Sierra Wireless AirLink MP890 Podręcznik Użytkownika Pobierz pdf (Strona 44)

AirLink MP User Guide

36 2130795

Figure 4-11: Wiring for using Pin 3 (digital output) as an electronic switch. Pin 10 is Ground.

The digital I/O ports provide open-collector output to a maximum of 500 mA.

Analog input devices

Analog input devices are those that generate a signal of varying voltage, based

on the state of an instrument or gauge. An example of an analog input device

might be a sensor that detects the vehicle’s speed.

An analog input can be connected to four of the pins on the DB15HD connector:

Pins 7, 8, 14, and 15.

Typically an analog input device should be connected between Ground (pin 10)

and the input port (Pin 7, 8, 14, or 15).

Figure 4-12: A sensor wired to Pin 7 (analog input) and Pin 10 (Ground).

The analog input ports use a 10-bit (1024-step) analog-to-digital converter over a

range from 0 to 3.45 VDC, yielding a digital step resolution of 0.0032 V.

Example: analog sensor connections

An I/O cable for an analog sensor requires a wire to one of the analog input pins

(such as #7) and one wire to the Ground pin (#10).

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 66 67

Brak uwag

Sierra Wireless AirLink MP890 Podręcznik Użytkownika Strona 44