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Serial Bluetooth Adapter - RS232

  • Model: UCBT232B


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This product has been replaced by:
S2B2232FIV2: Serial Bluetooth Adapter - RS232 - 2. generation V2.

Bluetooth Serial Adapter modules are often underestimated when it comes to serial RS232 connectivity, fact is that serial communication by a Bluetooth serial adapter actually gives you the most economical, most efficient, secure and reliable wireless serial connection within the 300 feet range.

A Bluetooth serial adapter gives you a convenient and easy way to wirelessly communicate with your serial devices, regardless if they are new or old, and with the Bluetooth 2.0 and 2.1 protocols you get secure 128bit encryption communication.

This Bluetooth serial adapter is a good all-round unit for general wireless RS232 communication with serial printers, building control, scales, office equipment, alarm and security devices, telescopes (tested with ASCOM drivers under Windows with Celestron and Meade telescope mounts and SkySafari on Android), CNC's and other manufacturing machinery. This adapter will also work with most Cisco routers and switches (tested with Cisco Catalyst 3560).
It can be powered by the included USB cable, a USB Mini power adapter, pin 9 at the DB9 connector or by an external battery.

You can communicate with this Bluetooth serial adapter via standard built-in Bluetooth or by using an external USB Bluetooth dongle. The advantage of using one of these methods is that you will need only one Bluetooth serial adapter to setup a communication link.
If you want a direct cable replacement which automatically connects your devices wirelessly without the need for a computer then you can also use this adapter in pairs, (see illustrations below).

For easy configuration of the parameters of this serial Bluetooth adapter we recommend using our USB to serial adapter cable part XS880, unless you have a serial COM port available in your computer.
The parameters can however also be configured over Bluetooth if you have built-in Bluetooth or if you are using a USB Bluetooth dongle.

Each package contains one Bluetooth serial adapter which works as a full duplex transceiver, meaning it can both transmit and receive data. You will need two of these Bluetooth serial adapters to setup a communication link unless you already have a built-in or external Bluetooth dongle. Take a look at our detailed setup examples to see how this adapter can be setup.

Simplified setup examples:
serial bluetooth adapter diagram 4
Serial Bluetooth diagram 3
serial bluetooth adapter example 2
serial bluetooth adapter diagram 1

Overall features
  • Can be powered by: USB, DB9, power supply or battery
  • Highly configurable over serial or wireless interface
    using simple ASCII commands
  • Internal antenna
  • Works with most mobile devices / operating systems
  • USB power cable included
  • DCE/DTE controlled by switch
  • Can be powered through the serial interface
  • LED control lights
  • Works with most serial RS232 devices
  • Full duplex, can send and receive at the same time
  • Many advanced features
  • Works with Cisco routers and switches
  • Male/male gender changer included
Included items
  • Serial Bluetooth adapter
  • USB cable (for power)
  • Wire for connecting battery
  • Datasheet
  • Male/male gender changer


Useful optional accessories
(not included)

usb power supply
USB Bluetooth dongle 200ft

usb power supply
USB Bluetooth dongle 25ft

usb power supply
USB mini 110V/5VDC Power adapter

Battery pack
Rechargeable battery pack

null modem adapter
Null modem adapter
Part number UCBT232B
Operating systems Windows 10, Windows 8, Windows 7, Vista, XP, 2000, ME, 98, Linux, Mac, Android
Interface type RS232
Works with iPad/iPod? No, however it does work with most other Bluetooth enabled smartphones, tablets and devices
Chipset CSR BlueCore4 model BC417
Baud Rates 1200, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
Stop bits 1 or 2
Data bits 7 or 8
Parity None, odd, even
Data buffer size 4Kb
Operating distance 200 to 330 feet (60 to 100 meters) in open space
LED lights TX, RX and Power
Bluetooth stack Serial Port Profile (SPP)
PIN PIN code available for pairing
Connection type Point-to-point
Flow control CTS/RTS
DEC/DTE Manual switch
Parameters configurable by
  • Terminal software such as Tera Term or Putty
  • Over Bluetooth
  • RS232 Signals TX, RX, CTS, RTS, GND
    Echo Configurable by software (on/off)
    NMEA 183 compatible Yes
    Works with Cisco products Yes, routers and switches (tested with Cisco Catalyst 3560)
    Works with Windows 2008/20012 Server? No, Windows Server does not have built-in Bluetooth drivers
    Can pair while serial interface receives data Yes
    Full duplex RS232 Yes, can send and receive simultaneously both when connected over Bluetooth and when used in pairs.
    Number of slaves per master 7
    Parameter configuration Through the serial port or over Bluetooth
    Serial port 1-port female D-Sub 9-pin
    Bluetooth standard V2.0 Class 1, + EDR
    Frequency range 2.4GHz – 2.4835 GHz ISM Band
    Hopping 1.600/sec, 1MHz channel space
    Modulation GFSK-1, DQPSK-2, 8-DPSK-3 Mbps
    Tx power Max. 18dBm (class 1)
    Rx sensivity -86 dBm typical
    Antenna Internal chip
    Antenna gain max 1 to 2 dBi
    Power supply +5 to +6VDC powered by:
    Option 1: USB cable (included)
    Option 2: Pin 9 on DB9 connector
    Option 3: External battery (not included)
    Option 4: Mini USB adapter (not included)
    Current draw Max 90mA
    Operating temp. -13°F to 185°F (-25°C to 85°C)
    Dimensions 87 x 33 x 16 mm
    Total package weight 120g
    Certifications CE, FCC

    For alternative wireless serial solutions please see our full selection of wireless RS232 adapters.

    Read the Review
    Date Added: 01/24/2017 by Edward Magowan
    5 of 5 Stars!5 of 5 Stars!
    I use this for public outreach astronomy to control Celestron CG5-ASGT and CGEM mounts through the h...

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    Date Added: 09/15/2015 by Thorsten Maier
    5 of 5 Stars!5 of 5 Stars!
    Great an reliable, works great with my Telescope-Mount. Excellent Service, quick shipping worldwide....

    Read the Review
    Date Added: 11/02/2014 by Michael Kaplan
    5 of 5 Stars!5 of 5 Stars!
    I have had several of these bluetooth adapters over the years, this one is good and resonable priced...

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    Date Added: 09/01/2013 by Bryan Gallagher
    4 of 5 Stars!4 of 5 Stars!
    For the money this is a great little adapter. Fairly easy to install with good instructions. More ex...

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    Date Added: 11/22/2011 by Ronald Hegewald
    5 of 5 Stars!5 of 5 Stars!
    So far all is good. I wish every device I have bought would work so well. I am using it to send navi...

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    Date Added: 03/14/2011 by Roger Brandon
    4 of 5 Stars!4 of 5 Stars!
    Good product for a resonable price, however since Im using using these in a noisy industrial factory...

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    Date Added: 10/23/2010 by David Johansen
    5 of 5 Stars!5 of 5 Stars!
    extremely useful and reasonable priced adapter. highly recommended

    Read the Review
    Date Added: 04/16/2010 by Mark Jensen
    5 of 5 Stars!5 of 5 Stars!
    Good product, works fine for me, even with Windows Vista

    Read the Review
    Date Added: 02/26/2010 by Jack Brown
    4 of 5 Stars!4 of 5 Stars!
    Being unable to pull cables between a PC and a CNC operated machine we found this wireless adapter t...

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    Date Added: 01/22/2010 by Paul Calden
    4 of 5 Stars!4 of 5 Stars!
    Great litte adapter! very convenient and usable in a varity of applications.

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