User's Manual

V3d Product Specification, Version 2.06
3.3 Local Access and Monitoring
3.3.1 Main Serial Interface
The main serial interface provides device management, monitoring and firmware upgrade using
standard RS232 voltage levels. Serial data is carried on the Transmit (TX) and Receive (RX)
lines. The specifications are as follows:
a) Baud Rate: 115200 bps
b) Stop Bits: 1
c) Parity Bits: none
Any change in configuration will not take effect until the V3d is reset (either warm or cold boot),
or in the subsequent wake up from sleep, i.e. configuration is set in one debug session or via
OTA and unit goes to sleep. When the unit wakes up after this sleep it will check for new
configuration and the previously set configuration will take affect.
3.3.2 Device Activity Indicator
One illuminating indicator is to be located on the case to indicate device health. It is
recommended that the illumination occurs through a light pipe, so the active device can be
located on the PCB. Alternatively, the illuminating indicator may be an LED embedded in the
power switch. Also, it is preferable that the illumination is not on the same enclosure face as the
optic sensor. The operation of the indicator is as follows:
Dot = 0.5s on
Dash = 1.0s on
Space = 0.5s off
a) During normal operation the LED only illuminates for wakeup.
a. On wake from sleep: Dot
b) Upon cold boot, additional LED blink codes are added to aid in installation and
troubleshooting. The blink codes are repeated continuously until another condition is met.
Condition Blink Code
Boot Dash Dash
Successful GPS Fix (2D or 3D) Dot Dot Dash Dash
Unsuccessful GPS Fix Dash Dash Dot
Satellite Acquisition Dot Dot Dash
Successful transmission Dot Dot
Unsuccessful transmission Dash Dash
3.4 Power Management
The main processor is provided with power control of the various subsystems. This includes the
GPS receiver, the satellite modem, and the cellular modem. This high degree of control is
needed to enable very low power modes, thus reducing battery power requirements.
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