Справочник Пользователя для National Instruments PCI-DIO-96

Chapter 3

Signal Connections

PCI-DIO-96 User Manual

3-8

 National Instruments Corporation

Pins 49 and 99 of the I/O connector supply +5 V from the computer’s 
power supply via a self-resetting fuse. The fuse will reset automatically 
within a few seconds after the overcurrent condition is removed. These 
pins are referenced to GND and can be used to power external digital 
circuitry. For more information on these output pins, see Appendix A, 
Specifications.

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Power rating

1 A at +4.65 to +5.25 V

This section lists the timing specifications for handshaking with the 
PCI-DIO-96. The handshaking lines STB* and IBF synchronize input 
transfers. The handshaking lines OBF* and ACK* synchronize output 
transfers.

Table 3-3 describes the connector pins on the PCI-DIO-96 I/O 
connector by pin number and gives the signal name and description of 
each signal connector pin.

Table 3-3.  Signal Names Used in Timing Diagrams  

STB*

Input

Strobe Input—A low signal on this handshaking line loads data 
into the input latch.

IBF

Output

Input Buffer Full—A high signal on this handshaking line 
indicates that data has been loaded into the input latch. This is 
an input acknowledge signal.

ACK*

Input

Acknowledge Input—A low signal on this handshaking line 
indicates that the data written to the port has been accepted. 
This signal is a response from the external device indicating 
that it has received the data from the PCI-DIO-96.

OBF*

Output

Output Buffer Full—A low signal on this handshaking line 
indicates that data has been written to the port.

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