Prontonet IP Decoder User Manual v5.4.1.1.doc
11
II.3.4
GPIO Port
A sub-D 25 ways connector provides a general purpose connection with 7 inputs
and 7 outputs. The connections must be wired according to the following
diagram:
1
2
3
4
5
15
9
6
7
8
16
17
18
19
20
10
11
12
13
25
24
23
22
21
14
N
C
N
C
N
C
N
C
O
U
T
1
O
U
T
3
O
U
T
5
O
U
T
7
N
C
O
U
T
2
O
U
T
4
O
U
T
6
G
N
D
V
C
C
N
C
IN
2
IN
4
IN
6
N
C
N
C
IN
1
G
N
D
IN
3
IN
5
IN
7
Pin
Function
Pin
Function
1
+5VDC
14
IN 7
2
IN 6
15
IN 5
3
IN 4
16
IN 3
4
IN 2
17
IN 1
5
NC
18
NC
6
NC
19
NC
7
GND
20
GND
8
OUT 7
21
OUT 6
9
OUT 5
22
OUT 4
10
OUT 3
23
OUT 2
11
OUT 1
24
NC
12
NC
25
NC
13
NC
Pin 1 is connected to +5 volts. If you need it , run this power supply through
your device with a resistor in series to limit the maximum current to 300 mA.
II.3.4.1.
Inputs
The inputs are active for grounding (active low).
II.3.4.2.
Outputs
The outputs are “open collector”. They allow an output of 5VDC on one pin to
facilitate interconnection with the outputs. Each output supports up to a
maximum of 40VDC / 40 mA and will require a pull-up resistor to function with
other logic inputs. An appropriate value is 2.2 Kohms.
