Product Info
Table Of Contents
- 1 Introduction
- 2Hardware Design
- 2.1Basic Hardware
- GPS
- GPIO
- LED’s
- UART
- Relay Driver
- Power and Battery
- Timers
- Watchdog
- Accelerometer
- 2.2 Basic RF Performance
- 2.3Certification and Safety
- 3Software Features
- 3.1Basic Software
- 3.2 Remote Update
- 3.3 Power Modes
- 3.4 AT Commands
- 3.5 Ack’ed Mode
- 3.6 Event Report Format
- 3.7 Reset
- 3.7.1 Context Preservation
- 3.8 Startup Banner
- 4Test Method
- 4.1Hardware
- 4.2Software Test
- Mechanical Structure (mm)
- FCC Statement
- RF Exposure Warning Statements:
- IC STATEMENT
6
are outside the scope of this document.
GPIO
One dedicated input, two dedicated outputs, and one general purpose IO are presented to the
external
environment
on the main connector. They are capable of providing system interrupts to
generate a report or drive logic levels to external devices. These lines are 3.3V logic level and are
30V tolerant. These pins default to input and are pulled down representing 0 when disconnected.
They should be asserted to a known value if used.
LED’s
Two LED status indicators are provided to verify correct installation and operation. The status
LEDs are color coded and directly convey the status of the cellular and GPS subsystems as
described in the table below. Their valid operation also indicates operational status and power.
LED
Function
Status
Red
GPS
On: GPS satellites acquired and Locked
Flash Slow: GPS satellite search is in progress
30 Sec Blink: Device in low power mode
Off: No power or GPS subsystem fault
Green
Cellular
Connection
On: Indicates LTE connection is made
Flash Slow: LTE subsystem initialization in progress
Flash Fast: LTE initialization but no data connection available
Off: No power, Low power mode or LTE subsystem fault
The WCM provides user control allowing the LEDs to be extinguished once installation is verified.
This feature reduces power and further conceals the WCM Tracker from untrained parties wishing
to defeat its operation.
UART
There is one UART provided. A debug UART port is provided for AT commands, data interaction
and optionally for application specific control.
Relay Driver
A 500mA sink capable output pin is provided. This pin is meant to drive a relay coil indented to
interrupt the starter solenoid relay for the ignition circuit to a car.
Power and Battery
The battery monitor is internal analog input scaled such that the DC value of the power input pin
to the WCM system is measured. This value is scaled to span the most significant 8 bits of the A/D