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National Instruments Corporation 8-1 DAQ Hardware Overview Guide
8
DIO-96 Digital I/O Devices
This chapter contains overview information on the DIO-96 digital I/O
devices, including the PC-DIO-96, PC-DIO-96PnP, PCI-DIO-96,
DAQPad-6507, DAQPad-6508, and PXI-6508.
DIO-96 Digital I/O
The DIO-96 devices contain 96 bits of digital I/O. These bits are divided
into a set of 12 digital I/O ports of eight bits each. Digital I/O on this device
is controlled by four Intel 8255A Parallel Peripheral Interface chips. The
digital I/O ports are labeled as ports APA, APB, APC, BPA, BPB, BPC,
CPA, CPB, CPC, DPA, DPB, and DPC on the I/O connector as shown in
the PC-DIO-96/PnP User Manual. You can configure all 12 ports as either
input ports or output ports.
These ports are referred to as ports 0 through 11 for the Digital I/O
functions. Table 8-1 shows which port labels map to which port numbers
and the modes you can use them in.
Table 8-1.
DIO-96 Port Labels, Numbers, and Modes
Port Label Port Number Modes
APA 0 handshaking
no-handshaking
APB 1 handshaking
no-handshaking
APC 2 no-handshaking
BPA 3 handshaking
no-handshaking
BPB 4 handshaking
no-handshaking
BPC 5 no-handshaking
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