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Serial Bluetooth Adapter - RS232 - 2. generation

  • Model: S2B2232I


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This is our new 2. generation serial to Bluetooth adapter. It is replacing the older UCBT232B adapter. This new version has an updated processor for better stability and performance, Bluetooth version 2.1, more functions and is more user friendly.
One major improvement is that the most common parameters such as baud rate, parity, stop bit, master/slave mode and flow control can be easily set by DIP switches on the back of the adapter. No need to connect the adapter to a PC and configure these parameters by AT commands.

Using a serial to Bluetooth adapter is a fast, easy and reliable way of connecting a serial device to a PC, or to link two piceses of serial equipment with each other by using two serial Bluetooth adapters linked together as a wireless cable replacement.
The communication range is up to 300 feet line of sight when using Class 1 Bluetooth devices, and since Bluetooth inherently has secure 128bit encryption you get a very good and secure communication link.

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).

You can communicate with this serial Bluetooth adapter using a PC with 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 serial Bluetooth adapter to setup a communication link with a PC.
If you need a direct cable replacement which automatically links two serial devices together without using a PC then you can use two adapters linked together as a pair.

The adapter can be powered by the included USB cable, through screw terminals or through the DB9 connector.

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
  • Easy parameter configuration by DIP switches
  • Internal antenna
  • Bluetooth version 2.1
  • Power options: USB, screw terminals or DB9
  • Works with most mobile devices / operating systems
  • DCE/DTE controlled by switch
  • LED indication 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
Included items
  • Serial Bluetooth adapter
  • USB cable (for power)
  • Datasheet


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

null modem adapter
Null modem adapter
Part number S2B2232I
Operating systems Windows 11, 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 Class 1 Bluetooth: up to 330 feet (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
  • DIP switches
  • 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, limited
    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
    Serial port 1-port female D-Sub 9-pin
    Bluetooth standard V2.1 Class 1 (up to 300 feet)
    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
    • Mini USB cable (5VDC)
    • DB9 connector Pin 9 (5.0VDC, 1.0A)
    • Screw terminal connector (5.0 – 40VDC)
    Current draw Max 100mA
    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.


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