update rate. Output ranges are individually configurable with

software for ±10 V and ±5 V, 0 to 10 V and 0 to 5 V. The D/A outputs provide rated accuracy to ±5 mA, and

are short circuit protected (25 mA limit). The analog outputs are cleared to 0 V on power up or reset.

Parallel digital I/O

The 24 bits of TTL-compatible, high-current (64 mA sink, 15 mA source) digital I/O are available as two eight-

bit ports and two four-bit ports. This digital capability is an 82C55 mode 0 chip emulation, which allows each

port to be configured independently as either input or output. The digital I/O ports default to the input state

(high impedance) on power up or reset.

Counter/timer I/O

The PCI-DAS1602/16 provides two counter 82C54 counter chips. Each chip contains three 16-bit down

counters that provide clock, gate, and output connections. You can connect the counter clock to the on-board

10 MHz crystal oscillator, or leave unconnected for user input.

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Measurement-computing PCI-DAS1602/16 Manuel d'utilisateur Page 18