Measurement Computing DBK70 - Manual (Page 22)

4-4 Hardware Reference 919092 DBK70 User’s Manual
Auxiliary Power Connectors
Either port can be used to supply auxiliary power
to the DBK70. When attached to a vehicle
network, the vehicle will supply adequate power
for the DBK70, so no additional power need be
connected via the Auxiliary Power Connector. To
power the DBK70 in the lab or office, disengaged
from the vehicle network, use the included
external AC supply. The 2
nd Auxiliary power
connector is used to cascade externally supplied
power to another piece of data acquisition equipment.
Power Issues
There are 2 methods for powering a DBK70; applying DC power to either of its Auxiliary Power inputs or
through the vehicle network. When connected to a running vehicle, the vehicle power received from the
diagnostic connector is all that is necessary to power the DBK70 – no further power connections are
necessary.
In rare instances where power is not available on the diagnostic connector, the DBK70 can be powered
from its Auxiliary Power connector using a cigarette lighter power cord (IOtech p/n CA-198)
The Auxiliary Power input is primarily used to operate the DBK70 when not connected to a vehicle. In
some instances, it may be preferable to configure the DBK70 outside of the vehicle, in an office or lab
setting. Use the included AC power adapter in these circumstances.
The 2 Auxiliary Power connectors are attached in parallel inside the DBK70. When power is supplied to
the DBK70 externally, the 2
nd connector can be used to cascade the power source to another piece of
equipment, like a DaqBook, WaveBook, or LogBook data acquisition product.
LED Operation
Three LEDs on the front panel of the DBK70 provide feedback as to
the current state of the unit. When sufficient power supply voltage is
supplied, the Power LED will blink. When both power is applied and
network activity is sensed, the Power LED will remain solid. If the
DBK70 is powered but not connected to the vehicle network, no
activity will be sensed, therefore the Power LED will blink.
• When connected to the network of a running vehicle and the analog outputs are configured, if the
Power LED is not solidly illuminating, it is likely that the vehicle bus is malfunctioning or the
DBK70 network interface is not operating correctly. This could be due to having the incorrect
network interface installed in the DBK70.
• The Transmit LED will flash when the DBK70 is issuing a request message onto the network. If the
Update Rate field is set to 0 and/or the Message field is blank for all desired messages, the DBK70
will never issue messages onto the network, therefore the LED will never blink.
• The Receive LED will flash whenever any desired messages have been detected. A desired message
is defined as a message that the DBK70 has been configured to capture. If the Receive LED never
flashes, the desired bus messages, defined in the fields of the database, are not being detected. This
could be due to an incorrect message definition in the database, or that the desired message needs to
be requested before it is transmitted.