MDD-N1 Digital RS-485 output

Device group: Addressable control units
Device type: MDD-N1

MDD-N1 interface units are used to connect a single dual-threshold detector to the Digital Gas Detection System (DGDS). MDD-N1 processes alarm signals of a dual-threshold detector and the relay output fault, and sends them to the supervisory module (MDD-256/T). The MDD-N1 with the connected detector occupies one address in the detectors’ address space (it is treated as a „detector” by the DGDS supervision module).


  • 3 voltage-free inputs (controlled from the external system’s relayoutputs), including 2 configurable to connect external 12VDC alarm outputs;
  • 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;
  • all screwless terminals, removable;
  • input terminals with the possibility of connecting multi-strand wires (no crimping of sleeves) = very simple and quick connection/installation, easy maintenance;
  • tight, mechanically resistant housing;
  • configuration of the module settings via the MDD-256/T supervisory module (manually using the front panel keyboard) or via the dedicated „DETnet View” configuration software, available at

Device model: MDD-N1

Technical parameters

Alarm inputs
Digital RS-485 output
Supply voltage
92 x 82 x 55 mm
EAN Code
Net price
PLN259.00 N


Series Technical data Device information sheet Instruction manual Declaration of conformity