Connector pinouts, Digital input devices, Port specifications – Sierra Wireless MP 875 User Manual

Page 58

Advertising
background image

MP875 Modem User Guide

58

2130808

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.

Figure 6-1: 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

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.

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

Advertising