{
  "$schema": "https://raw.githubusercontent.com/nobrega8/mbmap-library/main/schema/mbmap-2.schema.json",
  "mbmap": 2,
  "vendor": "AEPH do Brasil",
  "model": "ONIX",
  "models": ["ONIX"],
  "vendor_website": "aephdobrasil.com.br",
  "description": "Weighing indicator: displayed weight with status (gross or net, stable, negative, overload), tare and remote tare, zero and print commands",
  "revision": 1,
  "revised": "2026-11-08",
  "source": "AEPH do Brasil ONIX manual, chapter 20 (Modbus RTU protocol)",
  "sources": [
    {"title": "Manual ONIX", "version": "2.0", "date": "2018-07-10", "url": "https://www.aephdobrasil.com.br/storage/files/2024/12/onix-1733257302.pdf", "note": "chapter 20; linked in issue #148"}
  ],
  "notes": [
    "Modbus RTU (slave); set PR = rtU on the indicator. FC03 reads and FC06 writes holding registers. Addresses are 0-based, as sent on the wire.",
    "The manual asks for 19200 bit/s, 8 data bits, no parity, 2 stop bits. The address (END) is 1 to 99.",
    "Weight and tare are 17-bit values split over two registers: the high byte of the first register holds the status (or the decimal places), its lowest bit is bit 16 of the value, and the second register holds bits 0-15. They are given here as separate registers because the format has no type for this layout.",
    "The manual's register list gives the weight and tare registers as 0x0010 and 0x0012, but its example frames read them at 10 (0x000A) and 12 (0x000C); this map follows the frames.",
    "The command values follow the manual's example frames (1 = tare, 2 = zero, 3 = clear tare, 4 = print); the text next to the frames disagrees in places.",
    "Written from the manual; this map has not been tested on a device."
  ],
  "protocol": "rtu",
  "unit_id": 1,
  "baudrate": 19200,
  "parity": "N",
  "databits": 8,
  "stopbits": 2,
  "byte_order": "big",
  "word_order": "big",
  "address_base": 0,
  "x_status": "official",
  "enums": {
    "decimal_point": {"0": "No decimals", "1": "0.0", "2": "0.00", "3": "0.000", "4": "0.0000"}
  },
  "registers": [
    {"name": "Weight", "group": "Weight", "area": "holding", "address": 11, "type": "uint16", "description": "Bits 0-15 of the displayed weight; bit 16 is in register 10. Weight = bit 16 x 65536 + this value, with the decimal point and sign given by the status"},
    {"name": "Weight bit 16", "group": "Weight", "area": "holding", "address": 10, "type": "bool", "bit": 0},
    {"name": "Weight decimal point", "group": "Weight", "area": "holding", "address": 10, "type": "uint16", "bit": 8, "bits": 3, "enum": "decimal_point"},
    {"name": "Negative weight", "group": "Weight", "area": "holding", "address": 10, "type": "bool", "bit": 11},
    {"name": "Stable weight", "group": "Weight", "area": "holding", "address": 10, "type": "bool", "bit": 12},
    {"name": "A/D saturation", "group": "Weight", "area": "holding", "address": 10, "type": "bool", "bit": 13},
    {"name": "Overload", "group": "Weight", "area": "holding", "address": 10, "type": "bool", "bit": 14},
    {"name": "Gross weight", "group": "Weight", "area": "holding", "address": 10, "type": "bool", "bit": 15, "enum": {"0": "Net", "1": "Gross"}},

    {"name": "Tare", "group": "Tare", "area": "holding", "address": 13, "type": "uint16", "description": "Bits 0-15 of the tare; bit 16 is in register 12"},
    {"name": "Tare bit 16", "group": "Tare", "area": "holding", "address": 12, "type": "bool", "bit": 0},
    {"name": "Tare decimal point", "group": "Tare", "area": "holding", "address": 12, "type": "uint16", "bit": 8, "bits": 3, "enum": "decimal_point"},

    {"name": "Remote command", "group": "Commands", "area": "holding", "address": 2, "type": "uint16", "access": "W", "enum": {"1": "Tare", "2": "Zero", "3": "Clear tare", "4": "Print"}}
  ]
}