Powerful communication module for Modbus RTU networks

KUNBUS-COM Interface Module Modbus RTU


  • Dimensions (LxWxH): 85 x 65 x 12 mm
  • Power supply: 3.3 V
  • Low power consumption
  • CDI service interface (config, debug, status)
  • Parameter changes can be made during operation
  • LEDs integrated on the circuit board
  • Fieldbus plug (DSUB 9)
  • Uniform pin-out to the application
  • Freely configurable via Modbus RTU and terminal
  • Galvanic separation (1.5 kV) of application and bus
  • ERNI SMC with 32 pins as plug-in connector to the application


following application interfaces can be selected:

  • Dual port RAM interface
  • SSC shift register interface (SPI)
  • Automatic Baud rate recognition
  • Automatic shift register recognition
  • SDI Modbus interface to the application
  • RS485, RS232, UART
  • Protocolscripter

Environmental Conditions

  • Operating temperature: 0°C to +60°C
  • Storage temperature: -30°C to +85°C
  • Humidity: 0% to 95%, non-condensing
  • Condensing: not allowed
  • Mechanical shock load: 15G
  • Permanent mechanical stress: 5G
Legacy product. No longer available.
Article: Article Number:
KUNBUS-COM Modbus RTU Slave discontinued


KUNBUS-COM Modbus RTU / Serial User Manual
other Modbus RTU modules: Article Number:
KUNBUS-IC Modbus RTU Slave / 3.3 V discontinued
KUNBUS-IC Modbus RTU Slave / 5 V discontinued
Customized Modbus RTU Module --


The communication interfaces in the KUNBUS-COM design were created as a further development of the KUNBUS-IC modules. The version Modbus RTU includes optoelectronic couplers, bus drivers, microcontrollers, and memory, as well as an SMC plug with 32 pins to control or application, and the plug-in connectors for bus connection.

The connection of the COM module is realized either via a cable or simply by plugging onto the control card. Because of the uniform pin-out of all COM modules, they can be replaced easily by other variants (for example CANopen, PROFIBUS, etc.). They then serve as Modbus option cards.