Programming instructions

© National Instruments Corporation 9-1 DAQ Hardware Overview Guide
9
DIO-24 (6503),
AT-MIO-16DE-10, and 6025E
Devices
This chapter contains overview information on the DIO-24 (PC-DIO-24,
PC-DIO-24PnP, DAQCard-DIO-24, 6503 devices), AT-MIO-16DE-10,
and 6025E digital I/O devices.
DIO-24 (6503), AT-MIO-16DE-10, and 6025E Digital I/O
The DIO-24 (6503), AT-MIO-16DE-10, and 6025E devices contain 24 bits
of digital I/O. These bits are divided into a set of three digital I/O ports of
eight bits each.
The digital I/O ports are labeled as ports PA, PB, and PC on the
I/O connectors, as shown in your device user manual. You can configure all
three ports as either input ports or output ports. Table 9-1 lists the port
numbers to use in the digital I/O functions.
Ports PA and PB support both handshaking and no-handshaking modes.
You can use port PC for no-handshaking mode only. The device uses the
digital lines making up port PC as handshaking lines for both ports PA and
PB whenever you configure either for handshaking mode; therefore, port
PC is not available for Digital I/O functions whenever you configure either
port PA or port PB for handshaking mode.
Table 9-1.
Digital I/O Device Port Numbers
Device Port Names Port Numbers
DIO-24 (6503) PA, PB, PC 0, 1, 2
AT-MIO-16DE-10,
6025E devices
PA, PB, PC 2, 3, 4