Connector pinouts, Digital input devices – Sierra Wireless MP 875 User Manual
Page 44
MP 875 Modem User Guide
Note: No more than 36 VDC
should be applied to any I/O
pins.
Before using the digital input/output lines, you must configure
them as inputs or outputs.
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.
1
5
6
10
11
15
DB15HD male cable
DB15HD female connector
on rear of MP modem
1.
Reserved—do not connect
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
Figure 4-1: 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
on page 62 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.
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