How to set a curve-offset in my diagram

Hi,
my VI gets values from an analog input in a loop, and draws these
values in my diagram (voltage values).
Now my curve will look like this:
y
|
| _--_
|______---- ----_______
|
|
|___________________x
Before my measurement starts, I have only a line with a certain
y-value (the "basic" voltage) :
y
|
|
|____________________
|
|
|____________________x
Now I want a button "Offset". When I click it, the current
value should be read and stored, and from then
subtracted from my values.
My curve should finally look like that:
y
|
|
|
|
| _--_
|_____----___----____x
My problem is, how can I read the current value (when I click my
button), and then store it as my "offset", to subtra
ct it from my
further values ?
Thanks in advance for your help !
Daniel

Just store the last value in a shift register, then subtract it from the new data for display.
See attached VI (LV5.1)
LabVIEW Champion . Do more with less code and in less time .
Attachments:
offset.vi ‏28 KB

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I want to reiterate that this works for our school but it should work for you as well. There may be better ways to do this but it works for us.
Hope this has been helpful and you won't have to spend weeks trying to figure this all out by yourself!

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OK...so now folks can get to your domain - but, remember, you have a private network IP scheme between them and you. You now have to tell your router that when web traffic arrives, allow it inside the network and direct it to your web server.
Let's say your public IP address is 205.100.112.50 and your web server is 192.168.0.5.
You have to create, in your router’s "Security Zone" (router companies call them different things) a couple of rules. Usually the first rule is: "Let everything inside the network get out to the web." You've probably already done that if folks inside the network can reach the internet.
You then have to tell the router to allow web traffic (port 80) into your network AND redirect that traffic to 192.168.0.5.
We use AdTran routers and they have a web interface which allows you to write "rules" affecting public and private traffic. Public is folks outside the network, private is folks inside.
AdTran calls them "Security Zones" and you modify those zones with policies.
So my "Policy" would say, in the above example, redirect traffic from my public IP (205.100.112.50) -> to my web server -> (192.168.0.5).
THEN you have to modify this policy with what AdTran calls "Traffic Selectors". You've said, OK, you can get in, but WHAT can get in?
The "Traffic Selector" is written to say: "Permit" "TCP" traffic from 205.100.112.50 only through Port 80. (That's the port that web traffic goes over. If you wanted a secure website, you'd add another traffic selector that opens port 443, for example.)
I'll tell you I'm no genius when it comes to this. I called AdTran and had them configure my router for me. I told them what I wanted done, they remoted into the router and configured it. But then I could go to the web interface and see what they did and then added rules later on when I wanted, for example, to get access to the network via Apple Remote Desktop or VPN into the network on my iPad.
I'd bet that your router has a maintenance agreement that includes this service and if it doesn't it should have.
I did find that I still had issues when I tried to set this up originally and it had to do with the ORDER of the policies. I can’t remember exactly what the issue was, but, effectively one of the policies highjacked traffic before the policy that I wanted got triggered. Simply moving them around in the list fixed that issue. So if you have this set up but still can’t access the site, check the order of your rules.
I don’t know if that helps or not, but I try to think about this stuff conceptually and then get someone to help me with the details. I work with this stuff so infrequently that I forgot how I did something 6 months or a year ago. I’m in the process of creating a wiki for the school which documents all this stuff, but that’s a major undertaking.
Cheers,
John

How to set Compatibility Mode for a single site in ie10

This question was originally posted on the Answers forum -
http://answers.microsoft.com/en-us/ie/forum/ie10-windows_7/how-to-set-compatibility-mode-for-a-single-site-in/187152e3-142a-4d96-8d1b-af82ef571eec
I am having problem with getting ie10 to set ie9 compatibility for a single site (sharepoint.contoso.com).
When I add this website in Compatibility View Settings (Alt > Tools > Compatibility View Settings > 'Add this Website') it adds the domain 'contoso.com' and not the individual website (sharepoint.contoso.com).
This cause other sites (www.contoso.com) to be configured to use compatibility mode. Because this is a separate site (different web server) to the site sharepoint.contoso.com (sharepoint 2010 server) we need different compatibility settings.
Using a different example to explain the issue -
Microsoft has three websites that are different websites created by different developers written in different programming languages and they only work with certain browsers.
microsoft.com (Website1 created by Developer1) - compatible with ie8/ie9/ie10
msdn.microsoft.com (Website2 created by Developer2) - compatible with ie8/ie9
technet.microsoft.com (Website3 website created by Developer3) - compatible only with ie10
The only thing the three website share is the URL contains 'microsoft.com'.
Marking 'msdn.microsoft.com' to run in compatibility mode affects the other 2 websites - mainly technet.microsoft.com which will not work now since it only runs in pure ie10 mode.
Should you be able to add an individual site to the compatibility list instead of all sites that have .microsoft.com in the URL? Am I missing a simple setting in the ie10?
As a workaround I am using the F12 Developer Tools to set the Browser Mode which temporary sets the compatibility mode. However this is not a nice solution to the end users at our organisation.

