Forums

Wireless cables replacement technology?

Started by Neil Cherry June 26, 2008
I'm looking for a solution for wireless cable replacement. Basically I
would like to have some wireless technology that replaces cables from
point A to point b-z. I'm thinking about more than one RS232 cable and
I'll need to figure out the control mechanism for the control
pins. Anyone have any ideas? I'd be willing to build it myself so any
solutions would be of interest to me.

Thanks

-- 
Linux Home Automation         Neil Cherry       ncherry@linuxha.com
http://www.linuxha.com/                         Main site
http://linuxha.blogspot.com/                    My HA Blog
Author of:    	Linux Smart Homes For Dummies
On 2008-06-26, Neil Cherry <njc@cookie.uucp> wrote:

> I'm looking for a solution for wireless cable replacement.
What's wrong with WiFi?
> Basically I would like to have some wireless technology that > replaces cables from point A to point b-z. I'm thinking about > more than one RS232 cable
Does "I'm thinking about" mean "I need to replace"?
> and I'll need to figure out the control mechanism for the > control pins. Anyone have any ideas?
A couple multi-port serial->Ethernet converters and a WiFi link.
> I'd be willing to build it myself so any solutions would be of > interest to me.
-- Grant Edwards grante Yow! Hand me a pair of at leather pants and a CASIO visi.com keyboard -- I'm living for today!
On Thu, 26 Jun 2008 09:55:02 -0500, in comp.arch.embedded Neil Cherry
<njc@cookie.uucp> wrote:

>I'm looking for a solution for wireless cable replacement. Basically I >would like to have some wireless technology that replaces cables from >point A to point b-z. I'm thinking about more than one RS232 cable and >I'll need to figure out the control mechanism for the control >pins. Anyone have any ideas? I'd be willing to build it myself so any >solutions would be of interest to me. > >Thanks
You didn't say what distance, data rate, but maybe this http://www.nordicsemi.no/files/Prod_brief_Software_nRF2601_WDP.pdf martin
Hi,

Are the only connections you're looking to replace RS232 connections?
If you Google for something like wireless RS232 you should be able to
find tons of modules that do that. For example, I've worked with
these:

- the Wi.232* modules from http://www.radiotronix.com/

- the ZigBee modules from http://www.digi.com/

- http://www.lantronix.com/device-networking/embedded-device-servers/wiport=
.html

and I've built some myself using ChipCon parts, but that's really only
worth the effort if you need features that the existing modules can't
provide.

Regards,
-- Hauke D


On Jun 26, 4:55=A0pm, Neil Cherry <n...@cookie.uucp> wrote:
> I'm looking for a solution for wireless cable replacement. Basically I > would like to have some wireless technology that replaces cables from > point A to point b-z. I'm thinking about more than one RS232 cable and > I'll need to figure out the control mechanism for the control > pins. Anyone have any ideas? I'd be willing to build it myself so any > solutions would be of interest to me. > > Thanks
On Thu, 26 Jun 2008 09:55:02 -0500, Neil Cherry <njc@cookie.uucp>
wrote:

