
Signal Connections 23
Legend:
Pin # Signal Name Reference Direction Description
1~4 CH<0..3>+ CH0<0..3>- Input
Differential positive
input for AI channel
<0..3>
5 EXTATRIG AIGND Input
External AI analog
trigger
6 DA0OUT AOGND Output AO channel 0
7 DA1OUT AOGND Output AO channel 1
8 AOEXTREF AOGND Input
External reference for
AO channels
9~12
SDI<3..0>_1 (2010)
NC (2005/2006/2016)
DGND Input
Synchronous digital
inputs
13 AO_TRIG_OUT DGND Output AO trigger signal
14 AI_TRIG_OUT DGND Output AI trigger signal
15,16 GPTC<0,1>_SRC DGND Input
Source of
GPTC<0,1>
17,51 GPTC<0,1>_GATE DGND Input Gate of GPTC<0,1>
18,52 GPTC<0,1>_OUT DGND Input
Output of
GPTC<0,1>
19,53 GPTC<0,1>_UPDOWN DGND Input
Up/Down of
GPTC<0,1>
20 EXTTIMEBASE DGND Input External TIMEBASE
21,28,49,
50,54,62
DGND -------- -------- Digital ground
22,56,23,
57,24,58,
25,59
PB<7,0> DGND PIO*
Programmable DIO
pins of 8255 Port B
26,60,27,
61,29,63,
30,64
PC<7,0> DGND PIO*
Programmable DIO
pins of 8255 Port C
31,65,32,
66,33,67,
34,68
PA<7,0> DGND PIO*
Programmable DIO
pins of 8255 Port A
Table 3-2: VHDCI-type (68-pin) Connector Legend
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