Something
has changed
data
channel
A channel may be either a path for communications or a range of radio frequencies used by a
transceiver during communication.
collision
A collision is a situation in which two or more transmissions are competing to communicate on a system
that can only handle one transmission at a time. This may also be referred to as a data collision.
collocated
networks
To prevent interference between collocated wireless networks, assign each wireless network a different
Network ID. The Network ID is a unique identifier assigned to each wireless network using the rotary
dials on the Gateway.
contention
architecture
Contention architecture is a wireless communication architecture that allows all network devices access
to the communications channel at the same time. This may lead to transmission collisions.
counter - event
The event counter counts the total number of times an input signal changes to the high/ON/1 state. The
counter increments on the falling edge of an input signal when the signal level crosses the threshold.
Event counters can be used to measure the total operational cycles of a spinning shaft or the total
number of items traveling down a conveyor.
counter -
frequency
The frequency counter calculates the frequency of the input signal, in Hz.
Frequency counters can be used to measure flow rates, such as measuring the flow rate of items on a
conveyor or the speed at which a windmill spins.
cyclic reporting
Cyclic reporting is when the Gateway polls the Node at user-defined intervals.
It is time to
report
data
debounce
When a signal changes state using a mechanical switch or relay, the signal can oscillate briefly before
stabilizing to the new state. The debounce filter examines the signal’s transitions to determine the
signal’s state.
The signal oscillates between states after a mechanical switch
or relay activates.
Without a debounce filter, the signal is interpreted to change
state multiple times.
With a debounce filter, the signal is interpreted to change state
only once.
The factory default setting is to activate the input filtering to compensate for unclean state transitions.
decibel
A decibel is a logarithmic ratio between a specific value and a base value of the same unit of measure.
With respect to radio power, dBm is a ratio of power relative to 1 milliWatt. According to the following
equation, 1 mW corresponds to 0 dBm.
Equation: PmW = 10
x/10
where x is the transmitted power in dBm, or dBm = 10 log(PmW)
Sure Cross
®
Performance DX80 Wireless I/O Networks
58
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