i know there are a few radio hams on here, and other knowledgeable people
when it comes to electronics and the like,

i've got a cctv system in my aviary, the dvr is located about 30 feet from
the house, video is sent to the bedroom and living room tv via a length of
RG6,

basically i want to use a PTZ controller in either location (bedroom or
living room) without having to faff about with wires,

standard way is to run some twisted pair wire from the back of the ptz
controller to the cams, but i cant do that really as i want to be able to
move the ptz controller about with ease, and not faff about changing wires
over, fitting and removing terminating resistors and all that.

So i want to send the ptz control signals wirelessly, the ptz signals are
sent using RS485, at 9600 baud,

ideally i'd like to be able to buy a couple of small radio modules, connect
the data out from the ptz controller to the data in pins on one module,
apply power,
and at the other end, data out to the data in on the cameras and power, and
have it work... with a little setting up i guess to set the baud rate etc.

searching the net i can find lots of hits for radio telemetry solutions, but
they are the 5 grand systems used on those wireless cctv cameras put up
outside trouble makers homes by the council, and send the video back as well
as relaying the ptz signal and work over many kilometers,
or possibly modules that might work, but from china with limited
documentation on them,

i need basic ptz signals sent one way over about 50 feet max, and as cheap
as possible, and if possible using modules bought in the uk,

the ptz controller runs on 12 volts, and i will put in batteries to get that
voltage, i imagine a radio modem type thing will want 5 volts, so no probs
putting in a regulator for that,

Any help gratefully appreciated.

"Gazz" wrote in message ...
i know there are a few radio hams on here, and other knowledgeable people
when it comes to electronics and the like,

i've got a cctv system in my aviary, the dvr is located about 30 feet from
the house, video is sent to the bedroom and living room tv via a length of
RG6,

basically i want to use a PTZ controller in either location (bedroom or
living room) without having to faff about with wires,

standard way is to run some twisted pair wire from the back of the ptz
controller to the cams, but i cant do that really as i want to be able to
move the ptz controller about with ease, and not faff about changing wires
over, fitting and removing terminating resistors and all that.

So i want to send the ptz control signals wirelessly, the ptz signals are
sent using RS485, at 9600 baud,

ideally i'd like to be able to buy a couple of small radio modules,
connect the data out from the ptz controller to the data in pins on one
module, apply power,
and at the other end, data out to the data in on the cameras and power,
and have it work... with a little setting up i guess to set the baud rate
etc.

searching the net i can find lots of hits for radio telemetry solutions,
but they are the 5 grand systems used on those wireless cctv cameras put
up outside trouble makers homes by the council, and send the video back as
well as relaying the ptz signal and work over many kilometers,
or possibly modules that might work, but from china with limited
documentation on them,

i need basic ptz signals sent one way over about 50 feet max, and as cheap
as possible, and if possible using modules bought in the uk,

the ptz controller runs on 12 volts, and i will put in batteries to get
that voltage, i imagine a radio modem type thing will want 5 volts, so no
probs putting in a regulator for that,

I'd use a wireless ip PTZ camera myself. Plenty of those about.

"Owain" wrote in message
...
On Jul 12, 1:46 am, "Gazz" wrote:
i need basic ptz signals sent one way over about 50 feet max, and as
cheap
as possible, and if possible using modules bought in the uk,

RS (and therefore others) have RF data modules, you'd have to convert
from RS485 to CMOS/TTL signals though and that's a design job.
http://uk.rs-online.com/web/p/radio-...dules/5056812/

Rather than sending RS485 over RF, would it be possible to put the PTZ
controller near the camera, and use radio control switches to mimic
pressing the PTZ controller buttons. That way you only need to carry
switch impulses over RF rather than data. Remote control sockets in a
pack of 1 controller and 3 sockets are quite cheap.

the ptz controller has quite a few buttons to press, but more impotriantly
it has an analog joystick, which varies the pan and tilt speed depending on
how far you shove it in the direction you want,

i do have an infra red ptz controller and the dvr has ptz controll built in,
and using a couple of those remote extenders i can use the infrared remotes,
but it's the variable speed and multi direction of the joystick i want the
most,

not to mention, the dvr's built in ptz controll is very clunky... despite
having arrow keys on the remote, you cant use them to direct the camera...
instead you use them to select the arrow on screen, then press the centre
button to move the cam in that position, to zoom in, it's down arrow 4
times, then accross, then enter button and so on, bloody annoying and i
havent even mentioned the ptz overlay on the screen that covers the right
hand third of the picture,

The ptz remote unit is a little better, the arrow keys move the cam, and it
has dedicated keys for zoom, iris and focus controls and presets etc, but
again, it's the lack of the analog joystick i miss, can't even move the cam
diagonaly using the infrared remote ptz unit,


i am wondering about using rs485 to rs232 converters, as there seem to be
plenty of rs232 radio links, but it just adds to the complexity and things
to go wrong,

"Gazz" wrote in message ...


