30 | ni.com | NI Digital Waveform Generator/Analyzer Getting Started Guide
NI 656x Front Panels and Connectors
The NI 656x 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.
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