Thank you Ian, Jon and Tim,

All good answers.  When I heard something new to me, my mind says, "Hmmm. 
Wonder how that works or how that is hooked up."  I appreciate each input.
Jerry


----- Original Message ----- 
From: ian
To: psn-l@..............
Sent: Friday, January 04, 2008 2:28 PM
Subject: Re: Hekla volcano geophone planned


Hi,

to answer the question below, more than 1 data source per ip address,
here's 2 approaches (many more no doubt are possible):

tcp/ip sockets.  Using these, each ip address can be split into 65536
channels, or sockets, 0 to 65535.  Some of these are already allocated,
like 25 for mail and 80 for web browsing.  Anything above 1000 should be
available but check or be alert to something no longer working and try
another socket number.  These are also what those nasty hacker creatures
use for sneaking into unprotected pcs.

You could have 1 socket per sensor.  Under this regime you would need to
have a server program running in the pc for each socket.  It "listens"
for incoming connections.  When a connection request is made, it starts
serving up the stream of data for that particular sensor.

But rather than have 1 sensor on a single socket it is more sensible to
have many sensors on a single socket using a data protocol.  This is how
I have designed my system.  It sends out a continuous stream (50 samples
per second) of "(Lehman reading) (geophone reading) (time stamp)".  My
graphing program makes a connection to the "data server" and plots the
values from the 2 sensors as they arrive.  See http://www.iasmith.com.

As you'll see, my above-ground system is badly affected by wind.  I
recently achieved a big increase in sensitivity and was rewarded by the
now increased significance of the wind  :-( .  I need to dig down and
make a below-ground system.  Segway to the next topic...

Cheers

Ian



Jerry Payton wrote:
> Hmmmm  That's interesting, Jon.  I'd like to know more how you
> accomplish that without a different IP address for each geophone that
> you use.  You might contact me directly  gpayton880@.......
>   with an explanation and/or drawing when
> you have time.
> Regards,
> Jerry
>
>
> ----- Original Message -----
> *From:* Jón Frímann 
> *To:* psn-l@.............. 
> *Sent:* Friday, January 04, 2008 11:10 AM
> *Subject:* Re: Hekla volcano geophone planned
>
> Hi
>
> The geophone is going to be located at a house that is ~20 km away from
> Hekla volcano. But the connection from there to my main computer I am
> going to use the internet.
>
> Regards.
> -- 
> Jón Frímann
> http://www.jonfr.com
> http://earthquakes.jonfr.com
> http://www.net303.net
> http://www.mobile-coverage.com/
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@..............
>  with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

-- 


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)








Thank you Ian, Jon and Tim,
 
All good answers.  When I heard something new to me, my mind =
says,=20
"Hmmm. Wonder how that works or how that is hooked up."  I =
appreciate each=20
input.
Jerry
 
 
----- Original Message -----=20
From: ian 
To: psn-l@.............. 
Sent: Friday, January 04, 2008 2:28 PM
Subject: Re: Hekla volcano geophone planned

Hi,

to answer the question below, more than 1 data =
source=20
per ip address, 
here's 2 approaches (many more no doubt are=20
possible):

tcp/ip sockets.  Using these, each ip address can =
be=20
split into 65536 
channels, or sockets, 0 to 65535.  Some of =
these are=20
already allocated, 
like 25 for mail and 80 for web browsing.  =
Anything=20
above 1000 should be 
available but check or be alert to something no =
longer=20
working and try 
another socket number.  These are also what =
those nasty=20
hacker creatures 
use for sneaking into unprotected pcs. 

You =
could=20
have 1 socket per sensor.  Under this regime you would need to =

have a=20
server program running in the pc for each socket.  It "listens" =

for=20
incoming connections.  When a connection request is made, it starts =


serving up the stream of data for that particular sensor.

But =
rather=20
than have 1 sensor on a single socket it is more sensible to 
have =
many=20
sensors on a single socket using a data protocol.  This is how =

I have=20
designed my system.  It sends out a continuous stream (50 samples =

per=20
second) of "(Lehman reading) (geophone reading) (time stamp)".  My=20

graphing program makes a connection to the "data server" and plots =
the=20

values from the 2 sensors as they arrive.  See http://www.iasmith.com.

As =
you'll see,=20
my above-ground system is badly affected by wind.  I 
recently =
achieved=20
a big increase in sensitivity and was rewarded by the 
now increased=20
significance of the wind  :-( .  I need to dig down and =

make a=20
below-ground system.  Segway to the next=20
topic...

Cheers

Ian



Jerry Payton =
wrote:
>=20
Hmmmm  That's interesting, Jon.  I'd like to know more how you =


> accomplish that without a different IP address for each =
geophone that=20

> you use.  You might contact me directly  gpayton880@....... 
> =
<mailto:gpayton880@.......> =
; with an=20
explanation and/or drawing when 
> you have time.
> =
Regards,
>=20
Jerry
>  
>  
> ----- Original Message =
-----
>=20
*From:* J=F3n Fr=EDmann <mailto:jonfr@.........>
> =
*To:* psn-l@.............. <mailto:psn-l@..............><=
BR>>=20
*Sent:* Friday, January 04, 2008 11:10 AM
> *Subject:* Re: Hekla =
volcano=20
geophone planned
>
> Hi
>
> The geophone is =
going to be=20
located at a house that is ~20 km away from
> Hekla volcano. But =
the=20
connection from there to my main computer I am
> going to use the=20
internet.
>
> Regards.
> -- 
> J=F3n =
Fr=EDmann
> http://www.jonfr.com
> http://earthquakes.jonfr.com> http://www.net303.net
> http://www.mobile-coverage.com/<=
/A>
>
>=20
__________________________________________________________
>
>=
;=20
Public Seismic Network Mailing List (PSN-L)
>
> To leave =
this list=20
email PSN-L-REQUEST@...............
=20

> <mailto:PSN-L-REQUEST@SEISMIC=
NET.COM>=20
with
> the body of the message (first line only): =
unsubscribe
> See=20
http://www.seismicnet.co=
m/maillist.html=20
for more information.

-- 

<http://www.festivalpreviews.com<=
/A>>
__________________________________________________________
=

Public=20
Seismic Network Mailing List (PSN-L)

To leave this list email PSN-L-REQUEST@...............
 with=20

the body of the message (first line only): unsubscribe
See http://www.seismicnet.co=
m/maillist.html=20
for more information.