BLUETOOTH
G108 6-60 SM
6.15.3 COMMUNICATION
Piconet
The Bluetooth wireless nodes communicate with each other in ad hoc mode. This
network configuration is called Piconet. Piconet can connect up to eight nodes.
Piconet consists of one master and seven slaves (maximum). The master controls
the ID codes of the slaves. The master also controls the radio frequency in the net.
(The frequency of Piconet is changed repeatedly.) The master can turn to a slave
and a slave can turn to the master. If the master leaves Piconet, one of the slaves
becomes the new master. This printer can only be a slave of a computer.
Frequency Hopping Spread Spectrum (FHSS)
Bluetooth divides the radio band ranging from 2,402 to 2,480 MHz into 79 channels.
Each channel is 1-MHz wide. Bluetooth changes the channel 1,600 times per
second. By doing so, the nodes on one Piconet avoid interference with other nodes
on other Piconets located on the same LAN even if they use the same radio band.
Time
Frequency
Channel 1
Channel 2
Channel 3
G108D969.WMF
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