problem is not solved for non corporate environments...
You could start your own thread. Then if you got that answer and it was marked Answered you would have the ability to unmark it. The OP of this one seems satisfied. Also note that this is TechNet. Consumers can get help on Answers
forums.
Robert Aldwinckle
Oh! I wrote it wrong: I should have said: This is not solved for NON-AD environments. No demands what so ever to use Window 7/8 professional in a small corporation or on a big corporation with Island of smaller departments for example offshore.
The problem is that the thread is not "Answered" by the OP, its is marked answered by a moderator (and same moderator that did the answer) so no way of telling if the OP is satisfied.
But you are right in the fact that I am almost kidnapping the thread. But a complete answer would benefit all in this case I would presume.
Regards
/Aldus

Once and for all: How to set up and use SSH

Yes, I know ssh has been discussed on and off, but never in its entirety; and yes, there are step by step instructions on the www, but at one point or another they skip a crucial instruction that would be necessary for unix-dummies (e.g. how to save and close the nano-editor in Terminal). So, please pardon my question:
There are several points I'd like to ask for ssh-connecting two macs on a local network:
1) In terminal-file-"connect to server" you can ask for an ssh connection to be set up. For this to work, do I need to create private and public keys first? If so, how? Please point me to a reliable and step-by-step instruction site.
There are some free ssh-utilities out there, but their documentation is just not helpful enough for a UNIX-dummy.
2) Apparently I managed to connect via ssh once (from the terminal, see point 1) to a local server (allowing remote connection set to ON at the server). But then, when I connected to that server from the client's finder and tried to get into my user account on that server it told me that no secure connection could be established. What's wrong here? Do I have to continue working from within the terminal to use this connection? That would be difficult for an average MacUser.
3) What is the security advantage of an SSH connection on a local wireless network (Airport Base Station) over WPA2, if at all?
4) And how to set up an ssh-connection over the internet cloud to safely build a remote control/desktop sharing connection, e.g., a friend's Mac when she has a problem?
Thanks for your consideration.

