FireFly
User Manual
www.rovingnetworks.com
RN-240-um Version 1.0 2/22/2010
809 University Avenue
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Los Gatos, CA 95032
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Tel (408) 395-6539
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Overview
The FireFly serial adapter is compact, versatile Class 1 Bluetooth serial adapter. It enables wireless connections
to any legacy serial port and supports bi-directional RS232 or RS422 signaling at a rate of up to 464Kbps. Just
attach the FireFly to your device's RS232/EIA232/422 port, connect over Bluetooth, and you have a wireless cable
replacement solution. The transmit range can be up to 330' (100M), depending upon environmental factors.
FireFly Bluetooth adapter can be used as a Bluetooth Master or Slave device. The SPP connection to the unit
appears via a virtual COM interface. Data is sent and received on the client exactly as if a serial cable was
connected to a real COM port on the client.
FireFly can also be used in cable replacement mode where two Roving Networks Bluetooth devices are paired
using the configuration switches. The USB to Bluetooth (RN-USB-X) has pairing switches and can be used with
the FireFly BP to create a wireless connection to a PC without using the PC’s Bluetooth stack. For more
information on cable replacement, please refer to our “Cable Replacement Application Note” on the website.
Status LEDs
The GREEN LED shows the Bluetooth connection status and the adapter operational mode. Upon boot up, it blinks
two times per second. In configuration mode, it blinks at a fat rate of ten times per second. When the module is in
discoverable or idle mode, the GREEN LED blinks one time per second. When the module is in connected sate, the
GREEN LED is solid ON.
MODE
GREEN LED BLINK
In Configuration mode
Fast, 10 x per second
Boot up, Remote Configurable 2 times per second
Discoverable/Idle
1 time per second
Connected
On Solid
The yellow LED blinks when data is sent or received on the serial interface. This does not indicate that the data
was sent over the Bluetooth connection. If the yellow LED is not flashing when your device is sending data to the
serial port, you likely have the connection or flow control incorrectly set.
Some versions of RN-240 have a RED LED. This LED blinks when there is data being received over the RF link.
