User's Manual

VIBCONNECT RF 11.2011

Operating cycle: measuring, sending, idling

The sensor unit performs the measuring tasks at preset intervals,

sends the data and then returns to idle to save energy.

Event-controlled measurement

In addition to the time-controlled measurements, the sensor unit

can be conﬁgured to perform vibration measurements based on

events. In this mode, the sensor unit continuously monitors the

respective measuring channel and automatically starts a measure-

ment when the vibration exceeds a preset level (0-p). The power

consumption for continuous monitoring is lower than that for

actual measurements. For technical reasons, only one event-

controlled measurement can be performed within the interval

between two time-controlled measurements. The triggering con-

ditions for each measuring task are set in OMNITREND.

Measuring time, transmission time, idle time

Each measuring sequence takes about 3 seconds, while the send-

ing of the data might take up to 30 seconds. The duration of the

idle phase is set in OMNITREND for each sensor unit to a time

between 30 minutes and 1 week.

To explain the function of a sensor unit in a radio cell, a number

of typical scenarios are described below in the form of questions

and answers.

How does the bridge detect a sensor unit?

• Each sensor unit is assigned a unique code, known as the MAC

address. This code is pre-programmed in the radio module and

cannot be altered. A sensor unit is assigned to a bridge in the

OMNITREND software, using its MAC address.

Note

The MAC address of a sensor unit is engraved in its cover. In addi-

tion, each sensor unit is equipped with an adhesive label bearing

the MAC address that is used for the conﬁguration of the measur-

ing point database (see also “Installing sensor unit”, page 40).

System description