{
  "$schema": "https://raw.githubusercontent.com/nobrega8/mbmap-library/main/schema/mbmap-2.schema.json",
  "mbmap": 2,
  "vendor": "Kohler",
  "model": "Decision-Maker 550",
  "models": ["Decision-Maker 550"],
  "vendor_website": "rehlko.com",
  "revision": 3,
  "revised": "2026-11-10",
  "source": "Kohler, \"Protocol Operation: Modbus Communications Protocol\", TP-6113 12/21; https://techcomm.kohler.com/techcomm/pdf/tp6113.pdf",
  "notes": [
    "Decision-Maker 550 generator set controller.",
    "Addresses are zero-based: the manual register 40001 is address 0.",
    "The manual limits a read to 50 registers. Only the monitoring part of the register table is in this map.",
    "Data is available over Modbus RTU (8N1); Modbus TCP needs a Modbus/Ethernet converter.",
    "For controllers with application code 2.10 or higher; older code versions use a different register map."
  ],
  "parity": "N",
  "databits": 8,
  "stopbits": 1,
  "max_read_registers": 50,
  "byte_order": "big",
  "word_order": "little",
  "address_base": 0,
  "x_status": "official",
  "sources": [
    {"title": "Protocol Operation: Modbus Communications Protocol (TP-6113)", "version": "12/21", "date": "2021-12", "url": "https://techcomm.kohler.com/techcomm/pdf/tp6113.pdf", "note": "section 4 (application code 2.10 or higher); register tables also compared with edition 9/14"}
  ],
  "registers": [
    {"name": "L1-L2 Voltage", "area": "holding", "address": 0, "type": "uint16", "unit": "V", "access": "R"},
    {"name": "L2-L3 Voltage", "area": "holding", "address": 1, "type": "uint16", "unit": "V", "access": "R"},
    {"name": "L3-L1 Voltage", "area": "holding", "address": 2, "type": "uint16", "unit": "V", "access": "R"},
    {"name": "L1-L0 Voltage", "area": "holding", "address": 3, "type": "uint16", "unit": "V", "access": "R"},
    {"name": "L2-L0 Voltage", "area": "holding", "address": 4, "type": "uint16", "unit": "V", "access": "R"},
    {"name": "L3-L0 Voltage", "area": "holding", "address": 5, "type": "uint16", "unit": "V", "access": "R"},
    {"name": "L1 Current", "area": "holding", "address": 6, "type": "uint16", "unit": "A", "access": "R"},
    {"name": "L2 Current", "area": "holding", "address": 7, "type": "uint16", "unit": "A", "access": "R"},
    {"name": "L3 Current", "area": "holding", "address": 8, "type": "uint16", "unit": "A", "access": "R"},
    {"name": "Frequency", "area": "holding", "address": 9, "type": "uint16", "scale": 0.01, "unit": "Hz", "access": "R"},
    {"name": "Total kW", "area": "holding", "address": 10, "type": "uint16", "unit": "kW", "access": "R"},
    {"name": "Percent of Rated kW", "area": "holding", "address": 11, "type": "uint16", "unit": "%", "access": "R"},
    {"name": "Total Power Factor", "area": "holding", "address": 12, "type": "int16", "scale": 0.01, "access": "R"},
    {"name": "L1 kW", "area": "holding", "address": 13, "type": "uint16", "unit": "kW", "access": "R"},
    {"name": "L1 Power Factor", "area": "holding", "address": 14, "type": "int16", "scale": 0.01, "access": "R"},
    {"name": "L2 kW", "area": "holding", "address": 15, "type": "uint16", "unit": "kW", "access": "R"},
    {"name": "L2 Power Factor", "area": "holding", "address": 16, "type": "int16", "scale": 0.01, "access": "R"},
    {"name": "L3 kW", "area": "holding", "address": 17, "type": "uint16", "unit": "kW", "access": "R"},
    {"name": "L3 Power Factor", "area": "holding", "address": 18, "type": "int16", "scale": 0.01, "access": "R"},
    {"name": "Total kVAR", "area": "holding", "address": 19, "type": "int16", "unit": "kvar", "access": "R"},
    {"name": "L1 kVAR", "area": "holding", "address": 20, "type": "int16", "unit": "kvar", "access": "R"},
