On Jun 26, 10:55=A0am, 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
>
> --
> Linux Home Automation =A0 =A0 =A0 =A0 Neil Cherry =A0 =A0 =A0 nche...@lin=
> Author of: =A0 =A0 =A0Linux Smart Homes For Dummies
Neil:
I don't see any information here about what the cost needs to be, the
quantities, the market, home or industry. Are these devices, for
instance
destined for home automation? Who will install and troubleshoot these
devices? Smart folks? dum folks?
I am assuming that you would be considering bottom-up re-design at
physical layer to save $$$
Chris
Reply by Hauke D●June 27, 20082008-06-27
Hi,
It sounds like any of the existing RS232-over-wireless products would
probably work for you. Some other things to narrow it down would be
comm range and cost. Google should show you plenty of options.
Also, you mentioned that you want multiple nodes (B-Z) to communicate
with one central point (A), if I understand that correctly? If point A
is a PC or other network-capable device, then some of the RS232-to-
WiFi products might be interesting for you - for example, the
Lantronix WiPort has two serial ports that you can simply telnet into
through the WiFi connection.
Otherwise, if these are just embedded devices, then WiFi is probably
overkill for your needs, and Bluetooth has a somewhat limited range.
That leaves any of the ZigBee or custom protocols, which are just fine
for the baud rates you're looking at.
Regards,
-- Hauke D
On Jun 27, 4:00=A0am, Neil Cherry <n...@cookie.uucp> wrote:
> > 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?
>
> Right now I'm just investigating, I have almost no solid requirements.
> I just want to know what's available. We may buy, we could build, most
> likely its async, byte oriented, most likely RS232. The speed would
> probably be 4800 - 56k, probably a lot of 9600. All the device would
> have AC power.
Reply by Warren Block●June 27, 20082008-06-27
Neil Cherry <njc@cookie.uucp> wrote:
>
> Right now I'm just investigating, I have almost no solid requirements.
> I just want to know what's available. We may buy, we could build, most
> likely its async, byte oriented, most likely RS232. The speed would
> probably be 4800 - 56k, probably a lot of 9600. All the device would
> have AC power.
You might find the Wireless/Modem and Bluetooth sections at sparkfun.com
interesting.
--
Warren Block * Rapid City, South Dakota * USA
Reply by Neil Cherry●June 26, 20082008-06-26
On Thu, 26 Jun 2008 14:48:10 -0700 (PDT), Hauke D wrote:
> On Jun 26, 4:55�pm, 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?
Right now I'm just investigating, I have almost no solid requirements.
I just want to know what's available. We may buy, we could build, most
likely its async, byte oriented, most likely RS232. The speed would
probably be 4800 - 56k, probably a lot of 9600. All the device would
have AC power.
--
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
Reply by Neil Cherry●June 26, 20082008-06-26
On Thu, 26 Jun 2008 21:55:01 +0200, Lanarcam wrote:
> 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?
??? What gave you the idea that I'm trying to reinvent CSMA-CD or
Ethernet? Besides WiFi doesn't use either CSMA-CD (it uses CSMA/CA)
or Ethernet. ;-)
Right now I haven't decided whether I'm going layer 1 replacement or
IP. If it's a layer 1 (cable) replacement then the end points won't
know anything about the wireless protocol.
--
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
Reply by Hauke D●June 26, 20082008-06-26
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
Reply by Lanarcam●June 26, 20082008-06-26
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?
Reply by Grant Edwards●June 26, 20082008-06-26
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
Reply by Neil Cherry●June 26, 20082008-06-26
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
Reply by Neil Cherry●June 26, 20082008-06-26
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