正在学Python小试牛刀访问modbus从站点（6楼加了一个JS版的）

McuPlayer · 发表于 2018-9-24 23:49:29

本帖最后由 McuPlayer 于 2018-9-25 11:00 编辑

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
from socket import *
HOST ='192.168.100.21'
PORT = 502 # The default port for modbus-TCP
ADDR = (HOST,PORT)
# transactionID Protocol DatSize Addr CMD paramter
cmd = bytes([ 0x12, 0x34, 0, 0, 0, 6, 0x09, 0x03, 0, 0, 0, 2 ]);
tcp = socket(AF_INET,SOCK_STREAM) # create a Socket
tcp.connect(ADDR) # connect to Server
tcp.send(cmd) # Send a command-frame
ack = tcp.recv(13) # receive a answer-frame
tcp.close() # close the tcp-connection
def trans(s):
return " ".join('0x%.2x' % x for x in s)
print( "\n" )
print( "Send: ", trans(cmd) ) # cmd to station
print( "Recv: ", trans(ack) ) # ack from station
print( "\n" )
print( "CMD->Transaction ID:%d" % (cmd[0]*256+cmd[1]) )
print( "CMD->Protocol ID:%d" % (cmd[2]*256+cmd[3]) )
print( "CMD->Data Size:%d" % (cmd[4]*256+cmd[5]) )
print( "CMD->Device Addr:%d" % (cmd[6]) )
print( "CMD->Operation CMD:%d" % (cmd[7]) )
print( "CMD->Register Addr:%d" % (cmd[8]*256+cmd[9]) )
print( "CMD->Register Count:%d" % (cmd[10]*256+cmd[11]) )
print( "\n" )
print( "ACK->Transaction ID:%d" % (ack[0]*256+ack[1]) )
print( "ACK->Protocol ID:%d" % (ack[2]*256+ack[3]) )
print( "ACK->Data Size:%d" % (ack[4]*256+ack[5]) )
print( "ACK->Device Addr:%d" % (ack[6]) )
print( "ACK->Operation CMD:%d" % (ack[7]) )
print( "ACK->Raw Data Size:%d" % (ack[8]) )
print( "ACK->Register[0000]:%d" % (ack[9]*256+ack[10]) )
print( "ACK->Register[0001]:%d" % (ack[11]*256+ack[12]) )

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因为打算给客户演示用，所以有一大半代码是Print

lwy86 · 发表于 2018-9-25 00:20:33

不是有Modbus库玛？
modbus_tk

NM2012 · 发表于 2018-9-25 07:26:39

学习一下最近也在关于python

墨非 · 发表于 2018-9-25 09:33:19

python的话推荐使用库 pymodbus https://github.com/riptideio/pymodbus

Excellence · 发表于 2018-9-25 09:44:20

谢谢分享。。。。。。

McuPlayer · 发表于 2018-9-25 10:57:03

var net = require('net');
var HOST = '127.0.0.1';
var PORT = 502;
// transactionID Protocol DatSize Addr CMD-ReadReg CMD-Reg-Addr CMD-Reg-Count
const cmd = Buffer.from([ 0x55, 0xAA, 0, 0, 0, 6, 0x09, 0x03, 0x13, 0x94, 0, 2 ]);
var tcp = new net.Socket();
tcp.connect(PORT, HOST, function() {
console.log('CONNECTED TO: ' + HOST + ':' + PORT);
});
tcp.on('data', function(ack){
var sLine = "Recv: ";
for(var i=0;i<ack.length;i++)
sLine += ack[i].toString(16) + ' ';
console.log( sLine );
// console.log( '\n' )
console.log( "CMD->Transaction ID:" + (cmd[0]*256+cmd[1]) )
console.log( "CMD->Protocol ID:" + (cmd[2]*256+cmd[3]) )
console.log( "CMD->Data Size:" + (cmd[4]*256+cmd[5]) )
console.log( "CMD->Device Addr:" + (cmd[6]) )
console.log( "CMD->Operation CMD:" + (cmd[7]) )
console.log( "CMD->Register Addr:" + (cmd[8]*256+cmd[9]) )
console.log( "CMD->Register Count:" + (cmd[10]*256+cmd[11]) )
// console.log( "\n" )
console.log( "ACK->Transaction ID:" + (ack[0]*256+ack[1]) )
console.log( "ACK->Protocol ID:" + (ack[2]*256+ack[3]) )
console.log( "ACK->Data Size:" + (ack[4]*256+ack[5]) )
console.log( "ACK->Device Addr:" + (ack[6]) )
console.log( "ACK->Operation CMD:" + (ack[7]) )
console.log( "ACK->Raw Data Size:" + (ack[8]) )
console.log( "ACK->Register[" + (cmd[8]*256+cmd[9]+0) + "]:" + (ack[9]*256+ack[10]) )
console.log( "ACK->Register[" + (cmd[8]*256+cmd[9]+1) + "]:" + (ack[11]*256+ack[12]) )
});
tcp.on('close', function() {
console.log('Connection closed');
});
var nCnt = 0;
setInterval(function(){
console.log( ">>>>---------------------------------------->>>" )
var Tim = new Date();
console.log( Tim.getFullYear() + '.' + Tim.getMonth() + '.' + Tim.getDate() + '-' + Tim.getHours() + ':' + Tim.getMinutes() + ':' + Tim.getSeconds() )
tcp.write(cmd);
var sLine = "Send: ";
for(var i=0;i<cmd.length;i++)
sLine += cmd[i].toString(16) + ' ';
console.log( sLine );
if(nCnt>10)
client.destroy();
nCnt++;
},3000);

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再贴一个js版本的，浏览器只支持websocket不支持纯Socket，可以在nodejs环境下可以Run

msa0886 · 发表于 2018-9-27 21:32:58

关注，近期也在学习Python。

lonely9391 · 发表于 2018-9-27 23:58:13

大家学 Python 都打算用来干嘛

arndei · 发表于 2018-9-28 08:51:04

好多人都在学python呀

Maurice · 发表于 2019-10-11 01:11:46

搞个友好窗体界面的话咋实现？

正在学Python小试牛刀访问modbus从站点（6楼加了一个JS版的）

阿莫论坛20周年了！感谢大家的支持与爱护！！