Ruby implementation of KORAD KA series power supplies communication protocol. Verified on KA3005P only, but should work also with all supplies of series, including multichannel ones.

Korad_KA_series_driver.rb

require 'rubygems'
require 'serialport'

class Korad
  def initialize(port="/dev/ttyACM0", baud=9600)
    @serial = SerialPort::open(port,baud)
    @serial.read_timeout = 100
  end

  def get_status
    command("STATUS?")
    @serial.read(1).ord.to_s(2)
  end

  def get_idn
    return feedback_command("*IDN?")
  end

  def turn_on
    command("OUT1")
  end

  def turn_off
    command("OUT0")
  end

  def recall_memory(bank)
    command("RCL#{bank}")
  end

  def save_memory(bank)
    command("SAV#{bank}")
  end

  def turn_on_OCP
    command("OCP1")
  end

  def turn_off_OCP
    command("OCP0")
  end

  def turn_on_OVP
    command("OVP1")
  end

  def turn_off_OVP
    command("OVP0")
  end
  
  def set_tracking_mode(value = :independent)
    mode = [:independent, :series, :parallel].index(value)
    mode ? command("TRACK#{mode}") : raise(Exception.new("UnknownModeException"))
  end

  def set_current(channel, value)
    command("ISET#{channel}:#{value}")
  end

  def set_voltage(channel, value)
    command("VSET#{channel}:#{value}")
  end

  def get_stored_current(channel)
    return feedback_command("ISET#{channel}?")
  end

  def get_stored_voltage(channel)
    return feedback_command("VSET#{channel}?")
  end

  def get_output_current(channel)
    return feedback_command("IOUT#{channel}?")
  end

  def get_output_voltage(channel)
    return feedback_command("VOUT#{channel}?")
  end

  private
    def feedback_command(text)
      command(text)
      filtered_output
    end

    def command(text)
      @serial.write(text)
    end

    def filtered_output
      result = @serial.read(200)
      result ? result.each_byte.reject{|i| i== 1}.map{|a| a.chr}.join : result
    end
end

#example:
korad = Korad.new
puts korad.set_voltage(1,7)
sleep(0.1)
puts korad.get_idn