node-red：modbus协议数据格式转换

??本文将描述通过node-red采集工业数据时，采集到的数据需要进行转换的操作方法。
??对于运行在RTU或ASCII传输模式下的modbus协议，它接收主设备发送的指令报文，并根据窗口配置的数据返回主设备需要的指令报文。根据Modbus协议的规定，所有的数值都是以16位二进制形式进行存储和运算的。

回到目录

一、32word无符号转换

??Modbus协议中，32位整数的存储格式会因具体的数据类型而有所不同。Modbus协议对32位无符号整数的存储方式是将该整数分解为两个16位的寄存器来处理，第一个元素是高16位，第二个元素是低16位，具体的字节顺序可以有四种选择：无符号整数大端序、无符号整数小端序、无符号整数大端字节交换和无符号整数小端字节交换。例如，一个无符号的32位整数0x12345678在Modbus中的存储形式可能会是：0x12 0x34 0x56 0x78，具体取决于所选择的字节顺序。其中：

• 大端序Big-Endian（BE）：将最高位字节存储在最低的地址位置；
• 小端序（LE）：则是将最高位字节存储在最高的地址位置；
• 无符号整数大端字节交换和小端字节交换（BIG_ENDIAN和LITTLE_ENDIAN）：指将每个字节的顺序颠倒，但不考虑符号位。

1.1 写操作

1. 将32位整数转换为16位整数数组

• 使用无符号整数大端序（BE）的转换方式，js代码如下：

/** 使用无符号整数大端序（BE）的转换方式，将一个32位整数，转换为一个包含两个元素的数组，
 * 其中第一个元素是高16位，第二个元素是低16位 */
function int32ToArrayBE(num) {
    const high = (num >> 16) & 0xFFFF;
    const low = num & 0xFFFF;
    return [high, low];
}

2. 通过modbus节点写入，示例如下
   
   数据已成功写入：
   

回到目录

1.2 读操作

实现步骤：

1. 将一个包含两个元素的数组转换为一个32位整数

• 使用无符号整数大端序（BE）的转换方式，js代码如下：

//将一个包含两个元素的数组转换为一个32位整数，其中第一个元素是高16位，第二个元素是低16位。
//转换方式是先将第一个元素左移16位，然后与第二个元素进行按位或操作。
function arrayToInt32BE(data) {
    return (data[0] << 16) | data[1];
}

2. 通过modbus节点读取，示例如下：
   

回到目录

二、字符串转换

??modbus支持对字符串类型的数据进行读写操作，进行字符串类型数据的操作时，是基于ASCII码格式进行的，一个字符占一个字节，支持字母、中文已经符号。

2.1 字符串写操作

实现步骤：

1. 将字符串转换成字节数组，函数如下：

/**将一个字符串，获取每个字符的Unicode编码，转换为字节数组 */
function stringToByteArray(str) {
    let byteArray = [];
    for (let i = 0; i < str.length; i++) {
        byteArray.push(str.charCodeAt(i));
    }
    return byteArray;
}

2. 将字节数组批量写入modbus中 ，示例如下：
   
   执行后，可以看到对应地址的数据：
   

回到目录

2.2 字符串读操作

实现步骤：

1. modbus节点读取起始地址为n，直至字符串字节数组长度的连续地址的数据数组
2. 将得到到的字节数组转换为字符串，转换函数如下：

//将Unicode编码字节数组转换为对应的字符
msg.payload = String.fromCharCode(...msg.payload.slice(0, 8));
//有需要的话可以去掉字符串中的null和结尾的空字符
msg.payload = msg.payload.trim().replace(/\u0000/g, '');
return msg;

示例如下：

回到目录

三、有符号整数转换

1. 正整数就是正常的读\写，不需要转换。
2. 对于负数，在计算机和数字系统中，负数通常使用二进制补码形式来表示。这种方法是将负数的绝对值取反后再加一得到的。如’-80’的二进制补码就是’65456’。

如我们在modsim32中输入-55，实际显示在计算机上的是65481

3.1 有符号16word转换

3.1.1 负数 读 操作

??有符号16word转换成补码是占一位地址，通过modbus读取过来是十进制整数，我们需要将其通过node-red的modbus协议读取对应地址下的数据，该数据为补码，需要将其转换为实际的有符号16位整数。有两种转换方式，如下示例所示：

