Chapter3 MakingSignal Connections
©NationalInstruments Corporation 3-5 6527User Manual
I/O Connector Signal Descriptions
Table3-2. SignalDescriptions for 6527 I/O Connector Pins
Pin Signal Name Description
33,35, 37, 39,
41, 43, 45, 47
DIG+0.<7..0> Isolated input port 0, positiveterminals—Take measurements
atthese terminals. These terminals should be positive relative
to their corresponding DIG–lines. A logic high (data bit of 1)
indicatesinput voltage and current are present.
34,36, 38, 40,
42, 44, 46, 48
DIG–0.<7..0> Isolatedinput port 0, negative terminals—Each of these
terminalsserves as the reference terminal from which the
corresponding DIG+ line is measured. A logic high (data bit
of1) indicatesinput voltage and current are present.
17,19, 21, 23,
25, 27, 29, 31
DIG+1.<7..0> Isolated input port 1, positiveterminals—Take measurements
atthese terminals. These terminals should be positive relative
to their corresponding DIG–lines. A logic high (data bit of 1)
indicatesinput voltage and current are present.
18,20, 22, 24,
26, 28, 30, 32
DIG–1.<7..0> Isolatedinput port 1, negative terminals—Each of these
terminalsserves as the reference terminal from which the
corresponding DIG+ line is measured. A logic high (data bit
of1) indicatesinput voltage and current are present.
1,3 , 5, 7, 9,
11, 13, 15
DIG+2.<7..0> Isolated input port 2, positiveterminals—Take measurements
atthese terminals. These terminals should be positive relative
to their corresponding DIG–lines. A logic high (data bit of 1)
indicatesinput voltage and current are present.
2,4 , 6, 8, 10,
12, 14, 16
DIG–2.<7..0> Isolatedinput port 2, negative terminals—Each of these
terminalsserves as the reference terminal from which the
corresponding DIG+ line is measured. A logic high (data bit
of1) indicatesinput voltage and current are present.
49, 99 +5V +5Volts—Thesepinsarefusedforupto1Atotalof+4.5
to +5.25 V from the computer power supply.These pins are
not isolated.
50, 100 GND Ground—These pins are connected to the computerground
reference. These pins are not isolated.