mark125 DDC controller, display, RS485, RS232

DDC controller, display

Supply 10..35 V DC / 24 V AC, Front panel mounting, IP65, dimensions 175 × 105 × 40 mm

RS485, RS232, display Ethernet, web, RS485, RS485, RS232, 4 × 20 LCD display, programming in Merbon IDE. 8 MB RAM, external NVRAM.


DDC (Direct digital control) controllers mark120 and mark125 are free programmable process stations with ARM Cortex M4 processor and OS FreeRTOS. They are suitable for control of small installation or use like control panel for other mark process station with Merbon runtime. Mark 120 contains 1x Ethernet port. Mark125 contains 1x Ethernet port, 1x RS485 interface, 1x RS232 interface and external 8 MB RAM.


  • Control panel for mark process station with Merbon runtime for HVAC systems or other technologies 
  • Free programmable control units for small HVAC systems and other applications