Measurement Computing PCI-DAS1602/12 - Manual (Page 19)

PCI-DAS1602/12 User's Guide Functional Details
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Analog outputs
The PCI-DAS1602/12 provides two channels of high-speed 12-bit analog output. The analog outputs are
updated via an on-board FIFO and REP OUTSW commands and provide a 250 kHz maximum update rate.
Software selectable output ranges are 0 to 10 V, 0 to 5 V, ±10 V, and ±5 V. Channels may be set at different
ranges. The D/A outputs provide rated accuracy to ±5 mA, are short circuit protected (25 mA limit) and are
cleared to 0 volts on power up or reset.
Parallel digital I/O
The PCI-DAS1602/12 provides 24 bits of parallel, digital I/O in the form of two eight-bit ports, and two four-
bit ports. This digital capability is based on an on-board 82C55 PIA chip, which allows each of the ports to be
set independently as input or output. The ports default to the input state (high impedance) on power up or reset.
Counter/timer I/O
The PCI-DAS1602/12 provides three 16-bit down counters (one third of an 82C54 chip). The counters provide
clock, gate and output connections. The counter clock may also be connected to the on-board 10 MHz crystal
oscillator or may be left uncommitted for user input.