First I'm not sure what your goals are.
1) In terminal-file-"connect to server" you can ask for an ssh connection to be set up. For this to work, do I need to create private and public keys first?
If you have ssh keys, you can do this without passwords. If you have not exchanged keys with the remote system, you will be asked for the password of the user you are attempting to login as.
If so, how? Please point me to a reliable and step-by-step instruction site. There are some free ssh-utilities out there, but their documentation is just not helpful enough for a UNIX-dummy.
Log into the remote system. This could be via ssh.
On the remote system, run the following command to generate an ssh key for that remote system:
ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/username/.ssh/id_rsa): <<take default>>
Created directory '/Users/username/.ssh'.
Enter passphrase (empty for no passphrase): <<enter nothing>>
Enter same passphrase again: <<enter nothing again>>
Your identification has been saved in /Users/username/.ssh/id_rsa.
Your public key has been saved in /Users/username/.ssh/id_rsa.pub.
The key fingerprint is:
aa:bb:cc:dd:ee:ff:gg:hh:ii:jj:kk:ll:mm:nn:oo:pp [email protected]
This will generate an ssh key for the remote system. This could be any system that support ssh, such as a Unix system, or another Mac.
Copy the id_rsa.pub file from the remote system to your Mac. When I say "your Mac" I mean the one that you want to make the ssh connection from. The id_rsa.pub is found in the remote system's ~username/.ssh/ directory.
Append the copied id_rsa.pub to your Mac's ~himbear/.ssh/authorized_keys2 file
cat id_rsa.pub >>~himbear/.ssh/authorized_keys2
Now when you ssh to that specific remote system, it will NOT ask for a password. The first time you ssh to any system, ssh will ask if the system is really the system you thing it is. But once you say "yes", it will not ask that question again.
Repeat for every remote system you wish to log into using an ssh key.
2) Apparently I managed to connect via ssh once (from the terminal, see point 1) to a local server (allowing remote connection set to ON at the server). But then, when I connected to that server from the client's finder and tried to get into my user account on that server it told me that no secure connection could be established. What's wrong here? Do I have to continue working from within the terminal to use this connection? That would be difficult for an average MacUser.
MacUser. A flash from the past, as in the MacUser magazine.
ssh is not used by default when you make connections. If you want an ssh connection, you have to establish it intentionally.
ssh can be used to pre-establish a tunnel (or tunnels) that other services can use. Once an ssh tunnel is establish, connections to local host's tunnel port will be connected to the specified remote port. For example:
ssh -L 5901:localhost:5900 [email protected]
will establish a tunnel that VNC can use. The VNC client would connect to localhost display 1 or port 5901.
ssh allows multiple -L tunnels to be specified on the ssh command line.
3) What is the security advantage of an SSH connection on a local wireless network (Airport Base Station) over WPA2, if at all?
Inside you home. Not much. Unless of course you do not trust the other members of your family. That is to say, others having your WPA2 password, and are thus on the inside, and can sniff you packets.
4) And how to set up an ssh-connection over the internet cloud to safely build a remote control/desktop sharing connection, e.g., a friend's Mac when she has a problem?
If you are using the Mac OS X Leopard built-in *Screen Sharing* and you are connecting to another Mac's built-in Leopard System Preferences -> Sharing -> Remote Management (Tiger's Apple Remote Desktop), then in the *Screen Sharing* preferences, is an "Encrypt all network data" option.
If you wish to set this option in advance, you can launch *Screen Sharing* by double clicking on System -> Library -> CoreServices -> Screen Sharing.app
You can *Screen Sharing* connections over the net using iChat. This is one of the easiest ways to take control of their system. Of course they need to cooperate. I use a Free AOL Instant Messager (AIM) account for my iChat connections. And as a side benefit you can text, audio chat and/or video chat with the person at the other end.
If you are NOT using the build-in Mac OS X *Screen Sharing* and/or you are NOT using the build-in remote Mac OS X remote management server, then this is a situation where an ssh tunnel would be a very good idea.
However, setting up an ssh tunnel between 2 systems across the internet gets complex.
In this case you might want to consider using something like LogMeIn.com which will deal with all those nasty home routers without needing to to do nasty router configurations, and it will be a secure connection. LogMeIn.com will not be as fast as a *Screen Sharing* connection or a VNC connection, but it will be secure and easy to establish. Again, this is only if you can not to Mac to Mac *Screen Sharing* using built-in Mac OS X remote desktop.
Now if you want to roll your own ssh tunnels for VNC, then I'm just going to outline the things you need to do.
If the remote system is behind a home router, you need to configure that remote home router to "Port Forward" port 22 on the Internet side to port 22 on the target Mac. Bonus points if the internet side using a high number port to discourge net bots from knocking on your door. Use the ssh -p 12345 option to connect to the high numbered port that is forwarded to port 22 of the destination Mac.
On the remote Mac you need to run a VNC server. If this is a Mac, then Leopard System Preferences -> Sharing -> Remote Management (Tiger's Apple Remote Desktop). If it is not a Mac, then for Windows, TightVNC, UltraVNC, RealVNC are possible options. Linux has a built-in vncserver, or you can install x11vnc which has the advantage of displaying the desktop screen.
Once you can access the remote system, you use an ssh command like the following:
ssh -p 12345 -L 5901:localhost:5900 remote.system.address
You can get the remote system's address by having the remote system surf over to http://whatismyip.com. Then they can tell you the IP address.
If you are going to be doing this a lot, you can get a free no-ip.com or dyndns.org dynamic DNS name for the remote system, and the remote system can run a dynamic DNS client (available from no-ip.com or dyndns.org) which will keep the dynamic DNS name updated as the remote person's ISP change's their IP address.
Finally, now that you have an ssh tunnel for VNC traffic, you have your VNC client connect to
Address: localhost
Port: 5901
Depending on your VNC client you may need to specify Display 1 instead of Port 5901. Or if you do not get a Display or Port option you specify localhost:5901

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