Contec CNT24-4D(PCI)H, User Manual, Page: 69 / 71

6. About Hardware
62
CNT24-4D(PCI)H
*2 This board requires power supply at +5V from an expansion slot (it does not work on a machine with a +3.3V power
supply alone).
*3 The size of board No.7294, No.7294A, and No.7294B is 176.41 (L) x 105.68 (H) mm.
Board Dimensions
The standard outside dimension (L) is
the distance from the end of the board
to the outer surface of the slot cover.
[mm]
121.69(L)
105.
68(
H
)
Block Diagram
CNT24-4D(PCI)H
PC
I
B
us
I
nt
er
fa
ce
24-bit readout register
24-bit counter
24-bit comparator
24-bit compare register
One-shot pulse output
20MHz system clock
Line-receiver
input x 4 channels
TTL-level
input x 4 channels
One-shot pulse
output x 4 channels
(TTL-level output or
open-collector output
can be selected.)
PC
I
B
us
16-bit, sampling-clock counter
for digital filter
S
el
ec
to
r
D
ig
it
al
fi
lt
er
B
uf
fe
r
Figure 6.1. Block Diagram