"Owain" wrote in message
...
On Jul 12, 1:46 am, "Gazz" wrote:
i need basic ptz signals sent one way over about 50 feet max, and as
cheap
as possible, and if possible using modules bought in the uk,

RS (and therefore others) have RF data modules, you'd have to convert
from RS485 to CMOS/TTL signals though and that's a design job.
http://uk.rs-online.com/web/p/radio-...dules/5056812/

I have found the following:
http://www.ebay.co.uk/itm/260506098546

of course its in china, and i cant seem to see any data sheet links on the
sellers page,
a few things bothering me tho, says 1 mile range... way too much for me, and
hence will waste battery power, but then it says 300m distance, and mentions
signal levels, and only lists rs232 : 4.5 - 5.5v,
i read somewhere rs485 is 1.5v to around 5v,

Wonder if it'd work for what i want tho... would really have liked a bit
cheaper, but i guess it's the rs485 bit, rs232 radio links being much more
prevelent and thus cheaper.

On 12/07/2012 02:18, Gazz wrote:

i am wondering about using rs485 to rs232 converters, as there seem to
be plenty of rs232 radio links, but it just adds to the complexity and
things to go wrong,

I was under the impression the RS485 was simply an EIA standard for a
differential drive bus - so I would not be surprised if in these
situations that require relatively low speed serial data connections,
the actual comms circuitry is basically a conventional serial data link
like that used with RS232. Any chance of popping the lid of something
and playing hunt the UART?


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Jul 12, 3:41*am, John Rumm wrote:
On 12/07/2012 02:18, Gazz wrote:

i am wondering about using rs485 to rs232 converters, as there seem to
be plenty of rs232 radio links, but it just adds to the complexity and
things to go wrong,

I was under the impression the RS485 was simply an EIA standard for a
differential drive bus -

It is. Nothing to do with data formats. It's basically RS 422 with
bidirectional drivers so you can do half-duplex on the same wires.
That's a higher layer and does require some protoicol to be
implemented.

so I would not be surprised if in these
situations that require relatively low speed serial data connections,
the actual comms circuitry is basically a conventional serial data link
like that used with RS232. Any chance of popping the lid of something
and playing hunt the UART?

RS485 transceivers are dirt cheap.

MBQ

Man at B&Q" wrote
I was under the impression the RS485 was simply an EIA standard for a
differential drive bus -

It is. Nothing to do with data formats. It's basically RS 422 with
bidirectional drivers so you can do half-duplex on the same wires.
That's a higher layer and does require some protoicol to be
implemented.

so I would not be surprised if in these
situations that require relatively low speed serial data connections,
the actual comms circuitry is basically a conventional serial data link
like that used with RS232. Any chance of popping the lid of something
and playing hunt the UART?

RS485 transceivers are dirt cheap.

please point me to a site where i can buy a couple then please, as i'm
getting lost with all the tat from china out there that may or may not do
the job.

unfortunately, i know just enough about electronics to get me into trouble,
and all these data protocols and stuff is pretty confusing,

i'd love to find a plug and play option, or something that needs only a
little tinkering to get working, dont want to end up with yet another box of
bits and pieces that almost worked but didnt hidden at the back of the shed.

On 12/07/2012 01:46, Gazz wrote:

ideally i'd like to be able to buy a couple of small radio modules,
connect the data out from the ptz controller to the data in pins on one
module, apply power,
and at the other end, data out to the data in on the cameras and power,
and have it work... with a little setting up i guess to set the baud
rate etc.

Search eBay for RS232 bluetooth?

e.g

Arduino Serial Bluetooth RF Transceiver Module RS232 SL
http://www.ebay.co.uk/250897860262

Mentions "Coupled Mode" halfway down the page, or ye can talk via
Bluetooth connected to a PC.

It's China, cheap but slow boat....

Or a UK based company

http://www.coolcomponents.co.uk/cata...h-c-25_63.html


(Disclaimer: No experience on using any of the above...)

--
Adrian C