SMA connector
An SMA connector (SubMiniature version A) is a 50 ohm impedance connector used for coaxial RF
connections and developed in the 1960s. An SMA connector is typically used between the radio and the
antenna.
spread
spectrum
Spread spectrum is a technique in which the transmitter sends (or spreads) a signal over a wide range
of frequencies. The receiver then concentrates the frequencies to recover the information. The Sure
Cross radio devices use a version of spread spectrum technology called Frequency Hop Spread
Spectrum.
star networks
A star topology network is a point to multipoint network that places the network master radio in a center
or hub position. Slave radios only transmit messages to the master radio, not to each other. These
network layouts can be very flexible and typically operate relatively quickly. Slave radios acknowledge
receipt of messages transmitted from the master radio.
For more information on Banner's star network products, refer to the Sure Cross Performance DX80
Wireless I/O Network Instruction Manual (p/n
)
switch power
Efficient power management technology enables some
Flex
Power devices to include an internal power
output supply, called switch power (SP), that briefly steps up to power sensors (ideally, 4 to 20 mA loop-
powered sensors). The warmup time denotes how long the sensor must be powered before a reliable
reading can be taken. After the warmup time has passed, the input reads the sensor, then the switched
power shuts off to prolong battery life.
system
operating
margin (fade
margin)
The system operating margin, or fade margin, is the difference between the received signal level (in
dBm) and the receiver sensitivity (also in dBm) required for reliable reception. It is recommended that
the receiver sensitivity be more than 10 dBm less than the received signal level. For example, if the
signal is about –65 dB after traveling through the air and the radio receiver is rated for -85 dB, the
operating margin is 20 dB — an excellent margin.
tau filter
Set to zero (0) to turn off the tau filter. Set to 1 (weakest filter) through 6 (strongest filter) to turn on the
tau filter. (In the DX80 products, the Low Pass Filter is a combination of the median filter and the tau
filter.)
TCP/IP
TCP/IP stands for Transfer Control Protocol / Internet Protocol and describe several layers in the OSI
model that control the transfer and addressing of information.
time-division
multiple access
(TDMA)
TDMA is a wireless network communication architecture that provides a given slot of time for each
device on the network, providing a guaranteed opportunity for each device to transmit to the wireless
network master device.
thermistor
A thermistor is a temperature-sensitive resistor that changes resistance based on temperature
fluctuation.
thermocouple
A thermocouple is a temperature measuring device consisting of two dissimilar metals joined together so
that the difference in voltage can be measured. Voltage changes in proportion to temperature, therefore
the voltage difference indicates a temperature difference.
The different “types” of thermocouples use different metal pairs for accuracy over different temperature
ranges. Thermocouples are inexpensive, relatively interchangeable, have standard connectors, and
have a wide temperature range of operation. They can be susceptible to noise, with the wire length
affecting accuracy. Thermocouples are best suited for applications with large temperature ranges, not
for measuring small temperature changes over small ranges.
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
52
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