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NI Digital Waveform Generator/Analyzer Getting Started Guide
NI 656
x
Front Panels and Connectors
The NI 656
x
front panels contain four connectors—three SMB jacks (CLK IN, PFI 0, and
CLK OUT) and one 73-pin 12x Infiniband connector (DIGITAL DATA & CONTROL, or
DDC).
Figure 17 shows the NI 6561 front panels and pinout, which are identical to those of the
NI 6562. Signals marked with an asterisk represent the complementary terminal for the
differential signal of the same name. The DDC signals are described in Table 6. The
SMB connectors are the same as those described in Table 7, and the LEDs are the same as those
described in Tables 8 and 9.
Table 5.
NI
6556 AUX I/O
Connector Pins
Pins
Signal Name
Signal
Type
Signal Description
1
External Force
Analog
Resource for external SMU or DC
force functions.
2, 4
Guard
Analog
Guard connection for external
SMUs or DC sources.
3
External Sense
Analog
Resource for external SMU or DC
sense functions.
5
Cal
Analog
Resource used during external
calibration.
6
GND
Ground
Ground reference for external
signals.