[#401849] If statement — Masoud Ahmadi <lists@...>

Will anyone be able to point out what I am doing wrong.

15 messages 2012/12/02

[#401987] Trying to get "translator" to work — JD KF <lists@...>

So, basically, I'm trying to get the below code to work properly for

12 messages 2012/12/06

[#402012] Need help to select some listbox item in different listbox together — Jonathan Masato <lists@...>

Hello,

10 messages 2012/12/07

[#402045] if n belongs to set a and m belongs to set b repeat some steps, How? — "zubair a." <lists@...>

We can do so in java and similar languages like:

11 messages 2012/12/08

[#402078] Time.new(2001, 12, 3).to_i returns wrong value — Robert Buck <lists@...>

I am doing something that not many do, I am writing a database driver

9 messages 2012/12/09

[#402145] How I can create/extract a variable/hash into the current binding in Ruby? — Ramon de C Valle <rcvalle@...>

Hi,

12 messages 2012/12/12

[#402205] Wondering About Flatiron School — "Kevin Y." <lists@...>

Hi everyone!,

35 messages 2012/12/15
[#402207] Re: Wondering About Flatiron School — Chad Perrin <code@...> 2012/12/15

On Sat, Dec 15, 2012 at 11:51:08AM +0900, Kevin Y. wrote:

[#402214] Ruby quick reference arranged in ASCII sequence? — Old Grantonian <lists@...>

As a ruby beginner, I would be grateful for any links to a ruby

17 messages 2012/12/15

[#402226] print - and strip text between tags using Nokogiri — Paul Mena <lists@...>

I'm a Ruby Newbie trying to write a program to process thousands of HTML

13 messages 2012/12/15

[#402332] Perl to Ruby: regex captures to assignment. — "Derrick B." <lists@...>

Hello all,

37 messages 2012/12/19
[#402342] Re: Perl to Ruby: regex captures to assignment. — "Derrick B." <lists@...> 2012/12/20

First of all, thanks for the fast responses!

[#402352] Re: Perl to Ruby: regex captures to assignment. — Robert Klemme <shortcutter@...> 2012/12/20

On Thu, Dec 20, 2012 at 1:38 AM, Derrick B. <lists@ruby-forum.com> wrote:

[#402357] Re: Perl to Ruby: regex captures to assignment. — "Derrick B." <lists@...> 2012/12/20

Robert Klemme wrote in post #1089733:

[#402359] trying to strip characters from a line — Paul Mena <lists@...>

I'm reading a table from a MySQL database and then processing it row by

18 messages 2012/12/20

[#402394] simple division: -9 / 5 = -2 what? — "Derrick B." <lists@...>

$ irb

13 messages 2012/12/22

[#402412] POLS and string-handling — Paul Magnussen <lists@...>

Hi,

14 messages 2012/12/22

[#402460] "Open" dialog of Windows — "Damián M. González" <lists@...>

Hi guys, been researching about pop up the "open" file dialog of

11 messages 2012/12/24

[#402466] How do I install Ruby on my Ubuntu 12.10 partition. — Kaye Ng <lists@...>

I already have Ruby installed on my Windows 7 partition.

23 messages 2012/12/25

[#402510] Ruby Association Certified Ruby Programmer — Sean Westfall <lists@...>

How well respected is this certification in the industry: Ruby

27 messages 2012/12/27
[#402528] Re: Ruby Association Certified Ruby Programmer — Peter Hickman <peterhickman386@...> 2012/12/27

On 27 December 2012 01:28, Sean Westfall <lists@ruby-forum.com> wrote:

[#402555] numeric? — Brandon Weaver <keystonelemur@...>

I've found a bit of an annoyance trying to find out if a number is numeric

20 messages 2012/12/27

[#402580] Ruby Koans regarding Hashes. — "Derrick B." <lists@...>

I am trying to understand this, so let me know how I do. :) I know

18 messages 2012/12/28

[#402609] can't open new ruby program under "new" context menu — "Lee V." <lists@...>

I'm stuck on the new version at trying to do something very simple.

10 messages 2012/12/28

[#402642] require "test/unit" — "Mattias A." <lists@...>

Hi,

17 messages 2012/12/29
[#402667] Re: require "test/unit" — "Mattias A." <lists@...> 2012/12/31

Hi Dami=C3=A1n M. Gonz=C3=A1lez!

[#402747] Re: require "test/unit" — "Derrick B." <lists@...> 2013/01/04

Mattias A. wrote in post #1090700:

[#402749] Re: require "test/unit" — sto.mar@... 2013/01/04

Am 04.01.2013 19:48, schrieb Derrick B.:

Re: Comunication via rs485

From: Brian Candler <lists@...>
Date: 2012-12-26 22:14:56 UTC
List: ruby-talk #402509
iosu bueno wrote in post #1090230:
> Brian Candler wrote in post #1089866:
>> Google "ruby serial port"
>
> Im already using serialport gem in my project, but as they say in their
> page "Ruby/SerialPort is a Ruby library that provides a class for using
> RS-232 serial ports" so i dont know if I can use it to comunicate via
> rs485 or just rs232

Have you googled for the difference between RS232 and RS485? Also, you 
haven't said what hardware you want to use to connect your PC to RS485, 
nor what protocol you are going to use, nor what operating system you 
are using.

If this is just a long-reach point-to-point asynchronous serial link, 
then RS232 and RS485 are basically the same thing but with different 
electrical properties. If you are using an RS232-to-RS485 level shifter, 
or an RS485 card with a 16550A-compatible UART, then it will appear just 
like an RS232 serial port.

However if you are trying to do something cleverer, e.g. talk on an 
RS485 shared multipoint bus, you may have more work to do, e.g. turning 
the line driver on and off at the right times. This *might* still be 
drivable like an RS232 serial port, e.g. raising and lowering DTR might 
turn the transmit driver on and off. You'll need to read the 
documentation for the hardware and OS drivers you're using.

-- 
Posted via http://www.ruby-forum.com/.

In This Thread