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2
Connector Pins Configuration
Table 2-1
68-pin VHDCI connector pins descriptions
Signal Name
AI_GND
For 16 Channels: AI<101..116>
For 64 Channels: AI<101..164>
AI_SENSE
EXTA_TRIG
AO201
AO202
AO_EXT_REF
AO_GND
EXTD_AO_TRIG
EXTD_AI_TRIG
RESERVED
COUNT<301,302>_CLK
COUNT<301,302>_GATE
COUNT<301,302>_OUT
COUNT<301,302>_UPDOWN
EXT_TIMEBASE
30
Direction
Reference
Ground
N/A
N/A
Input
AI_GND
Input
AI_GND
Input
AI_GND
Output
AO_GND
Output
AO_GND
Input
AO_GND
N/A
N/A
Input
D_GND
Input
D_GND
Output
N/A
Input
D_GND
Input
D_GND
Input
D_GND
Input
D_GND
Input
D_GND
Description
Analog input (AI) ground. All three ground
references (AI_GND, AO_GND, and D_GND) are
connected together on board.
U2351A/U2352A/U2353A/U2354A
Analog input channels 101~116. Each channel pair,
AI<i, i+8>(i = 101..108), can be configured either as two
single-ended inputs or one differential input (marked as
AIH<101..108> and AIL<101..108>).
U2331A/U2356A/U2355A
Analog input channels 101~164). Each channel pair,
AI<i, i+32> (i = 101..132), is configured either as two
single-ended inputs or one differential input (marked as
AIH<101..132> and AIL<101..132>)
Analog input sense. The reference pin for any
AI<101..116> or AI<101..164> channels in NRSE input
configuration.
External AI analog trigger
Analog output channel 1
Analog output channel 2
External reference for AO channels
Analog ground for AO
External AO waveform trigger
External AI digital trigger
Reserved pins. Do not connect them to any signal.
Source of counter <301,302>
Gate of counter <301,302>
Output of counter <301,302>
Up/Down of counter <301,302>
External Timebase
Keysight U2300A Series User's Guide
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