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Serial Bluetooth Adapter - RS232 - 2. generation V2

  • Model: S2B2232FIV2
  • In Stock


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This is our new 2nd generation version 2 serial to Bluetooth adapter. It is replacing the older UCBT232B and S2B2232I adapters. This new version has a new processor for better stability and performance, Bluetooth version 2.1, more functions and is more user friendly. This version has several improvements:

Parameters can be configured over BLE Bluetooth using an iOS/Android app.

One of the most noticeable improvements is that this 2nd generation version 2 adapter's parameters can now be configured over BLE Bluetooth using an app on any iOS or Android phone or tablet. The app will connect to the adapter via BLE Bluetooth and the user can then easily select which parameter to configure.
Alternatively the adapter can be configured using AT commands using a standard terminal program such as Putty or Tera Term. However this rather old fashioned way of configuration is not very user friendly, especially because it requires a USB to serial adapter to be able to connect the adapter to a PC for the user to be able to search for the right AT command to set the correct parameter.

Supports more data bits and stop bits

While older serial Bluetooth adapter usually only supports 6 and 7 data bits and 1 or 2 stop bits, this new version 2 adapter supports 5,6,7 data bits and 1, 1.5 and 2 stop bits, meaning it will be compatible with even more types of serial devices.

Easier pairing with slave adapters

This new version 2 serial Bluetooth adapter has two new functions: the 'one' command and the 'auto' command. With the 'One' command the master adapter will automatically pair with only one slave adapter, even there are multiple adapters within the same range.
The 'auto' command will allow the master adapter to automatically pair with multiple slave adapters with the same pin code.

A Versatile Wireless Solution

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 serial devices with each other as a direct 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.
It will work with most devices which has a standard serial RS232 port such as serial printers, building control, scales, office equipment, alarm and security devices, telescopes (tested with ASCOM drivers under Windows with Celestron and Meade telescopes), CNC's, most manufacturing machinery and many many more types of serial devices. 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 Android app
  • 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 S2B2232FIV2 (internal chip antenna)
S2B2232FEV2 (external di-pole antenna)
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 ESP32-D0WDQ6-V3 with External 4M flash
Baud Rates 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400 bps
Stop bits 5, 6, 7, 8
Data bits 1, 1.5, 2
Parity None, odd, even
Data buffer size RX buffer: 2048 bytes
TX buffer: 8192 bytes
Queue buffer size: 30 bytes
Operating distance 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
  • Over serial port (with AT commands/terminal software)
  • Over BLE Bluetooth using an Android app (currently only firmware version lower than V7.18)
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 (for serial port communication)
BLE V4.2 (for parameter configuration)
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 S2B2232FIV2: Internal dipole
S2B2232FEV2: External 2dBi di-pole, Reverse Polarity SMA male (inside threads / center receptacle)
Antenna connector on adapter (S2B2232FEV2) Reverse Polarity SMA female (outside threads / center pin)
Power supply
  • Mini USB cable (5VDC)
  • DB9 connector Pin 9 (5 - 40VDC)
  • Screw terminals (5 - 40VDC)
Current draw Max 100mA
Operating temp. -13°F to 185°F (-25°C to 85°C)
Dimensions 89 x 39 x 17.5 mm
Adapter weight 34g
Certifications CE, FCC, RoHS

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


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