MC-6400 Modbus Controller


The MC-6400 controller is a 64-channel gas monitoring controller that can communicate with up to 64 gas sensors or transmitters through an RS-485 Modbus communication. Four relays can be individually set up to the full scale gas reading and may be latching or non-latching. Used in conjunction with RKI’s transmitters to create a safer working environment.

The MC-6400 controller represents the latest leading edge technology in fixed gas detection today.


64 Channel Wired Modbus Controller
12 to 35V DC Operating voltage with an optional AC power supply
Operating temperature range of -40ºC to +70ºC
Graphical LCD with LED backlight
5 Push-button interface (ADD, MENU, SUB, SCAN/ HOLD and RESET/ESC)
4 Individually configurable alarm set-points: Four front panel ALARM LED indicators (Red); 4 dry- contact relays (4 amps maximum per relay)
Status LEDs for power and fault: multi-color status light; Amber fault LED for indicating system faults
Output options: Wet contact fault terminal, relay 4 can optionally be configured as a fault relay, RS-485 Modbus
NEMA-4X weather, water, and chemical resistant enclosure
1-Year limited hardware warranty


Petrochemical plants
Water & wastewater treatment plants
Pulp & paper mills
Manufacturing facilities
Semiconductor plants
Chemical plants



General Specifications

Product Specifications
Product Type64 Channel wired Modbus gas monitoring controller
Operating Voltage12V to 35V DC (standard)
Power TypeWired power
Power Supply6.25A (150W), 85/264V AC to 24V DC (optional)
Current Draw275 mA maximum (at 24V DC)
Display Screen160 x 104 Resolution graphical LCD screen transflective (sunlight readable) with LED back light
Interface3 Push-buttons (MENU, ADD, SUB, SCAN/HOLD and RESET/ESC)
Product Mounting4 Mounting feet, 6 in. W x 12-1/4 in. T (included) maximum mounting bolt/screw size of 5/16 in. (8mm) diameter
Temperature Range-20°C to +70°C (-4°F to +158°F)
Product CapabilityM2A, T3A, VOC Pro transmitters
Digital InputUp to 64 individual RKI gas detectors using RS-485 Modbus
Relays• 4 Dry-contact relays with 4 amp replaceable fuses • Fault terminal • Optional to disable alarm relay • Latching and non-latching relay settings
Enclosure MaterialsNEMA-4X enclosure, waterproof, chemical, and weather resistant
Wiring HubsSupplied with two 3/4” conduit hubs on bottom of housing. Can be located on sides or top if specified when ordering.
AccessoriesOptional horn and/or strobe on housing (uses 1 or 2 of available relays)
Product Dimensions10 in, L x 8 in. W x 6 in. H (Max. dimensions with attachments)
Total Weight8.5 lbs
Hardware Warranty1-Year Limited

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