B&B Electronics LDVDSV2-S-P9D - Manual - Manual (Page 8)

OBDII Streamer Command & Response
V2.11
Page 8/49
Second, most vehicles stop responding to OBDII requests when the ignition is off. After
20 seconds of no responses from the vehicle the OBDII Streamer will enter Standby
mode.
The OBDII Streamer polls the vehicle for ignition status every two seconds. When the
ignition status changes from off to on the device will return to normal mode and will send
an ignition status message to the host.
Low Power Modes
Standby Mode:
During Standby Mode the vehicle is polled periodically to find out its ignition status.
Standby Mode will be the default mode used.
Standby Mode is entered within 20 seconds of communications loss.
Standby Mode is entered within 2 minutes of 0 RPM and 0 Vehicle Speed
(Vehicle Speed was added as a condition because a hybrid vehicle can turn the
engine off and be running on the electric engine).
Standby Mode is exited within ten seconds after vehicle starts communicating
LDV Streamer remains partially responsive to some communications while in
Standby Mode.
Maximum Power Consumption: 0.42W.
Maximum Time from power-on to valid vehicle data: fifteen seconds when
vehicle is running.
When the vehicle’s battery voltage is below 12.6V the vehicle is no longer polled
to save more power. When the ignition is turned on the alternator will increase
the voltage above 12.6V and the maximum time to normal running mode will be
met.
Special Cases:
First Time Installation: The OBDII Streamer does not enter any low power
modes until it has been installed on a vehicle and has detected the supported
parameters.
Firmware updates: After a firmware update, the OBDII Streamer will go into
the appropriate power state for normal operation.
Unintentional Reset (Battery removal, brownout, etc.): After an unintentional
reset, the OBDII Streamer will go into the appropriate power state for normal
operation.
Move to Different Vehicle:
• The LDV Streamer should remain in the appropriate low power mode
until it has been determined that the engine is running.
• The LDV Streamer requires a REDETECT_VEHICLE command to
work properly after moving to a different vehicle.