timers_rmodbus.rb

require 'colorize'
require 'rmodbus'
require 'timers'
ip="10.0.0.2"
sl1 = ModBus::TCPClient.new(ip).with_slave(1)
timers = Timers::Group.new
now_and_every_five_seconds = timers.now_and_every(0.001) {
  begin
    sl1.holding_registers[0..1000]; puts "read #{Time.now.to_i}".green
  rescue Exception =>e
    puts "read exception".blue
  end
}

now_and_every_five_seconds_1 = timers.now_and_every(0.01) {
  begin
    sl1.holding_registers[0..10]=(0..10).to_a.map{|e| e*rand(10)}; puts "write #{Time.now.to_i}".red
  rescue Exception =>e
    puts ('write exception').yellow
    sleep(2)
  end
}

loop { timers.wait }