Modbus TCP 測試

Master / Slave 模擬測試

Slave 模擬設備環境 Exp. 192.168.11.247 : CentOS8 (PVE6 CT template)

yum install wget tar
wget https://www.modbusdriver.com/downloads/diagslave.tgz
tar -xvf diagslave.tgz
cd diagslave/linux_x86-64
./diagslave -m tcp

看執行畫面

Master 模擬控制環境 : CentOS8 (PVE6 CT template)

yum install wget tar
wget https://www.modbusdriver.com/downloads/modpoll.tgz
tar -xvf modpoll.tgz 
cd modpoll/linux_x86-64
./modpoll -m tcp 192.168.11.247

看執行畫面

Master Windows 模擬控制環境 : Win10 (IoT 元米科技 MODBUS TCP Client 測試程式) 看執行畫面

設定開機可以直接啟動

crontab -e

編輯內容如下:

@reboot /root/diagslave/linux_x86-64/diagslave -m tcp > /tmp/t.log

重開機後可以看到 /tmp/t.log 出現執行的紀錄訊息

參考網址 - https://unix.stackexchange.com/questions/148754/how-to-start-application-after-login-on-centos/235109

使用 Perl 開發 Client(Master) 程式

安裝環境 CentOS8 (PVE6 CT Template)

安裝相關模組套件

yum install perl gcc
perl -MCPAN -e shell
upgrade
force install Net::Server::MultiType
install Device::Modbus::TCP
exit

撰寫簡單讀取測試程式 t.pl

#! /usr/bin/perl
 
use Device::Modbus::TCP::Client;
use Data::Dumper;
use strict;
use warnings;
use v5.10;
 
my $client = Device::Modbus::TCP::Client->new(
    host => '192.168.1.34',
);
 
my $req = $client->read_holding_registers(
    unit     => 3,
    address  => 2,
    quantity => 1
);
 
say Dumper $req;
$client->send_request($req) || die "Send error: $!";
my $response = $client->receive_response;
say Dumper $response;
 
$client->disconnect;

perl t.pl

看執行結果

撰寫簡單寫入測試程式 t1.pl

#! /usr/bin/perl
 
use Device::Modbus::TCP::Client;
use Data::Dumper;
use strict;
use warnings;
use v5.10;
 
my $client = Device::Modbus::TCP::Client->new(
    host => '192.168.11.247',
);
 
# Write reg0 -> 12345
my $req = $client->write_single_register(
    unit     => 1,
    address  => 1,
    value    => 15
);

say Dumper $req;
$client->send_request($req) || die "Send error: $!";
my $response = $client->receive_response;
say Dumper $response;

 
$client->disconnect;

讀寫入的方式有以下幾種 : 參考網址 - https://metacpan.org/pod/Device::Modbus::Client
- $req = $client→read_coils(unit,address,quantity);
- $req = $client→read_discrete_inputs(unit,address,quantity);
- $req = $client→read_holding_registers(unit,address,quantity);
- $req = $client→read_input_registers(unit,address,quantity);
- $req = $client→write_single_coil(unit,address,value);
- $req = $client→write_single_register(unit,address,value);
- $req = $client→write_multiple_coils(unit,address,value); Example
```
my $req = $client->write_multiple_coils(
    unit     => 1,
    address  => 3,
    values   => [1, 1, 0, 1] 
);
```
- $req = $client→write_multiple_registers(unit,address,value); Example
```
my $req = $client->write_multiple_registers(
    unit     => 1,
    address  => 5,
    values   => [345, 65, 67, 243] 
);
```
- $req = $client→read_write_registers(unit,read_address,read_quantity,write_address,values); Example
```
my $req = $client->read_write_registers(
    unit     => 1,
    read_address  => 10,
    read_quantity =>  5,
    write_address => 9,
    values        => [ 45, 87, 1, 298, 0, 0] 
);
```

使用 PHP 開發 Client(Master) 程式

安裝環境 CentOS8 (PVE6 CT Template)

安裝相關模組套件

yum install php php-json
mkdir -p /root/php-modbus
cd /root/php-modbus
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') ===  '572cb359b56ad9ae52f9c23d29d4b19a040af10d6635642e646a7caa7b96de717ce683bd797a92ce99e5929cc51e7d5f') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
./composer.phar require aldas/modbus-tcp-client
./composer.phar require react/socket:^0.8.11

撰寫簡單讀取測試程式 t.php

mkdir -p /root/php-modbus/example
cd /root/php-modbus/example
vi t.php

參考網址

modbus, IoT