DAQ VXI-SC-1102 Manual de instrucciones Pagina 26

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Chapter 1 MIO and AI Devices
©
National Instruments Corporation 1-9 DAQ Hardware Overview Guide
E Series Digital I/O
The E Series devices contain one 8-bit digital I/O port supplied by the
DAQ-STC chip. This port is referred to as port 0 by the Digital I/O
functions.
You can configure the entire digital port as either an input or an output port,
or you can configure individual lines for either input or output. The port has
read-back capability. This port operates in nonlatched mode only.
Note
Connecting one or more AMUX-64T devices or a non-remote SCXI chassis to an
E Series device renders various lines of the digital I/O port unavailable:
One AMUX-64T device—Lines 0 and 1 are unavailable.
Two AMUX-64T devices—Lines 0, 1, and 2 are unavailable.
Four AMUX-64T devices—Lines 0, 1, 2, and 3 are unavailable.
SCXI—Lines 0, 1, 2, and 4 are unavailable.
The remaining lines of the digital I/O port are available for input or output. You should
use
DIG_Line_Config to configure these remaining lines.
The AT-MIO-16DE-10 and the 6025E devices have one 8-bit
line-configurable port named port 0 that does not support handshaking
or asynchronous operations. The DAQ-STC chip supplies this port. The
AT-MIO-16DE-10 and the 6025E devices also have three 8-bit ports named
ports 2, 3, and 4 that do support handshaking and asynchronous operations
and are directionally configurable only on a per-port basis. An 8255 chip
supplies these three ports. The three 8255 ports are numbered 2, 3, and 4
for compatibility with an older product. Table 1-2 summarizes the four
ports available on the AT-MIO-16DE-10 and the 6025E devices.
For a description of the AT-MIO-16DE-10 and the 6025E device
digital I/O, see Chapter 9, DIO-24 (6503), AT-MIO-16DE-10, and 6025E
Devices.
Table 1-2.
AT-MIO-16DE-10 and 6025E Device Ports
Port Size Configuration Type Supplied by
0 8-bit Line configurable Immediate DAQ-STC chip
2 8-bit Handshaking Asynchronous or immediate 8255 chip
3 8-bit Handshaking Asynchronous or immediate 8255 chip
4 8-bit Immediate 8255 chip
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