Start   Products   Order   Contact   Imprint   search   terms

RS232 I2C Adapter (Master)                                            

The RS232 I2C Adapter is an universal applicable I2C-tool with a 128 bytes of buffer and a SCL-frequency up to 400 kHz. With the RS232 I2C Adapter as master numerous bus participants can be adressed such as IOExpander, sensors, LCDs, 7-segment display, stepping motors, AD/DA converters, real time clocks, tone generators, RAM, EEProms, etc.


The Tool is ideally for the developer, who would like to develop and/or test own I2C circuits. The SCL frequency can be adjusted between 15 - 400 kHz. The frequency depends on the Adapter’s type.

Following are the different types we offer:

  • 200kHz: SCL-frequency adjustable between 8 and 200kHz. Needs external power supply of 5V.

  • 400kHz: SCL-frequency adjustable between 12 and 400kHz. Needs external power supply of 5V.

  • LowPower: SCL-frequency adjustable between 1 and 100kHz. No separate power packs for voltage supply are needed. Power supply is provided from the RS232- Interface (DTR & RTS). 
    Power consumption less than 5mA.


The adapter (only 200 & 400 types) contains an I2C level shifter on board. Thus, it is possible to connect the adapter to an I2C bus having different voltage levels between 2V and 15V.


Labview VIs and a 32bit DLL (for Windows) are included in delivery. This makes the integration of the adapter into own applications possible.


It is possible to communicate with the adapter using Windows API functions such as CreateFile(), WriteFile() and ReadFile(). A simple software interface (ASCII commands) is available.


Some of the software Tools are for the developer very helpfully. Thus it is possible to test immediately I2C devices. The software "IIC Control" supports EEPROMS of 1kbit (128 bytes) to 1Mbit (128k byte).





  • RS232 Sub-D

  • Configurable I2C frequency 8Hz - 400kHz

  • adjustable duty cycle (SCL-frequency)

  • On board I2C level shifter, I2C levels from 2V to 15V

  • supports multi-master

  • Master transmit & receive

  • supports clock streching

  • 7bit addressing

  • Interrupt input for external events

  • Simple software interface / ASCII commands

  • 32Bit DLL for Windows

  • Labview VIs

 RS232 I2C Adapter 200 & 400 kHz (Master)


RS232 I2C Adapter 200

59,- EUR plus VAT & shipping.



RS232 I2C Adapter 400 85,- EUR plus VAT & shipping.



RS232 I2C Adapter LP

(Low Power)

85,- EUR plus VAT & shipping.


included in delivery:

RS232 I2C Adapter


IIC Device Control


32bit DLL for Windows


Examples for Delphi, VB, VC++ (MFC) and Labview





Software, Manuals, DLL, Components and Examples


IICControl Software

 RS232 I2C Adapter LowPower  (Master)

RS232 I2C Adapter (200/400 kHz)

RS232 I2C Adapter LowPower