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Recording Equipment
NI VISION PCI-8254R
User manual
Transmission Line Effects - National Instruments PCI-8254R User Manual
Ieee 1394a interface device with reconfigurable i/o
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Quick start manual
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National Instruments
PCI-8254R
User Manual
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Transmission Line Effects
Transmission line effects can degrade the signals on the I/O cables and
cause instability. To minimize transmission line effects, use twisted pair
wires with a characteristic impedance of 118 Ω to connect external signals
to the 44-pin I/O D-SUB connector.
Figure 2-8 shows connections to the 44-pin D-SUB connector that
minimize transmission line effects.
When connecting to TTL inputs on the NI 8254R, match the output
impedance of the transmitting device to the characteristic impedance of the
cable. For example, if the cable characteristic impedance is 118 Ω, make R
equal to 118 Ω, as shown in the figure above.
© National Instruments Corporation
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
TTL OUT(0)
+5 V
TTL IN(0)
NI 8254R
Figure 2-8. Connections to the 44-pin D-SUB connector
2-15
Chapter 2
Hardware Overview
44-Pin
DSUB
3
Receiving
2
Equipment
R
S
16
17
Transmitting
Equipment
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