Signal Connection Descriptions - National Instruments AT-DIO-32F User Manual

Configuration and Installation

Signal Connection Descriptions

Pins Signal Names
43-50 DIOB<0..7>
35-42 DIOA<0..7>
33 REQ1
31 OUT1
IN1
27 ACK1
24 REQ2
AT-DIO-32F User Manual
Description
Bidirectional data lines for Port B.
DIOB7 is the MSB; DIOB0 is the LSB.
Bidirectional data lines for Port A.
DIOA7 is the MSB; DIOA0 is the LSB.
Input handshaking request line for Group 1.
When the AT-DIO-32F is in write mode, the external
device activates this signal to indicate that it is ready
to receive data. When the AT-DIO-32F is in read
mode, the external device activates this signal if data
can be read on the data lines. The polarity of this
signal is changed by the INVRQ1 bit in the CFG1
Register.
Extra output signal #1.
This additional output signal can be connected to
extra control lines, and is controlled by the OUT1 bit
in the CFG1 Register.
Extra input signal #1.
This additional input signal is pulled up to +5 V by an
onboard resistor. The status of this signal can be
obtained by reading the IN1 bit in the STAT Register.
This input signal can be used as an extra input signal
line or as an external enable signal of Counter 1 of the
board.
Output handshaking acknowledge signal for Group 1.
When the AT-DIO-32F is in write mode, this signal
becomes active when data has been written to the data
lines. When the AT-DIO-32F is in read mode, this
signal becomes active when the available data on the
data lines has been read. The polarity of this signal is
configured by the INVACK1 bit in the CFG1
Register.
Input handshaking request line for Group 2.
When the AT-DIO-32F is in write mode, the external
device should activate this signal to indicate that it is
ready to receive data. When the AT-DIO-32F is in
read mode, the external device should activate this
signal if data is available to be read on the data lines.
The polarity of this signal is changed by the INVRQ2
bit in the CFG2 Register.
2-14 © National Instruments Corporation
Chapter 2