User's Manual

GRYPHON™ BT SH3500 OPERATION
7
3
3.2 BLUETOOTH
®
RADIO CONNECTION
During typical operation a physical radio channel is shared by a group of devices that
are synchronized to a common clock and frequency hopping pattern. One device
provides the synchronization reference and is known as the Master. All other devices
are known as Slaves. A group of devices synchronized in this fashion form a piconet.
Most Bluetooth
®
devices can be both Master or Slave. The Master will be the first unit
to initiate the connection (page procedure).
Some devices can only be Slaves (i.e. printers). They can only wait for a Bluetooth
®
Master device to initiate a connection with them.
Gryphon™ BT SH3500 can be either Master or Slave. As Master it can initiate a
connection with only one Slave device.
The blue LED and / or the beeper always indicate the reader radio connection status
(see also the Reader Status table, at page 62):
• the radio connection is signaled by the blue LED through a single blink at regular
intervals, while if the reader radio is disconnected the LED emits two short blinks
at regular intervals;
• during the initialization procedure, if the radio connection attempt is successful,
the reader emits four ascending tones;
• the radio disconnection is signaled by four descending tones.