modbus

问题 I am trying to integrate modbus library given by libmodbus into a custom MFC project in Visual Studio 2010. The steps that I have followed till now are as follows: 1) I have created project in Visual Studio 2010 as shown in snapshots below: 2) I have edited the code to include a small hello world code just to check if it compiles. 3) I have copied .c and .h files from src folder of libmodbus-3.0.3 to Visual Studio project folder as shown below and included them in the project. 4) When I try

问题 I' trying to connect from my Mac laptop to a Modbus device (MR-SI4) using a serial connection using a USB RS485 converter that gets "mounted" to /dev/cu.SLAB_USBtoUART . This is my code: import logging logging.basicConfig() log = logging.getLogger() log.setLevel(logging.DEBUG) from pymodbus.constants import Endian from pymodbus.constants import Defaults from pymodbus.payload import BinaryPayloadDecoder from pymodbus.client.sync import ModbusSerialClient as ModbusClient from pymodbus

问题 I have this byte array: static byte[] buf = new byte[] { (byte) 0x01, (byte) 0x04, (byte)0x00, (byte)0x01,(byte)0x00, (byte) 0x01}; Now, the CRC checksum of this byte array is supposed to be 0x60, 0x0A. I want the Java code to recreate this checksum, however I cant seem to recreate it. I have tried crc16: static int crc16(final byte[] buffer) { int crc = 0xFFFF; for (int j = 0; j < buffer.length ; j++) { crc = ((crc >>> 8) | (crc << 8) )& 0xffff; crc ^= (buffer[j] & 0xff);//byte to int, trunc

问题 Problem pymodbus master/client can send a request to the slave/server. The slave/server make the things to return ready and is waiting for the master/client to pick them up. Despite the readiness of the server/slave, the master/client just returns the error "Modbus Error: [Input/Output] Modbus Error: [Invalid Message] Incomplete message received, expected at least 2 bytes (0 received)". Setup I use the laptop as server/slave with this adapter: https://www.amazon.com/dp/B076WVFXN8/ref=twister

问题 I am having a lot of trouble on generating a modbus CRC16 code using PHP. I have found a lot of different codes over the internet but i have tried them and for some reason i didnt get right results. I have found a PHP code for generating CRC16-CCITT. I have chenge the look up table to the modbus CRC corresponding table but the result is still not the right one. The code is bellow. What do i need to do more in order to transform a CRC16-CCITT code into CRC16-MODBUS code. <?php /***************

问题 I'm IoT newbie and I have a project with Schneider Power Meter. I read voltage raw data from registers using pymodbus but I don't know how to convert it to the correct value. Raw data is [24206, 17242] from registers address 3927-3928 . Here is my code : from pymodbus.client.sync import ModbusSerialClient as ModbusClient def main(): try: register = int(input("Registers: ")) modbus = ModbusClient(method='rtu', port='COM4', baudrate=9600, timeout=1, parity='E', bytesize=8 ) modbus.connect() r =

问题 I have this MATLAB Code: function [s] = serialstart(opt) % Function for initializing a serial interface in matlab for interfacing % Functions using the serial port must be passed the serial port object % s in order for the serial port to be accessible. port = 502; s = tcpip('192.168.2.177',port); %????? set(s, 'InputBufferSize', 3000000); % Initialize serial port on specified com port date_addr = 40001; date_num=1; date_addr_high = floor(date_addr/100); date_addr_low = mod(date_addr,100);

问题 I'm trying to connect to PLC using ModBus protocol. I'm calling ModBus connect method from thread and I'm getting exception that I'm running communications on the main thread... I wonder where it escapes... Exception: 08-02 10:48:44.461: W/System.err(4395): android.os.NetworkOnMainThreadException 08-02 10:48:44.471: W/System.err(4395): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099) 08-02 10:48:44.471: W/System.err(4395): at Code: package com.kikudjiro.android

问题 I am trying to build a communication between Matlab and a Watlow F4 temperature controller via Modbus RTU. My code looks like this so far: obj = serial('COM4'); fopen(obj); set(obj, 'BaudRate', 9600); set(obj, 'Terminator', 'CR'); set(obj, 'Timeout', 100); set(obj, 'InputBufferSize', 3000); now I am trying to read register 100. The address of the controller is 1. fwrite(obj, [1 3 00 100 0 1 197 213]); fread(obj, 7); but then the following error occurs: Warning: Unsuccessful read: The

问题 I am using pymodbus to read a register on a Wago 750-881 PLC. I am also reading the same register on the Modbus Poll utility, as well as, an HMI. The Modbus Poll and HMI are reading correctly, but the pymodbus program is not. Here is the code: from pymodbus.client.sync import ModbusTcpClient c = ModbusTcpClient(host="192.168.1.20") chk = c.read_holding_registers(257, 1, unit = 1) response = c.execute(chk) print response.getRegister(0) Here is the response from running the code: >>> runfile('C