1. 通过js函数转换：

/** 有符号整数补码转换转成16位有符号整数：
 * 如-80的补码为65456，读取出来是65456，需要通过该函数转换成-80
 */
function Signed16ToInt16Be(num){
    //32767是16位带符号证书能表示的最大正数，当数值从32767再增加1时，就会上溢变成负数。
    //即mod通信中所有的负数都是用补码形式存储（如‘-80’实际读\写出来是‘65456’）
    //需要检测是否发生了从正数到负数的转换，即是否发生了上溢或下溢,如果有，进行转换
    return num >= 32768 ? num - 65536 : num;
}

2. 使用parse节点工具转换：
   

回到目录

3.1.2 负数 写 操作

?? 直接将负数写入对应地址时，不生效。需要先将其转换成补码，然后再将补码写入地址。js将负数转换成补码的函数如下：

/** 
 * 负数转成对应的补码
 * 在计算机中，负数通常使用补码表示，如'-80'用补码表示为'65456'.
 */
function Int16BeToSigned16(num) {
    //如果数字小于0，将其转换成十进制补码：65536是2的16次幂，也就是2^16
    if(num < 0){
        num += 65536
    }
    return num;
}

实战示例如下：

回到目录

3.2 有符号32word转换

回到目录

源码

[
    {
        "id": "1e64108c77baa639",
        "type": "inject",
        "z": "f77425d62009612d",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 130,
        "y": 580,
        "wires": [
            [
                "7dc4362a647fb9f4"
            ]
        ]
    },
    {
        "id": "7dc4362a647fb9f4",
        "type": "modbus-getter",
        "z": "f77425d62009612d",
        "name": "",
        "showStatusActivities": false,
        "showErrors": false,
        "showWarnings": true,
        "logIOActivities": false,
        "unitid": "2",
        "dataType": "HoldingRegister",
        "adr": "99",
        "quantity": "1",
        "server": "e7cbfcc879655084",
        "useIOFile": false,
        "ioFile": "",
        "useIOForPayload": false,
        "emptyMsgOnFail": false,
        "keepMsgProperties": false,
        "delayOnStart": false,
        "startDelayTime": "",
        "x": 300,
        "y": 580,
        "wires": [
            [
                "b156bb1bacfff01f",
                "1b8c974bcad376f7",
                "4ec96886cf6ddcfc"
            ],
            []
        ]
    },
    {
        "id": "b156bb1bacfff01f",
        "type": "buffer-parser",
        "z": "f77425d62009612d",
        "name": "",
        "data": "payload",
        "dataType": "msg",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "type": "int16be",
                "name": "item1",
                "offset": 0,
                "length": 1,
                "offsetbit": 0,
                "scale": "1",
                "mask": ""
            }
        ],
        "swap1": "",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "resultType": "keyvalue",
        "resultTypeType": "return",
        "multipleResult": false,
        "fanOutMultipleResult": false,
        "setTopic": true,
        "outputs": 1,
        "x": 470,
        "y": 580,
        "wires": [
            [
                "38805fdde3a44395"
            ]
        ]
    },
    {
        "id": "38805fdde3a44395",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "parse转换",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 620,
        "y": 580,
        "wires": []
    },
    {
        "id": "1b8c974bcad376f7",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "函数转换",
        "func": "msg.payload = Signed16ToInt16Be(msg.payload);\nreturn msg;\n/** 有符号整数补码转换转成16位有符号整数：\n * 如-80的补码为65456，读取出来是65456，需要通过该函数转换成-80\n */\nfunction Signed16ToInt16Be(num){\n    //32767是16位带符号证书能表示的最大正数，当数值从32767再增加1时，就会上溢变成负数。\n    //即mod通信中所有的负数都是用补码形式存储（如‘-80’实际读\\写出来是‘65456’）\n    //需要检测是否发生了从正数到负数的转换，即是否发生了上溢或下溢,如果有，进行转换\n    return num >= 32768 ? num - 65536 : num;\n}",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 460,
        "y": 620,
        "wires": [
            [
                "d76859e443cd98fc"
            ]
        ]
    },
    {
        "id": "d76859e443cd98fc",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "js函数转换",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 630,
        "y": 620,
        "wires": []
    },
    {
        "id": "769c583e15f9b628",
        "type": "inject",
        "z": "f77425d62009612d",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 110,
        "y": 720,
        "wires": [
            [
                "c69cb082f4d5391f"
            ]
        ]
    },
    {
        "id": "c758cfc4fd1cdcaf",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "（写）有符号数字",
        "func": "msg.payload = Int16BeToSigned16(msg.payload);\nreturn msg;\n/** \n * 负数转成对应的补码\n * 在计算机中，负数通常使用补码表示，如'-80'用补码表示为'65456'.\n */\nfunction Int16BeToSigned16(num) {\n    //如果数字小于0，将其转换成十进制补码：65536是2的16次幂，也就是2^16\n    if(num < 0){\n        num += 65536\n    }\n    return num;\n}",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 430,
