即报文(帧数据)由4部分构成:地址(Slave Number)+功能码(Function Codes)+数据(Data)+校验(Check)。其中的地址代表从设备的ID地址,作为寻址的信息。功能码表示当前的请求执行具体什么操作,比如读还是写。数据代表需要通讯的业务数据,可以根据实际情况来确定。最后一个校验则是验证数据是否有误。其中的功能码说明如下:...
The function codes recognized by Modbus are listed in the table below. Although this is not an exhaustive list of function codes, they are the most used and important ones to familiarize with. Figure 3 - Modbus Protocol | Function Codes Modbus error (exception) code explanation When a Modbus ...
PARITY with function codes 20 and 21 error code, the ERROR and reference type 6, to indicate NetEco resends a that the extended file area failed command for a to pass a consistency check. The maximum of three server or slave node cannot read times. ...
即报文(帧数据)由4部分构成:地址(Slave Number)+功能码(Function Codes)+数据(Data)+校验(Check)。其中的地址代表从设备的ID地址,作为寻址的信息。功能码表示当前的请求执行具体什么操作,比如读还是写。数据代表需要通讯的业务数据,可以根据实际情况来确定。最后一个校验则是验证数据是否有误。其中的功能码说明如下:...
Development Guide 1 Communication Protocol Table 1-8 Error code list No. Name Description 0x01 Invalid function code Slave nodes received unsupported or incorrect function codes. 0x02 Invalid parameter Slave nodes received invalid function code parameters. 0x03 Invalid data Slave nodes received...
即报文(帧数据)由4部分构成:地址(Slave Number)+功能码(Function Codes)+数据(Data)+校验(Check)。其中的地址代表从设备的ID地址,作为寻址的信息。功能码表示当前的请求执行具体什么操作,比如读还是写。数据代表需要通讯的业务数据,可以根据实际情况来确定。最后一个校验则是验证数据是否有误。其中的功能码说明如下:...
Modbus protocol defines several function codes for accessing Modbus registers. There are four different data blocks defined by Modbus, and the addresses or register numbers in each of those overlap. Therefore, a complete definition of where to find a piece of data requires both the address (or ...
/** * 生成发送帧 * @param slaveAddress 从站地址 * @param registerAddress 寄存器地址 * @param registerLength 写入数据长度 */ fun genReadSingleRegister(slaveAddress: Int, registerAddress: Int, registerLength: Int): ByteArray { // 功能码:写单个寄存器 val functionCode = 0x03 // 构建 Modbus ...
function code 16 and read with function code 3. If the device address 0 (broadcast address is selected, the times of all devices to this bus are simultaneously reset. 2 Specific Modbus Function Codes 2.7Supported MODBUS Error Messages 2.7Supported MODBUS Error MessagesException Response T...
Every method accepts an objectoptionswhich have defaults parameters (likeaddress = 0) and a callback, in case you want to see the response from the remote device. Here is a list of supported function codes and the corresponding methods: ...