Chapter 3
Signal Connections
© National Instruments Corporation
3-3
Table 3-2 summarizes the functions of the power connector terminals.
IEEE 1394a Connector
The IEEE 1394a connectors on the NI 8254R device provide a reliable,
high-frequency connection between the NI 8254R device and up to
two DCAM-compliant IEEE 1394 cameras. To access the IEEE 1394a
connectors on the NI 8254R device, use any standard 6-pin IEEE 1394
cable.
Note
You can use a 4-pin to 6-pin converter cable with cameras that have their own
external power supply and do not require power from the IEEE 1394 bus.
General-Purpose Digital I/O
The 44-pin D-SUB connector provides access to the general-purpose
digital inputs and outputs. The general-purpose digital I/O available on this
connector includes 2 TTL inputs, 9 TTL outputs, 13 isolated inputs, and
4 isolated outputs. For easy connection to the digital I/O connector, use the
National Instruments digital I/O cable and the NI Vision I/O Terminal
Block and Prototyping Accessory.
Note
The accessories available for use with the NI 8254R do not provide access to all
available I/O on the NI 8254R device. To access this I/O, you can create a custom cable
using a standard male 44-pin D-SUB connector.
For more information about the National Instruments digital I/O cable and
terminal block, refer to the Optional Equipment section of the
NI PCI-8254R Quick Start Guide.
Note
Isolated inputs are compatible with 5 V logic if the external circuit meets the voltage
and current requirements listed in the Specifications section of the NI PCI-8254R Quick
Start Guide.
Table 3-2. Power Connector Terminals
Terminal
Description
V
Isolated power (5 to 30 VDC)
C
Isolated common-mode signal