    {"name": "L2 kVAR", "area": "holding", "address": 21, "type": "int16", "unit": "kvar", "access": "R"},
    {"name": "L3 kVAR", "area": "holding", "address": 22, "type": "int16", "unit": "kvar", "access": "R"},
    {"name": "Total kVA", "area": "holding", "address": 23, "type": "uint16", "unit": "kVA", "access": "R"},
    {"name": "L1 kVA", "area": "holding", "address": 24, "type": "uint16", "unit": "kVA", "access": "R"},
    {"name": "L2 kVA", "area": "holding", "address": 25, "type": "uint16", "unit": "kVA", "access": "R"},
    {"name": "L3 kVA", "area": "holding", "address": 26, "type": "uint16", "unit": "kVA", "access": "R"},
    {"name": "Current Lead/Lag", "area": "holding", "address": 27, "type": "uint16", "access": "R"},
    {"name": "Oil Pressure", "area": "holding", "address": 32, "type": "uint16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Coolant Temperature", "area": "holding", "address": 33, "type": "int16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Engine Speed", "area": "holding", "address": 34, "type": "uint16", "unit": "rpm", "access": "R"},
    {"name": "Local Battery Voltage", "area": "holding", "address": 35, "type": "uint16", "scale": 0.1, "unit": "V", "access": "R"},
    {"name": "Fuel Pressure", "area": "holding", "address": 36, "type": "uint16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Fuel Temperature", "area": "holding", "address": 37, "type": "int16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Fuel Rate", "area": "holding", "address": 38, "type": "uint16", "scale": 0.01, "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Used Last Run", "area": "holding", "address": 39, "type": "uint16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Coolant Pressure", "area": "holding", "address": 40, "type": "uint16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Coolant Level", "area": "holding", "address": 41, "type": "uint16", "scale": 0.1, "unit": "%", "access": "R"},
    {"name": "Lube Oil Temperature", "area": "holding", "address": 42, "type": "int16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Oil Level", "area": "holding", "address": 43, "type": "uint16", "scale": 0.1, "unit": "%", "access": "R"},
    {"name": "Crankcase Pressure", "area": "holding", "address": 44, "type": "uint16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Ambient Temperature", "area": "holding", "address": 45, "type": "int16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "ECM Battery Voltage", "area": "holding", "address": 46, "type": "uint16", "scale": 0.1, "unit": "V", "access": "R"},
    {"name": "ECM Status", "area": "holding", "address": 47, "type": "uint16", "access": "R"},
    {"name": "Intake Air Temperature", "area": "holding", "address": 48, "type": "int16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "Intake Air Pressure", "area": "holding", "address": 49, "type": "uint16", "access": "R", "description": "Unit follows the controller display setting (metric or English)"},
    {"name": "MDEC/ADEC Fault Codes", "area": "holding", "address": 50, "type": "uint16", "access": "R"},
    {"name": "Analog Input 00 (Battery Voltage)", "area": "holding", "address": 60, "type": "uint16", "unit": "V", "access": "R"},
    {"name": "Analog Input 01", "area": "holding", "address": 61, "type": "uint16", "access": "R"},
    {"name": "Analog Input 02", "area": "holding", "address": 62, "type": "uint16", "access": "R"},
    {"name": "Analog Input 03", "area": "holding", "address": 63, "type": "uint16", "access": "R"},
    {"name": "Device ID", "area": "holding", "address": 49998, "type": "uint16", "access": "R", "reference": "0x0014", "description": "Fixed controller type code"}
  ]
}