and receiver gains are positive numbers and the free space loss is a larger negative number, the total
gain of a system should be negative. A link loss calculation may also be called a link budget calculation.
peer to peer
network
Peer-to-peer is a model for a communication protocol in which any device in the network can send or
receive data. Any device can act as a Master to initiate communication.
polling interval/
rate
The Gateway communicates with, or polls, each Node to determine if the radio link is active. The polling
rate defines how often the Gateway communicates with each Node. Polling is always initiated by the
Gateway and only verifies radio signal communications.
Are you there?
Yes, I am here.
polling interval/
rate and
maximum
misses
The Gateway communicates with, or polls, each Node to determine if the radio link is active. The polling
rate, or interval, defines how often the Gateway communicates with each Node. Polling is always
initiated by the Gateway and only verifies radio signal communications. Nodes that fail to respond are
counted against the ‘Maximum Misses’ for that Node. If the ‘Maximum Misses’ is exceeded for any
Node, the Gateway generates an RF timeout error in the Modbus I/O register 8 of the appropriate Node.
The ‘Maximum Misses’ is defined as the number of consecutive polling messages that the Node fails to
respond to.
radiation
pattern
An antenna's radiation pattern is the area over which the antenna broadcasts an easily received signal.
The radiation pattern/shape changes based on the antenna type and gain.
re-link count
The re-link count is the number of completed polling messages the Gateway receives from a Node
before a lost RF link is considered re-established and normal operation resumes.
remote antenna
A remote antenna installation is any antenna not mounted directly to the Sure Cross wireless device,
especially when coaxial cable is used. Always properly install and ground surge suppressors in remote
antenna systems.
repeater radio
A repeater radio extends the transmission range of a wireless network. Repeaters are typically used in
long-distance transmission.
report interval/
rate
The report rate defines how often the Node communicates the I/O status to the Gateway. For battery-
powered applications, setting the report rate to a slower rate extends the battery life.
I/O Status
Change of state reporting sets the system to report only when the value crosses the threshold setting.
rotary dial
address mode
See:
address mode
Received Signal
Strength
Indicator (RSSI)
An RSSI is the measurement of the strength of received signals in a wireless environment. See
Site
Survey
.
resistance
temperature
detector (RTD)
An RTD is a temperature measurement device that measures the electrical resistance across a pure
metal. The most commonly used metal is platinum because of its temperature range, accuracy, and
stability.
RTDs are used for higher precision applications or for longer wire runs because RTDs can compensate
for wire length. In industrial applications, RTDs are not generally used at temperatures above 660º C.
Though RTDs are more accurate, they are slower to respond and have a smaller temperature range
than thermocouples.
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
50
www.bannerengineering.com - Tel: + 1 888 373 6767
