Measurement Specialties PMD-1024HLS - Manual (Page 15)

PMD-1024HLS User's Guide Functional Details
20
C
T
R
19
G
N
D
18
G
N
D
17
G
N
D
16
G
N
D
15 14
U
S
B
+
5
V
13 12
G
N
D
11
P
o
rt
C
Pu
ll-u
p
/
P
u
ll-d
ow
n
10
U
S
B
+
5
V
9G
N
D
8P
o
rt
C
7
Por
t A
P
u
ll-
up
/
Pu
ll-
d
ow
n
P
o
rt
B
P
ul
l-u
p /
Pu
ll-
dow
n
7P
o
rt
C
6
6P
o
rt
C
5
5P
o
rt
C
4
4P
o
rt
C
3
3P
o
rt
C
2
2P
o
rt
C
1
1P
o
rt
C
0
GN
D
4
0
GN
D
3
1
U
SB +
5 V
3
0
GN
D
2
9
Po
rt
A
7
2
8
Po
rt
B
7
3
9
Po
rt
B
6
3
8
Po
rt
B
5
3
7
Po
rt
B
4
3
6
Po
rt
B
3
3
5
Po
rt
B
2
3
4
Po
rt
B
1
3
3
Po
rt
B
0
3
2
Po
rt
A
6
2
7
Po
rt
A
5
2
6
Po
rt
A
4
2
5
Po
rt
A
3
2
4
Po
rt
A
2
2
3
Po
rt
A
1
2
2
Po
rt
A
0
2
1
Digital I/O terminals (Port A0 to A7, Port B0 to B7, Port C0 to C7)
Connect up to 24 digital I/O lines to the screw terminal containing pins 1 to 8 (Port C0 to Port C7), pins
21 to 28 (Port A0 to Port A7), and pins 32 to 39, (Port B0 to Port B7). Refer to the pinout diagram on
page 3-2 for the location of these pins. You can configure each digital port for either input or output.
When configured for input, you can use the PMD-1024HLS digital I/O terminals to detect the state of any
TTL level input. Refer to the switch shown in Figure
and the schematic shown in . If you
set the switch to the +5 V input, Port A0 reads TRUE (1). If you move the switch to GND, Port A0 reads
FALSE.
3-3
Figure 3-3. Digital connection of Port A0 detecting the state of a switch
Figure 3-4
3-3