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the PCLD-8712 screw terminal board. The trigger signal is TTL-
compatible.
Analog Threshold Trigger
For analog input operations, an analog trigger event occurs when the
PCI-1712/1712L detects a transition from above a threshold level to
below a threshold level (falling edge), or a transition from below a
threshold level to above a threshold level (rising edge). User should
connect analog signals from external device or internal analog output
channel on board to external screw terminal ANA_TRG on the PCLD-
8712 screw terminal board.
On the PCI-1712/1712L, the threshold level is set using a dedicated 8-
bit DAC; the hysteresis is fixed at 50 mV. Using software, you can
program the threshold level by writing a voltage value to this DAC;
this value can range from -10 V to +10 V.
A
D /
o c
e d
H
e
. x
0 0
h 0
F 7
h F
2
0 8
h 0
2
F
F
h F
4
1
L
S
B
Table 5-3: The corresponding Full Scale values for various Input
G
a
n i
0
5 .
1
2
4
8
0
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Table 5-2: Analog Input Data Format
D
e
. c
U
d 0
4 0
d 7
F
S
2 /
4 0
d 8
9 0
d 5
F
S
F
Voltage Ranges
U
n
p i
r a l
R
n a
e g
N
A /
N
0
~
0 1
V
0
~
5
V
0
~
2
5 .
V
2
~
. 1
5 2
V
. 1
M
p a
i p
g n
V
l o
i n
o p
r a l
0
-
1
L
S
B
F
S
2 /
-
1
L
S
B
/ S
0 4
6 9
F
S
R
n a
e g
A /
±
0 1
V
0 1
±
5
V
5
±
2
5 .
V
5 .
±
. 1
5 2
5 2
±
0
6 .
5 2
– 39 –
PCI-1712/1712L User's Manual
Chapter 5
a t
e g
i B
o p
r a l
F -
S
2 /
1 -
L
S
B
0
F
S
2 /
-
1
L
S
B
F
/ S
0 4
6 9
i B
o p
r a l
F
S
0 2
0 1
5
V
2
5 .
V
. 1
5 2
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