Power Connections - National Instruments 6527 User Manual

Chapter 3 Making Signal Connections
Table 3-2. Signal Descriptions for 6527 I/O Connector Pins (Continued)
Pin Signal Name
83, 85, 87, 89, DIG+3.<7..0>
91, 93, 95, 97
84, 86, 88, 90, DIG–3.<7..0>
92, 94, 96, 98
67, 69, 71, 73, DIG+4.<7..0>
75, 77, 79, 81
68, 70, 72, 74, DIG–4.<7..0>
76, 78, 80, 82
51, 53, 55, 57, DIG+5.<7..0>
59, 61, 63, 65
52, 54, 56, 58, DIG–5.<7..0>
60, 62, 64, 66
1
The connection is complete when the relay is closed. The connection is broken when the relay is open.

Power Connections

Warning
power supply. Never connect a +5 V power pin directly to GND. Never connect a +5 V or
GND pin to any other voltage source; doing so can lead to injury. National Instruments is
not liable for any damage or injury resulting from such a connection.
6527 User Manual
Isolated output port 3, first terminals—Each of these is the first
of two terminals of a bidirectional solid-state relay
(data bit of 0) closes the relay.
Isolated output port 3, second terminals—Each of these is the
second of two terminals of a bidirectional solid-state relay.
A logic low (data bit of 0) closes the relay.
Isolated output port 4, first terminals—Each of these is the first
of two terminals of a bidirectional solid-state relay. A logic low
(data bit of 0) closes the relay.
Isolated output port 4, second terminals—Each of these is the
second of two terminals of a bidirectional solid-state relay.
A logic low (data bit of 0) closes the relay.
Isolated output port 5, first terminals—Each of these is the first
of two terminals of a bidirectional solid-state relay. A logic low
(data bit of 0) closes the relay.
Isolated output port 5, second terminals—Each of these is the
second of two terminals of a bidirectional solid-state relay.
A logic low (data bit of 0) closes the relay.
Four of the pins on the I/O connector are not isolated. Pin 50 and pin 100
connect to GND, the computer ground reference. Pin 49 and pin 99 of
the I/O connector supply +5 V from the computer power supply via a
self-resetting fuse. The fuse resets automatically within a few seconds after
an overcurrent condition is removed. The +5 V pins are referenced to the
GND pins and can be used to power external digital circuitry that does not
require isolation.
• Power rating: 1 A at +4.5 to +5.25 V
The power pins, +5 V and GND, are not isolated; they connect to your computer
Description
3-6
1
. A logic low
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