National Instruments 3.21E+04 用户手册
Chapter 3 Hardware Overview
National Instruments Corporation
3-19
AT-MIO/AI E Series User Manual
Digital I/O
The AT E Series boards contain eight lines of digital I/O for
general-purpose use. You can individually configure each line through
software for either input or output. The AT-MIO-16DE-10 has 24
additional DIO lines, configured as three 8-bit ports: PA<0..7>,
PB<0..7>, and PC<0..7>. You can configure each port for both input and
output in various combinations, with some handshaking capabilities. At
system startup and reset, the digital I/O ports are all high impedance.
general-purpose use. You can individually configure each line through
software for either input or output. The AT-MIO-16DE-10 has 24
additional DIO lines, configured as three 8-bit ports: PA<0..7>,
PB<0..7>, and PC<0..7>. You can configure each port for both input and
output in various combinations, with some handshaking capabilities. At
system startup and reset, the digital I/O ports are all high impedance.
The hardware up/down control for general-purpose counters 0 and 1 are
connected onboard to DIO6 and DIO7, respectively. Thus, you can use
DIO6 and DIO7 to control the general-purpose counters. The up/down
control signals are input only and do not affect the operation of the DIO
lines.
connected onboard to DIO6 and DIO7, respectively. Thus, you can use
DIO6 and DIO7 to control the general-purpose counters. The up/down
control signals are input only and do not affect the operation of the DIO
lines.
Timing Signal Routing
The DAQ-STC provides a very flexible interface for connecting timing
signals to other boards or external circuitry. Your AT E Series board
uses the RTSI bus for interconnecting timing signals between boards
and the Programmable Function Input (PFI) pins on the I/O connector
for connecting to external circuitry. These connections are designed to
enable the AT E Series board to both control and be controlled by other
boards and circuits.
signals to other boards or external circuitry. Your AT E Series board
uses the RTSI bus for interconnecting timing signals between boards
and the Programmable Function Input (PFI) pins on the I/O connector
for connecting to external circuitry. These connections are designed to
enable the AT E Series board to both control and be controlled by other
boards and circuits.
There are a total of 13 timing signals internal to the DAQ-STC that can
be controlled by an external source. These timing signals can also be
controlled by signals generated internally to the DAQ-STC, and these
selections are fully software configurable. For example, the signal
routing multiplexer for controlling the CONVERT* signal is shown in
Figure 3-14.
be controlled by an external source. These timing signals can also be
controlled by signals generated internally to the DAQ-STC, and these
selections are fully software configurable. For example, the signal
routing multiplexer for controlling the CONVERT* signal is shown in
Figure 3-14.