MDD-S2 Digital RS-485 output

Device group: Addressable control units
Device type: MDD-S2

MDD-S2 addressable alarm output units are used to control optical and acoustic alarm devices in the Digital Gas Detection System (DGDS). It is possible to control alarm devices with a nominal voltage of 12VDC e.g. SL-32, SL-21, S-3x, LD-2.

MDD-S2 can be mounted anywhere on the RS-485 bus (outside the explosion hazard zone) and have two 12VDC alarm outputs.


  • two 12VDC alarm outputs with the possibility of connecting optical and acoustic alarm devices;
  • RS-485 port, MODBUS RTU protocol, galvanically isolated;
  • „non-contact” testing (magnetically, without opening the case);
  • 24VDC power supply from the bus with a single FTP cable;
  • can be added anywhere on the bus;
  • RS-485 bus terminator can be set;
  • all terminals are screwless, removable;
  • signalling terminals with the possibility of connecting multistrand wires (no crimping of sleeves) guarantees a very simple and quick connection/installation and easy maintenance;
  • mechanically resistant housing;
  • configuration of the module settings via the MDD-256/T supervisor module (manually using the front panel keyboard) or via the dedicated „MDD256 View” configuration software, available at

Device model: MDD-S2

Technical parameters

Alarm control outputs 12VDC
Digital RS-485 output
Supply voltage
93 x 87 x 55 mm
EAN Code
Net price
PLN259.00 N


Series Technical data Device information sheet Instruction manual Declaration of conformity