        "y": 720,
        "wires": [
            [
                "4d2f5446435e62d1",
                "d5d6bcc7a95cd04b"
            ]
        ]
    },
    {
        "id": "4d2f5446435e62d1",
        "type": "modbus-write",
        "z": "f77425d62009612d",
        "name": "",
        "showStatusActivities": false,
        "showErrors": false,
        "showWarnings": true,
        "unitid": "2",
        "dataType": "MHoldingRegisters",
        "adr": "99",
        "quantity": "1",
        "server": "e7cbfcc879655084",
        "emptyMsgOnFail": false,
        "keepMsgProperties": false,
        "delayOnStart": false,
        "startDelayTime": "",
        "x": 640,
        "y": 720,
        "wires": [
            [
                "b71462a8db1024f6"
            ],
            []
        ]
    },
    {
        "id": "b71462a8db1024f6",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "debug 55",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 820,
        "y": 720,
        "wires": []
    },
    {
        "id": "d5d6bcc7a95cd04b",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "补码",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 610,
        "y": 680,
        "wires": []
    },
    {
        "id": "4ec96886cf6ddcfc",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "直接读取",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 460,
        "y": 540,
        "wires": []
    },
    {
        "id": "c69cb082f4d5391f",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "赋值",
        "func": "msg.payload = -90;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 250,
        "y": 720,
        "wires": [
            [
                "c758cfc4fd1cdcaf",
                "19cc1b023537db9f"
            ]
        ]
    },
    {
        "id": "19cc1b023537db9f",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "负数",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 370,
        "y": 680,
        "wires": []
    },
    {
        "id": "db6d11e622be6be8",
        "type": "comment",
        "z": "f77425d62009612d",
        "name": "3.1.2  16位负数写操作",
        "info": "",
        "x": 140,
        "y": 680,
        "wires": []
    },
    {
        "id": "cd5db39529d4197c",
        "type": "comment",
        "z": "f77425d62009612d",
        "name": "3.1.1  16位负数读操作",
        "info": "",
        "x": 140,
        "y": 540,
        "wires": []
    },
    {
        "id": "17422aec125ee1e5",
        "type": "comment",
        "z": "f77425d62009612d",
        "name": " 2.1 字符串写操作",
        "info": "",
        "x": 120,
        "y": 320,
        "wires": []
    },
    {
        "id": "5e6d79e257936ac0",
        "type": "inject",
        "z": "f77425d62009612d",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 110,
        "y": 360,
        "wires": [
            [
                "60a74c2ac2108159"
            ]
        ]
    },
    {
        "id": "60a74c2ac2108159",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "赋值",
        "func": "var str ='你好,Marry';\nmsg.payload = stringToByteArray(str);\nreturn msg;\n/**将一个字符串，获取每个字符的Unicode编码，转换为字节数组 */\nfunction stringToByteArray(str) {\n    let byteArray = [];\n    for (let i = 0; i < str.length; i++) {\n        byteArray.push(str.charCodeAt(i));\n    }\n    return byteArray;\n}",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 230,
        "y": 360,
        "wires": [
            [
                "48ccae615ccc0b4c",
                "ab1f56889919d10b"
            ]
        ]
    },
    {
        "id": "48ccae615ccc0b4c",
        "type": "modbus-write",
        "z": "f77425d62009612d",
        "name": "",
        "showStatusActivities": false,
        "showErrors": false,
        "showWarnings": true,
        "unitid": "2",
        "dataType": "MHoldingRegisters",
        "adr": "99",
        "quantity": "8",
        "server": "e7cbfcc879655084",
        "emptyMsgOnFail": false,
        "keepMsgProperties": false,
        "delayOnStart": false,
        "startDelayTime": "",
        "x": 380,
        "y": 360,
        "wires": [
            [],
            []
        ]
    },
    {
        "id": "ab1f56889919d10b",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "转换后",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 350,
        "y": 320,
        "wires": []
    },
    {
        "id": "3e34769f2f93e394",
        "type": "inject",
