W&T connects
Interfaces for TCP/IP, Ethernet, RS-232, RS-485, USB, 20mA, glass and plastic fiber optic cable, http, SNMP, OPC, Modbus TCP, I/O digital, I/O analog, ISA, PCI
Data sheet:

RS232 Universal Serial Buffer

4 MB for storing and reading out serial data

The RS232 Universal Serial Buffer can be used to buffer store serial data and includes a flash memory with a capacity of 4MB. The various operating modes provide great versatility.


Management and Connectivity:

  • Non-volatile buffering of serial data:
    • Print and plot data
    • Telephone fee information
    • machine data
    • etc...
  • Data back channel allows connection of bi-directional peripheral devices
  • Both ports can be configured independently of each other
  • Conversion of baud rate, data format and handshake protocol possible:
  • Addition of RS422, RS485 or 20mA interface modules available on request
  • Integrated diagnostic and startup aid: Setting dump
  • Extended supply voltage range up to 24V

Standards & more

  • Conforms to standards both in office and industrial environments:
    • High noise resistance per EN 61000-6-2
    • Low noise emission per EN 55032:2015 + A1 Cl. B, EN 61000-3-2 & EN 61000-3-3
  • 5 year guarantee

Application Examples

Application example "Buffer storing fee and call data":
Telephone systems provide fee data with each conversation, which are output directly on the RS232 port of the telephone equipment. Processing this data used to require that a PC with a running receiving program be continuously connected and turned on in order to be able to receive this fee data. The telephone equipments itself generally does not have sufficient buffer storage capacity.

The serial buffer takes the call data until it is queried by the PC. The PC may in the meantime be turned off or used for other purposes. The buffer stores the data in a non-volatile memory, so that power failures do not result in loss of the valuable data. To query the buffer from the PC, use either our small software tool, which generates text or Excel files, or integrate the 3-byte query sequences directly into your fee calculation software.

Converting serial transmission parameters (e.g. baud rate converter):
If you need to connect two terminal devices in serial whose interfaces have different, non-configurable transmission parameters (baud rate, data format and handshake procedure), the RS232 Universal Serial Buffer can be used as a converter.

Since the transmission parameters for the two buffer interfaces can be set independently of each other, it is possible to connect both terminal devices together through the buffer. When the buffer receives data at a port, the format is converted to that of the second device and passed to that device. Upward converting of the transmission speed (baud rate) is also possible using the internal 4 MB memory. The set handshake procedure controls the data flow and prevents the memory from overflowing.

As part of the conversion of the serial transmission parameters baud rate, data format and handshake procedure can be changed.

Technical data

Connections and displays:

  • Serial ports:
    • 2x RS232 (both ports can be configured
    • independently of each other)
  • Input:
    • 9-pin SUB-D socket with DCE assignment
  • Output:
    • 9-pin SUB-D male with DTE assignment
  • Supported signals:
    • RxD, TxD, CTS, DTR
  • Baud rate:
    • 150 to 115.200 kBaud
  • Data format:
    • 7,8 data bits, no,even,odd parity
  • Flow control:
    • Hardware handshake or
    • XON/XOFF protocol
  • Integrated buffer:
    • 4MB flash memory
  • Operating modes:
    • Standard print/plot buffer
    • Fee data buffer
  • Power supply:
    • 12..24V DC/AC
  • Current consumption:
    • typ. 30mA at 24V DC

Housing and other data:

  • Housing:
    • Plastic housing, 105 x 75 x 45mm
  • Weight:
    • approx. 150g
  • Ambient temperature:
    • Storage: -40 .. +70°C, Operation: 0 .. +60°C
  • Permissible relative humidity:
    • 0..95% RH (non-condensing)
  • Scope of delivery:
    • 1x RS232 Universal Serial Buffer, 4MB
    • Please order power supplies separately as accessories


*Net unit price for
commercial users
  • Power supplies

    • Plug-in power supply, 24V / 500mA DC with Euro plug
    • 11021
    • 21.00€
    • Plug-in Power Supply, 24V / 750mA DC with Euro, US and UK plug
    • 11026
    • 38.00€
    • Power supply for DIN rail, 24V / 630mA DC
      (merchandise, 2-year manufacturer’s guarantee)
    • 11080
    • 33.00€
  • Cable and Connector Accessories

    • RS232 1:1-Cable, DB9F - DB9M, 2m
    • 11952
    • 9.90€
    • RS232 PC/PC cable, DB9F x DB9F, 1.8m
    • 11992
    • 9.90€
  • Mechanical Accessories

    • Mounting bracket for wall mounting
    • 58812
    • 11.20€
    • 19" DIN rail
    • 58813
    • 21.00€

* Our offering is intended only for commercial users. We will be happy to refer private end customers to trading partners through whom our products can be purchased.