RN Commands Version 4.25, 11/1/2007 Page 3 of 25
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1 Introduction
Scope: This Command Set document along with the RN-21/41 (class 1), RN22/24 (class 2),
and the FireFly™ evaluation board are created to enable developers and integrators an
opportunity to create wireless networks using Bluetooth technology. The goal is to make the
transition to Bluetooth wireless networks as seamless and easy as possible. This document will
explain how to establish Bluetooth communications between Bluetooth enabled devices for
data applications.
Background: The FireFly evaluation board is designed to accommodate the Class1 Bluetooth
radio modem serial modules with 2.4GHz RF ceramic chip antenna or external SMA antenna
Jack. The RN-21, RN-22, and RN-41 modules are Bluetooth ver. 2.0 compliant. The
evaluation board enables a stable platform environment to test serial RS-232 cable
replacement over Bluetooth RF links before going directly to an embedded printed circuit board
design and layout.
Commands: This document describes the protocol used to control and configure RN-XX
Bluetooth Serial Modules. The protocol is similar to the industry standard Hayes AT protocol
used in telephone modems due to the fact that both types of devices are connection oriented.
Appropriate commands have been provided to make the module perform the two core actions
of a Bluetooth device, which is make/break connections and Inquiry. Additional commands are
also provided to perform other functions. The RN-XX serial radio modems can be configured,
commanded, and controlled through simple ASCII strings through the hardware serial UART or
over a remote Bluetooth RF connection .
Applications: The FireFly and RN-24 evaluation boards can be used for both embedded and
PC product applications. The FireFly has RS-232, DB-9 and 0-3.3Vdc direct UART interfaces
to the module. RN-24 has thru hole pins on pin-strip headers, 12 General Purpose 3.3Volt
input/output pins (PIO’s) available for use. Both modules have the ability to control power to the
module, and reset to factory defaults.
Pico-Nets: For applications that require more than point-to-point (2) devices communicating
simultaneously – this is called a pico-net. These applications require one of the Bluetooth
devices to manage all the network connections. The easiest implementation is using a
Personal Computer (PC) that manages this activity with MS Windows Bluetooth stack software
and USB Bluetooth Communicator plugged into the PC (see figure below).
(10 pages)
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