User guide

AirLink MP User Guide
34 2130795
Connector pinouts
The MP modem’s I/O port is a female DB15HD connector with eight active I/O
pins:
• Two ( 2) digital I/O pins.
• Two ( 2) digital input pins.
• Four (4) analog input pins.
There are also six reserved pins and one ground pin.
Figure 4-9: Pinouts for a male DB15HD I/O cable (left) that connects to the MP modem’s female
DB15HD I/O connector (right). Note that the two figures’ pinouts are mirror images of each other,
since they plug into one another.
Port specifications
Note: No more than
36 VDC should be applied
to any I/O pins.
See I/O port characteristics on page 75 for the technical specifications of the I/O
ports, including input voltages.
Digital input devices
Digital input devices are those that have only two states and send a signal to the
MP modem in one of those states. An example of a digital input device might be a
gun rack alarm that sends a signal to the MP modem any time the gun rack is
open. Another example would be a panic button that sends a signal to the MP
modem when it is pushed.
A digital input can be connected to four of the pins on the DB15HD connector:
Pins 3, 4, 11, and 12. (Pins 3 and 11 could alternatively be used for digital
output.)
2. Reserved—do not connect
3. Digital Input/Output 1
4. Digital Input 3
5.
Reserved—do not connect
6. Reserved—do not connect
7. Analog Input 2
8. Analog Input 4
9.
Reserved—do not connect
10. Ground (GND)
11. Digital Input/Output 2
12. Digital Input 4
13.
Reserved—do not connect
14. Analog Input 1
15. Analog Input 3
1. Reserved—do not connect
1
6
5
11
10
15
DB15HD female connector
DB15HD male cable
on rear of MP modem