COMMUNICATION PORTS, AUDIO JACK AND GPI/O WIRING
ENG
Pag. 41
PIN
DESCRIPTION
DIRECT.
PIN
DESCRIPTION
DIRECT.
1
Anode of photocoupler input 1
IN
9
Cathode of photocoupler input 1
IN
2
Anode of photocoupler input 2
IN
10
Cathode of photocoupler input 2
IN
3
Anode of photocoupler input 3
IN
11
Cathode of photocoupler input 3
IN
4
+ 12 V via 100 Ohm resistor
OUT
12 GND
/
5
+ 12 V via 100 Ohm resistor
OUT
13
Cathode of photocoupler input 4
IN
6
Anode of photocoupler input 4
IN
14
Cathode of photocoupler input 5
IN
7
Anode of photocoupler input 5
IN
15
Cathode of photocoupler input 6
IN
8
Anode of photocoupler input 6
IN
Inside the processor, a 100 ohm resistor connects the pins 4 and 5 to a +12V power supply. When nothing is
connected to the GPI input, the input voltage therefore is +12V.
Inside the processor, 470 ohm resistors also are inserted on series on each optoisolator anode (see pins 1, 2
,3, 6, 7 and 8) for current limiting. Nominal current on optoisolators is 5 mA, while the max current is 10 mA.
EXAMPLE N° 1 –activation of GP INPUT 1 by external TTL (+ 5V) command
DB-15p
MALE
470 OHM
GND
1
9
15
8
EXTERNAL
TTL COMMAND
(connector internal view)
External TTL signal must be applied through a 470 Ohm carbon resistor to the SPLIT photodiode (pins 1 and
9). Max current allowed: 10 mA. Nominal: 5 mA
EXAMPLE N° 2 – SPLIT activation by clean contact
DB-15p
MALE
INPUT 1 ACTIVATION
1
9
12
15
8
The external switch (clean contact) is used to shortcut pin 1 and pin (having pin 9 and 12 tied together)