        "z": "f77425d62009612d",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 110,
        "y": 460,
        "wires": [
            [
                "2060ceec23e827b0"
            ]
        ]
    },
    {
        "id": "2060ceec23e827b0",
        "type": "modbus-getter",
        "z": "f77425d62009612d",
        "name": "",
        "showStatusActivities": false,
        "showErrors": false,
        "showWarnings": true,
        "logIOActivities": false,
        "unitid": "2",
        "dataType": "HoldingRegister",
        "adr": "99",
        "quantity": "8",
        "server": "e7cbfcc879655084",
        "useIOFile": false,
        "ioFile": "",
        "useIOForPayload": false,
        "emptyMsgOnFail": false,
        "keepMsgProperties": false,
        "delayOnStart": false,
        "startDelayTime": "",
        "x": 280,
        "y": 460,
        "wires": [
            [
                "674886974e9f1f90",
                "b88737723cab66a8"
            ],
            []
        ]
    },
    {
        "id": "674886974e9f1f90",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "函数转换",
        "func": "//将Unicode编码字节数组转换为对应的字符\nmsg.payload = String.fromCharCode(...msg.payload.slice(0, 8));\n//有需要的话可以去掉字符串中的null和结尾的空字符\nmsg.payload = msg.payload.trim().replace(/\\u0000/g, '');\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 460,
        "y": 460,
        "wires": [
            [
                "c6d5115b578ded31"
            ]
        ]
    },
    {
        "id": "b88737723cab66a8",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "直接读取",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 440,
        "y": 420,
        "wires": []
    },
    {
        "id": "c6d5115b578ded31",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "js函数转换",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 610,
        "y": 460,
        "wires": []
    },
    {
        "id": "629c93d9a5836ab0",
        "type": "comment",
        "z": "f77425d62009612d",
        "name": " 2.2  字符串读操作",
        "info": "",
        "x": 120,
        "y": 420,
        "wires": []
    },
    {
        "id": "e2b2a3da4860c56b",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "数组转换",
        "func": "msg.payload = int32ToArrayBE(msg.payload);\nreturn msg;\n/** 使用无符号整数大端序（BE）的转换方式，\n * 将一个32位整数，转换为一个包含两个元素的数组，\n * 其中第一个元素是高16位，第二个元素是低16位 */\nfunction int32ToArrayBE(num) {\n    const high = (num >> 16) & 0xFFFF;\n    const low = num & 0xFFFF;\n    return [high, low];\n}",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 360,
        "y": 80,
        "wires": [
            [
                "11e1bfef49c08c4d",
                "54919ad9449f2987"
            ]
        ]
    },
    {
        "id": "2057a2e62539d669",
        "type": "inject",
        "z": "f77425d62009612d",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 110,
        "y": 80,
        "wires": [
            [
                "c858d03ce2f7e8a2"
            ]
        ]
    },
    {
        "id": "11e1bfef49c08c4d",
        "type": "modbus-write",
        "z": "f77425d62009612d",
        "name": "",
        "showStatusActivities": false,
        "showErrors": false,
        "showWarnings": true,
        "unitid": "2",
        "dataType": "MHoldingRegisters",
        "adr": "99",
        "quantity": "2",
        "server": "e7cbfcc879655084",
        "emptyMsgOnFail": false,
        "keepMsgProperties": false,
        "delayOnStart": false,
        "startDelayTime": "",
        "x": 540,
        "y": 80,
        "wires": [
            [],
            []
        ]
    },
    {
        "id": "c858d03ce2f7e8a2",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "赋值",
        "func": "msg.payload = 3276780;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 230,
        "y": 80,
        "wires": [
            [
                "e2b2a3da4860c56b",
                "1438b02a5f7824dc"
            ]
        ]
    },
    {
        "id": "1438b02a5f7824dc",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "原始",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 350,
        "y": 40,
        "wires": []
    },
    {
        "id": "54919ad9449f2987",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "数组",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 510,
        "y": 40,
        "wires": []
    },
    {
        "id": "1da67750bf2f0eb1",
        "type": "comment",
