Chapter 6 Using Bluetooth
Introduction
Bluetooth-equipped devices can communicate without wires, using frequency-hopping spread spectrum (FHSS)
RF to transmit and receive data in the 2.4 GHz Industry Scientific and Medical (ISM) band (802.15.1). Bluetooth
wireless technology is specifically designed for short-range (30 feet/10 meters) communications and low power
consumption.
Wearable terminals with Bluetooth capabilities can exchange information (e.g., files, appointments and tasks) with
other Bluetooth enabled devices such as headsets, printers, access points and other wearable terminals.
Zebra wearable terminals with Bluetooth technology use the StoneStreet One Bluetooth stack. To program
Bluetooth within the wearable terminal refer to the StoneStreet One SDK, available at the Zebra Support Central
web site. on the WT4000 product page.
Adaptive Frequency Hopping
Adaptive Frequency Hopping (AFH) is a method of avoiding fixed frequency interferers. AFH can be used with
Bluetooth voice. All devices in the piconet (Bluetooth network) must be AFH-capable in order for AFH to work.
There is no AFH when connecting and discovering devices. Avoid making Bluetooth connections and discoveries
during critical 802.11b communications. AFH for Bluetooth can be broken-down into four main sections:
•
Channel Classification - A method of detecting an interference on a channel-by-channel basis, or pre-defined
channel mask.
•
Link Management - Coordinates and distributes the AFH information to the rest of the Bluetooth network.
•
Hop Sequence Modification - Avoids the interference by selectively reducing the number of hopping
channels.
•
Channel Maintenance - A method for periodically re-evaluating the channels.
NOTE The VOWT4090 requires the use of a Remote Desktop software to configure settings and software. See
for information on setting up the device with remote desktop software.
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