User Manual

Asset-Link 250 User Manual July 19, 2004

970-00047 Rev. 1.2

Table 3-1 DB-25 Application I/O Connector Pin-Out

3.2 Power Input Specifications

3.2.1 Power Requirements

The Asset-Link unit operates from either a 12V or 24V DC electrical system over a

permissible range as shown in Table 3-2 and Table 3-3.

Parameter Rating Unit

Input Voltage -24 to 36 V DC

Table 3-2 Asset Power - Absolute Maximum Ratings

Parameter Min Typ Max Unit

Input voltage 7 - 36 V

Input current (TBD) - (TBD) A

Table 3-3 Asset Power Characteristics

3.2.2 Power Consumption Profile

Mode Typical Current Details

Power-Off

35uA (TBD) In this mode the unit will wake up every 2-63 seconds

for about 200 msec for activity check.

Active

Listening without GPS - TBD

Listening with GPS - TBD

Transmit (GSM or AMPs - TBD)

In this mode, the device continually checks for the

following:

i. Listen for FOCC messages (when Ears-

On)

ii. Check asset battery voltage

iii. Check I/O status and serial port.

iv. check exception, schedule and run meter

v. Update GPS fix (when GPS On)

Table 3-4 Power Consumption

3.2.3 Grounding Precautions

The negative connection (VIN_NEG from pins 24 & 12) should be chassis grounded

via two separate wires. One connected to a clean chassis point near the connection for

the positive power supply source (VIN_POS pins 25 & 13) and the other done at a

separate location from the other chassis ground connection to ensure a redundant

ground is available. This will prevent erroneous voltages on the digital outputs, and

allow the relay drivers to operate even if one connection is not a low impedance to