Qualcomm OBDII J1708 User Manual download pdf (Page 8)

SI-VEU 3.0

Vehicle Enterprise Unit

Page 8 of 11

The connectors as numbered in figure 1 are listed below in detail:

1. Digital I/O, Emergency and Odometer

The SI-VEU3.0 features five general-purpose inputs. These input lines can detect digital

pulses (e.g. button presses) and have internal protection against over-voltage. The SI-

VEU3.0 also has four general-purpose outputs, which can source up to 0.2A each. These

lines are accessible through a dual row 6x2 Molex Minifit Jr. Connector.

Apart from the general-purpose I/O, the SI-VEU3.0 has three other digital input lines:

two for odometer reading, and one to detect if the emergency button is activated. When

the emergency button is pressed, the unit automatically dials the dispatch office (via the

cellular modem) and transmits cabin audio through a concealed microphone. There are

two inputs to determine the vehicle speed. The Wheel Tick line requires positive input

pulses to detect the speed and the Variable Reluctance line senses the change in the

reluctance in the engine to determine the speed of the vehicle.

The pin-outs are as shown in the table below in Table2 and Table3.

12 11 10 9 8 7

6 5 4 3 2 1

Table 2. Pin-outs on the Digital I/O Connector

Pin # Description

1 GND

2 Variable Reluctance

(Odometer)

3 Digital Input 4

4 Digital Input 3

5 Digital Input 2

6 Digital Input 1

7 Emergency

8 Wheel Tick (Odometer)

9 Digital Output 4

10 Digital Output 3

11 Digital Output 2

12 Digital Output 1

Table 3. Pin Descriptions of the Digital I/O Connector

1 2 3 4 5 6 7 8 9 10 11

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Qualcomm OBDII J1708 User Manual Page 8