13
© Sealevel Systems, Inc. 3710 Manual | SL9128 7/2021
Increasing the input resistor accordingly can increase the maximum input voltage. Because socketed DIP
resistors are utilized, they can easily be replaced with a different value. Sealevel, if necessary can do this.
The input circuits are not intended for monitoring 120-volt AC circuits. In addition to being too high
a voltage for the circuits, it is dangerous to have that high a voltage on the card.
Input Pin Assignments (P2)
Port A Bit
P2
DB-37
Port B Bit
P2
DB-37
0
36
18
35
37
0
20
29
19
10
1
34
17
33
36
1
18
28
17
9
2
32
16
31
35
2
16
27
15
8
3
30
15
29
34
3
14
26
13
7
4
28
14
27
33
4
12
25
11
6
5
26
13
25
32
5
10
24
9
5
6
24
12
23
31
6
8
23
7
4
7
22
11
21
30
7
6
22
5
3
Ground
4
21
3
2
2
20
+ 12 Volts
1
1
+ 5 Volts
37
19
Reading the Inputs
The inputs are active Low. If no voltage is applied across one of the differential inputs it returns a one on
that bit. If an AC or DC voltage (of sufficient magnitude, covered above) is applied it returns a zero on that
bit.
Function Available
Port
Address Hex
R
A
Base + 0
R
B
Base + 1
R = Read
