From: Chris Lowis <chris.lowis@...>
Date: 2008-12-08T20:31:02+09:00
Subject: Re: Ruby Serial Port for windows

> Any one has a functional snippet of a rs232 or serial port
> communication code that I could use? I'd greatly appreciate the help!

Here's some code I used to interface with a Druck barometer over rs232 :

class DruckInterface
  require 'Win32Serial'

  def initialize
    @port = Win32Serial.new
    @port.open("COM1")
    # 9600 baud / 8 bytesize / no parity / 1 stopbit
    @port.config(9600, 8, Win32Serial::NOPARITY, 
Win32Serial::ONESTOPBIT)
    # optionally configure timeouts
    @port.timeouts(0, 200, 0, 0, 0)
  end

  def read_pressure
    @port.write(":UNIT MBAR;\r") # Switch measurement units to mBar
    sleep(1)
    @port.write(":SENS:PRES?;:UNIT?;\r")
    response = @port.read(39)
    @port.write(":UNIT PSI;\r") # Reset measurement units to PSI
    @port.close

    pressure_str,unit_str = response.split(';')
    pressure = pressure_str.split[1].to_f
    unit = unit_str.split[1].downcase

    return "#{pressure} #{unit}"
  end
end

I used the win32serial library here :
http://grub.ath.cx/win32serial/

which worked fine on my system (Windows XP sp3, using cygwin ruby, but I 
think it'll work with the one-click version of Ruby)

Hope this helps,

Chris
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