        "z": "f77425d62009612d",
        "name": "1.1  32word写操作",
        "info": "",
        "x": 130,
        "y": 20,
        "wires": []
    },
    {
        "id": "dd7a84e126fda707",
        "type": "inject",
        "z": "f77425d62009612d",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 110,
        "y": 200,
        "wires": [
            [
                "7d73e7b22a1358f0"
            ]
        ]
    },
    {
        "id": "7d73e7b22a1358f0",
        "type": "modbus-getter",
        "z": "f77425d62009612d",
        "name": "",
        "showStatusActivities": false,
        "showErrors": false,
        "showWarnings": true,
        "logIOActivities": false,
        "unitid": "2",
        "dataType": "HoldingRegister",
        "adr": "99",
        "quantity": "2",
        "server": "e7cbfcc879655084",
        "useIOFile": false,
        "ioFile": "",
        "useIOForPayload": false,
        "emptyMsgOnFail": false,
        "keepMsgProperties": false,
        "delayOnStart": false,
        "startDelayTime": "",
        "x": 260,
        "y": 200,
        "wires": [
            [
                "4bf2a9d5169fa147",
                "9908852fe20a2380",
                "58decbf3f6230bed"
            ],
            []
        ]
    },
    {
        "id": "4bf2a9d5169fa147",
        "type": "function",
        "z": "f77425d62009612d",
        "name": "函数转换",
        "func": "/** 使用无符号整数大端序（Big-Endian）的转换方式，将一个一个包含两个元素的数组，转换为一个32位整数 */\nfunction arrayToInt32BE(data) {\n    return (data[0] << 16) | data[1];\n}\nmsg.payload = arrayToInt32BE(msg.payload);\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 440,
        "y": 200,
        "wires": [
            [
                "275aa03cf2080e7d"
            ]
        ]
    },
    {
        "id": "275aa03cf2080e7d",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "js函数转换",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 590,
        "y": 200,
        "wires": []
    },
    {
        "id": "9908852fe20a2380",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "直接读取",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 440,
        "y": 160,
        "wires": []
    },
    {
        "id": "58decbf3f6230bed",
        "type": "buffer-parser",
        "z": "f77425d62009612d",
        "name": "",
        "data": "payload",
        "dataType": "msg",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "type": "int32be",
                "name": "item1",
                "offset": 0,
                "length": 1,
                "offsetbit": 0,
                "scale": "1",
                "mask": ""
            }
        ],
        "swap1": "",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "resultType": "keyvalue",
        "resultTypeType": "return",
        "multipleResult": false,
        "fanOutMultipleResult": false,
        "setTopic": true,
        "outputs": 1,
        "x": 450,
        "y": 240,
        "wires": [
            [
                "342f36c555ec1252"
            ]
        ]
    },
    {
        "id": "342f36c555ec1252",
        "type": "debug",
        "z": "f77425d62009612d",
        "name": "parse转换",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 600,
        "y": 240,
        "wires": []
    },
    {
        "id": "e1215e288585f302",
        "type": "comment",
        "z": "f77425d62009612d",
        "name": "1.2  32word读操作",
        "info": "",
        "x": 130,
        "y": 140,
        "wires": []
    },
    {
        "id": "e7cbfcc879655084",
        "type": "modbus-client",
        "name": "tcp@192.168.2.105:1024",
        "clienttype": "tcp",
        "bufferCommands": true,
        "stateLogEnabled": false,
        "queueLogEnabled": false,
        "failureLogEnabled": true,
        "tcpHost": "192.168.2.105",
        "tcpPort": "1024",
        "tcpType": "DEFAULT",
        "serialPort": "/dev/ttyUSB",
        "serialType": "RTU-BUFFERD",
        "serialBaudrate": "9600",
        "serialDatabits": "8",
        "serialStopbits": "1",
        "serialParity": "none",
        "serialConnectionDelay": "100",
        "serialAsciiResponseStartDelimiter": "0x3A",
        "unit_id": "1",
        "commandDelay": "1",
        "clientTimeout": "1000",
        "reconnectOnTimeout": false,
        "reconnectTimeout": "2000",
        "parallelUnitIdsAllowed": true,
        "showWarnings": true,
        "showLogs": true
    }
]

回到目录