DeviceNet Glossary
Noise:
P-P:
Ripple:
Terminator:
Transceiver:
Transient:
An undesirable intermittent voltage on a network
signal or power wire.
Peak to peak measurements of varying voltage
signals indicate the difference between the minimum and
maximum values within a specific interval.
A regular, repeated deviation from the mean
voltage of a power or signal conductor.
1) A resistor connected at the end of a
transmission line (network cable) to prevent signal
reflections caused by impedance mismatches.
DeviceNet requires two 120 ohm terminators, one at
each end of the network. DeviceNet terminating resistors
also define the recessive state of the network by
ensuring that CANH and CANL return to zero differential
after a dominant bit.
A transceiver is a circuit (typically a chip)
that converts digital bits to/from the differential voltages
on the network cable. Transceiver is a contraction of
mitter and re
.
A temporary deviation from the mean voltage
of a power or signal conductor.
trans
ceiver
The NetMeter has two
configuration switches located
in the battery compartment.
The Meter Power switch (on left)
selects between bus/battery power (powered by bus
when available) and battery only power. Selecting
battery only power eliminates the possibility of
inadvertently contributing to common mode voltage
problems on extremely long networks but limits NetMeter
use to about 7 hours on fresh batteries..
The Alarm Sound switch (on right) enables and disables
the “beep on error/transient” feature. With this feature
enabled NetMeter beeps each time a bus error or
transient occurs when the selector switch is in the
corresponding position.
Switch Settings
24
Alarm
Sound
Meter
Bus/Battery
Battery Only
Power
Off
On
