National Instruments 653 Series User Manual page 134

H
handshaking I/O
I
I/O
interrupt
I
OL
I
OH
L
line
low/high
LSB
M
Measurement &
Automation Explorer
(MAX)
MB/s
© National Instruments Corporation
Data-transfer mode in which the NI 653X engages in a two-way
communication with the peripheral device. The NI 653X asserts a signal,
ACK, when it is ready for a data transfer and the peripheral device asserts
a separate signal, REQ, when it is ready for a data transfer. Data is
transferred only when both the NI 653X and the peripheral device are
ready.
input/output—a transfer of data to/from a computer system involving
communications channels, operator interface devices, and/or data
acquisition and control interfaces.
A computer signal indicating that the CPU should suspend its current task
to service a designated activity.
current output high—minimum amount of available current on the output
pin when the logic device is driving a logic high.
current output low—minimum amount of available current on the output
pin when the logic device is driving a logic low.
Individual digital bit.
Refers to the active, or "on" state of handshaking I/O lines. For example, if
ACK is active low, the NI 653X is ready when its ACK line asserts (changes
to) low.
least significant bit
A controlled centralized configuration environment that allows you to
configure all of your NI devices.
A unit for data transfer that means one million or 10
G-5
Glossary
6 bits per second.
NI 653X User Manual