>I'm looking for a solution for wireless cable replacement.
The first question is WHY ? Is there some moving systems that can not use wire connections ? Or does the marketing droids think that the wireless connection are "sexy" ?
>Basically I >would like to have some wireless technology that replaces cables from >point A to point b-z.
Sounds multidrop to me.
>I'm thinking about more than one RS232 cable and >I'll need to figure out the control mechanism for the control >pins. Anyone have any ideas? I'd be willing to build it myself so any >solutions would be of interest to me.
You should look how RS-485 multidrop networks actually works and then apply this to the wireless networks. Paul
On Thu, 26 Jun 2008 10:02:45 -0500, Grant Edwards wrote:
> On 2008-06-26, Neil Cherry <njc@cookie.uucp> wrote: > >> I'm looking for a solution for wireless cable replacement. > > What's wrong with WiFi?
Nothing, but I'd like to check out other options too. I haven't started looking at Zigbee (or Xigbee?) and I'm aware of Bluetooth but I think that Bluetooth is overboard.
>> Basically I would like to have some wireless technology that >> replaces cables from point A to point b-z. I'm thinking about >> more than one RS232 cable > > Does "I'm thinking about" mean "I need to replace"?
I may switch from 'cable replacement' to an IP server instead.
>> and I'll need to figure out the control mechanism for the >> control pins. Anyone have any ideas? > > A couple multi-port serial->Ethernet converters and a WiFi > link.
Most of the terminal servers have Windows only solutions. I think there are Linux solutions so I'll check my notes. This becomes a cost balancing issue for terminal server vs small server. -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies
On Thu, 26 Jun 2008 19:10:51 +0300, Paul Keinanen wrote:
> On Thu, 26 Jun 2008 09:55:02 -0500, Neil Cherry <njc@cookie.uucp> > wrote: > >>I'm looking for a solution for wireless cable replacement. > > The first question is WHY ? > > Is there some moving systems that can not use wire connections ? > > Or does the marketing droids think that the wireless connection are > "sexy" ?
Because the customer wants it.
>>Basically I >>would like to have some wireless technology that replaces cables from >>point A to point b-z. > > Sounds multidrop to me.
Pretty much though each device may communicate independent of each other which isn't usually the way multidrop works (usually master/slave).
>>I'm thinking about more than one RS232 cable and >>I'll need to figure out the control mechanism for the control >>pins. Anyone have any ideas? I'd be willing to build it myself so any >>solutions would be of interest to me. > > You should look how RS-485 multidrop networks actually works and then > apply this to the wireless networks.
I work with networks so I am familiar with multidrop (usually SNA). I'm not sure which we I'll end up with, polling, multimaster or IP. Since I do so much IP I learn towards that technology but that would require a more powerful processor. -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies
On 2008-06-26, Neil Cherry <njc@cookie.uucp> wrote:

>>> and I'll need to figure out the control mechanism for the >>> control pins. Anyone have any ideas? >> >> A couple multi-port serial->Ethernet converters and a WiFi >> link. > > Most of the terminal servers have Windows only solutions. I > think there are Linux solutions so I'll check my notes.
FWIW, my employer makes serial<->Ethernet boxes that support Linux: http://www.comtrol.com/products/deviceservers. Some of the competitors also support Linux. -- Grant Edwards grante Yow! Am I SHOPLIFTING? at visi.com
Neil Cherry wrote:
>> >>> I'm looking for a solution for wireless cable replacement. > >>> Basically I >>> would like to have some wireless technology that replaces cables from >>> point A to point b-z.
>> Sounds multidrop to me. > > Pretty much though each device may communicate independent of > each other which isn't usually the way multidrop works (usually > master/slave).
Why are you trying to reinvent CSMA-CD or Ethernet?
On Jun 26, 4:55=A0pm, Neil Cherry <n...@cookie.uucp> wrote:
> I'm looking for a solution for wireless cable replacement. Basically I > would like to have some wireless technology that replaces cables from > point A to point b-z. I'm thinking about more than one RS232 cable and > I'll need to figure out the control mechanism for the control > pins. Anyone have any ideas? I'd be willing to build it myself so any > solutions would be of interest to me. > > Thanks
There are lots of options - ZigBee, Bluetooth, Wi-Fi, proprietary or custom solutions are all options, they all differ on range, data rate, power requirements, and ease of implementation (software support). I'm still not too clear on your requirements... What kind of devices are you connecting? Embedded/battery-powered devices or larger ones with a little more available power? What data rate and range do you need? What kind of data are you trying to send? Are you only replacing RS232 connections or are there other, maybe custom, comm protocols? Are you looking for ready-to-go modules in boxes that you just need to hook power+RS232 into, small radio modules that require some MCU work, or would you want to build your own radio+MCU solution? Regards, -- Hauke D