Another decibel rating, dBi, is defined as an antenna’s forward gain compared to an idealized isotropic
antenna. Typically, dBm = dBi = dBd + 2.15 where dBi refers to an isotropic decibel, dBd is a dipole
decibel, and dBm is relative to milliwatts.
deep sleep
mode
Potted Puck models, potted M-GAGE models: Some battery-powered M-GAGE radios ship in a "deep
sleep" mode to conserve battery power. While in "deep sleep" mode, the M-GAGE does not attempt to
transmit to a parent radio and remains in "deep sleep" until an LED light at the receiving window wakes
it up. M-GAGEs that ship in "deep sleep" mode are typically the potted M-GAGEs that require an LED
Optical Commissioning Device to configure the M-GAGE.
Wireless Q45 Sensors: If the Wireless Q45 Sensor fails to communicate with the Gateway for more than
5 minutes, it enters sleep mode. The radio continues to search for the Gateway at a slower rate and the
LEDs do not blink. To wake up the sensor, press any button. After the Q45 wakes up, it will do a fast
rate search for the Gateway for five more minutes.
default output
conditions/
triggers
Default output conditions/triggers are the conditions that drive outputs to defined states. Example
default output conditions include when radios are out of sync, when a device cycles power, or during a
host communication timeout.
Device Power Up—Power-up events occur every time the device is powered up.
Out of Sync—Out-of-sync events occur when the radio is out of sync with its master radio.
Host Link Failure—Host link failure is when the defined timeout period has elapsed with no
communications between the host system (or Modbus master device) and the DX80 Gateway, typically
about four seconds. These events trigger when a host link failure has been detected.
Node Link Failure—Node link failures are determined by the polling interval or the out-of-sync timing.
When a Node detects a communications failure with the Gateway and the Node Link Failure flag is set,
the output points are set to the user-defined states and the inputs are frozen.
Gateway Link Failure—Gateway link failures are determined by three global parameters: Polling Interval,
Maximum Missed Message Count and Re-link Count. When the Node’s Gateway Link Failure flag is set
and the Gateway determines a timeout condition exists for a Node, any outputs linked from the failing
Node are set to the user-defined default state.
default output
value
Default output values are specific values written to output registers. For discrete outputs, this is a 1 (on)
or 0 (off) value. For analog outputs the value can be any valid register value. When a default condition
occurs, these default output values are written to the output register.
delta
The delta parameter defines the change required between sample points of an analog input before the
analog input reports a new value. To turn off this option, set the Delta value to 0.
determinism
A deterministic system defines how network endpoints behave during the loss of communications. The
network identifies when the communications link is lost and sets relevant outputs to user-defined
conditions. Once the radio signal is re-established, the network returns to normal operation.
device, node, or
radio address/ID
(DX80
Networks)
The Node address is a unique identifier for each wireless device on a network and is set using the rotary
dials. For the DX80 networks, Gateways are identified as device 0. Nodes are assigned addresses
(NADR) from 01 to 47 using the rotary dials.
directional
antenna
A direction antenna, or Yagi, is an antenna that focuses the majority of the signal energy in one specific
direction.
Direct Sequence
Spread
Spectrum
(DSSS)
Direct Sequence Spread Spectrum is a method for generating spread spectrum transmissions where
the transmitted signal is sent at a much higher frequency than the original signal, spreading the energy
over a much wider band. The receiver is able to de-spread the transmission and filter the original
message. DSSS is useful for sending large amounts of data in low to medium interference
environments.
Sure Cross
®
Performance DX80 Wireless I/O Networks
www.bannerengineering.com - Tel: + 1 888 373 6767
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