SATO CL408e Rfid Manual page 42

Mobile Inventory Vehicle
Vehicle equipped with a system for locating tagged vehicles, containers, and other objects
for the purpose of inventory control.
Modulation
The methods of modulating or altering the carriers in order to carry the encoded
information are quite varied. They include amplitude modulation (AM)/ phase modulation
(PM), frequency modulation (FM), frequency shift keyed (FSK), pulse position (PPM),
pulse duration (PDM) and continuous wave (CW). In some cases, different modulating
techniques are used in each direction (to and from the tags).
Modulation, amplitude (AM)
Data is contained in changes in amplitude of the carrier.
Modulation, phase (PM)
Data is contained in the changes in the phase of the carrier.
Modulation, frequency (FM)
Data is contained in the changes in the frequency of the carrier.
Modulation, frequency shift keyed (FSK)
Data is contained in the changes between two frequencies of carrier.
Modulation, pulse duration (PDM)
Data is contained in the duration of pulses.
Modulation, pulse position (PPM)
Data is contained in the position of pulses relative to a reference point.
Modulation, continuous wave (CW)
Data is contained in a carrier which is switched on and off.
Multiplexer (multiplexor)
A device which supports multiple scanners or antennas by checking each in accordance
with some scheduling scheme which may be either round robin or priority based. This
reduces the total amount of electronics in the system at the expense of having all
scanners being "blind" part of the time. These devices are called multiplexers or
multichannel readers or just controllers.
Nominal
The value at which a system is designed assures optimal operation. Tolerance considers
the "normal" deviation of variable factors.
Nominal Range
The range at which a systems can assure reliable operation, considering the normal
variability of the environment in which it is used.
Version 0.8 21/10/2004 Page 41 of 44