National Instruments AT E Series - Manual (Page 44)

Chapter 3 Hardware Overview
AT E Series User Manual 3-18 ni.com
Digital I/O
The AT E Series devices contain eight lines of DIO 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.
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.
Timing Signal Routing
The DAQ-STC provides a very flexible interface for connecting timing
signals to other devices or external circuitry. The AT E Series device uses
the RTSI bus for interconnecting timing signals between devices 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 device to both control and be controlled by other devices
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.