具体协议百度一下，这里只介绍tb相关的点。结合modbus salve（modbus从机模拟）。modbus poll可以读写 modbus salve的数据

    • id
      • 设备编号：对应modbus.json中的unitId
    • function
      • 功能代码: 对应modbus.json中的functionCode
        • 读数据
          • 1 读线圈 [只有开关俩种值] 读写
          • 2 读离散输入 只读
          • 3 读多个保持寄存器 读写
          • 4 读输入寄存器 只读
        • 写数据
          • 5 写单个线圈
          • 6 写单个寄存器
          • 15 写多个线圈
          • 16 写多个寄存器
    • address
      • 地址位：对应modbus.json中的address
    • quantity
      • 数量（从address开始连续读几个）：对应modbus.json中的objectsCount/registerCount

    图1设置modbus从机的四个属性
    图2三个都是设备1
    第一个是功能码3 读地址位0的保持寄存器 写用功能码6或16
    第二个是功能码4 读地址位1和2的输入寄存器 只读
    第三个是功能码1 读地址位3的线圈 只有0/1 开关量 写用功能码5
    image.pngimage.png

    1. {
    2.   "server": {
    3.     "type": "tcp",
    4.     "host": "127.0.0.1",
    5.     "port": 5020,
    6.     "timeout": 35,
    7.     "method": "socket",
    8.     "byteOrder": "BIG",
    9.     "devices": [
    10.       {
    11.         "unitId": 1,
    12.         "deviceName": "Temp Sensor",
    13.         "attributesPollPeriod": 5000,
    14.         "timeseriesPollPeriod": 5000,
    15.         "sendDataOnlyOnChange": true,
    16.         "attributes": [
    17.           {
    18.             "tag": "string_read",
    19.             "type": "string",
    20.             "functionCode": 4,
    21.             "objectsCount": 4,
    22.             "address": 1
    23.           },
    24.           {
    25.             "tag": "bits_read",
    26.             "type": "bits",
    27.             "functionCode": 4,
    28.             "objectsCount": 1,
    29.             "address": 5
    30.           },
    31.           {
    32.             "tag": "8int_read",
    33.             "type": "8int",
    34.             "functionCode": 4,
    35.             "objectsCount": 1,
    36.             "address": 6
    37.           },
    38.           {
    39.             "tag": "16int_read",
    40.             "type": "16int",
    41.             "functionCode": 4,
    42.             "objectsCount": 1,
    43.             "address": 7
    44.           },
    45.           {
    46.             "tag": "32int_read_divider",
    47.             "type": "32int",
    48.             "functionCode": 4,
    49.             "objectsCount": 2,
    50.             "address": 8,
    51.             "divider": 10
    52.           },
    53.           {
    54.             "tag": "8int_read_multiplier",
    55.             "type": "8int",
    56.             "functionCode": 4,
    57.             "objectsCount": 1,
    58.             "address": 10,
    59.             "multiplier": 10
    60.           },
    61.           {
    62.             "tag": "32int_read",
    63.             "type": "32int",
    64.             "functionCode": 4,
    65.             "objectsCount": 2,
    66.             "address": 11
    67.           },
    68.           {
    69.             "tag": "64int_read",
    70.             "type": "64int",
    71.             "functionCode": 4,
    72.             "objectsCount": 4,
    73.             "address": 13
    74.           }
    75.       ],
    76.       "timeseries": [
    77.           {
    78.             "tag": "8uint_read",
    79.             "type": "8uint",
    80.             "functionCode": 4,
    81.             "objectsCount": 1,
    82.             "address": 17
    83.           },
    84.           {
    85.             "tag": "16uint_read",
    86.             "type": "16uint",
    87.             "functionCode": 4,
    88.             "objectsCount": 2,
    89.             "address": 18
    90.           },
    91.           {
    92.             "tag": "32uint_read",
    93.             "type": "32uint",
    94.             "functionCode": 4,
    95.             "objectsCount": 4,
    96.             "address": 20
    97.           },
    98.           {
    99.             "tag": "64uint_read",
    100.             "type": "64uint",
    101.             "functionCode": 4,
    102.             "objectsCount": 1,
    103.             "address": 24
    104.           },
    105.           {
    106.             "tag": "16float_read",
    107.             "type": "16float",
    108.             "functionCode": 4,
    109.             "objectsCount": 1,
    110.             "address": 25
    111.           },
    112.           {
    113.             "tag": "32float_read",
    114.             "type": "32float",
    115.             "functionCode": 4,
    116.             "objectsCount": 2,
    117.             "address": 26
    118.           },
    119.           {
    120.             "tag": "64float_read",
    121.             "type": "64float",
    122.             "functionCode": 4,
    123.             "objectsCount": 4,
    124.             "address": 28
    125.           }
    126.         ],
    127.         "attributeUpdates": [
    128.           {
    129.             "tag": "shared_attribute_write",
    130.             "type": "32int",
    131.             "functionCode": 6,
    132.             "objectsCount": 2,
    133.             "address": 29
    134.           }
    135.         ],
    136.         "rpc": [
    137.           {
    138.             "tag": "setValue",
    139.             "type": "bits",
    140.             "functionCode": 5,
    141.             "objectsCount": 1,
    142.             "address": 31
    143.           },
    144.           {
    145.             "tag": "getValue",
    146.             "type": "bits",
    147.             "functionCode": 1,
    148.             "objectsCount": 1,
    149.             "address": 31
    150.           },
    151.           {
    152.             "tag": "setCPUFanSpeed",
    153.             "type": "32int",
    154.             "functionCode": 16,
    155.             "objectsCount": 2,
    156.             "address": 33
    157.           },
    158.           {
    159.             "tag":"getCPULoad",
    160.             "type": "32int",
    161.             "functionCode": 4,
    162.             "objectsCount": 2,
    163.             "address": 35
    164.           }
    165.         ]
    166.       }
    167.     ]
    168.   }
    169. }

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