Writing to the paralell port

I'm trying to send bits out to the paralell port. from labview, can anyone help me how I can do this with labview?
thanks

Try this page:
http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596?opendocument
It has some good information regarding LV parallel port access.

Similar Messages

Programming the USB port with J2ME

Hi:
I searched for information on the Internet on this subject but found nothing good. I wonder if you can program the USB port on J2ME to write and read data.
If the answer is yes, someone has some simple example? I use NetBeans.
Thank you very much.
Frederick (Translated by Google)
Edited by: fede1976 on Jan 6, 2010 9:24 PM

Hi:
Thank you very much! I watched this document and apparently not very difficult.
My question now is more general: most current phones, regardless of the company that manufactures, allow reading and writing from the USB port from J2ME?
Thanks again.
Frederick (Translated by Google)

Writing a String to the Parallel Port

I am a new user of Labview and have very little experience. I am trying
to write an arbitrary string (that I can input) to the parallel port.
Basically, I need to communicate with a device that connects to it and
will accept commands as plain strings. I have read the article "using
the parallel port with labview" but it hasn't helped me as I am so
inexperienced. I was hoping that someone could help to learn how to do
this and if there's a vi that already does this. It seems like a simple
enough task. Thanks.

Rather than simply present an answer from which you will learn little, I will try and out line what it is that you should investigate......
First have a look at a string control
You might want a button and a case structure to tell the code when to start decoding the string
Put the following code inside the case structure say on the true state
Then, taking data from this string control get the strings length
Then using this and a loop index through the string using the string subset VI on the string pallette, use the length of 1 and index the position in the loop
Now figure out how to convert the character to an ASCII value
Send this to the parallel port
This should be a reasonable frame work to empower you to learn for yourself.
"Give a man a fish and you feed him for a day, teach a man to fish and you feed him for life", enjoy the free meals!
Message Edité par Conseils le 07-13-2006 09:17 PM

How can I use the output value from SIMPLE PID to write something to the serial port?

I am working on my Senior Design Project that requires the use of incoming compressed air, propotional valves, continuous servo motors, and a serial servo motor microcontroller. I have figured out how to send byte sequences to the microcontroller through LabVIEW using the VISA serial write function. The motors are attached to the valves to control the flow rate. I have created my own simple feedback system using a bunch of case structures but I realized that I am basically trying to recreate the wheel (I basically was writing my own PID VI). I have an older version of LabVIEW (7.0 Express) and theres no way to upgrade or buy the PID toolkit, so I am stuck using the Simple PID VI. Also, the only way the motor works is sending an array of bytes to tell it to turn on/off, direction, and speed. Is there any way I can use the Simple PID VI in conjunction with the VISA SERIAL write function, or is there any other way I can communicate with the serial port using this pid vi? Any information would be appreciated.

Hi gpatel,
you know how to communicate to serial port, but you don't know how to send a value from SimplePID to serial port???
You know how to communicate, but then you don't know how to communicate???
You should explain this in more detail...
Edit:
From you first post you know what values your motor driver is expecting. You know which values the PID.vi is providing. Now all you need is a formula to reshape the values from PID to the motor. It's up to you to make such a formula. Unless you provide any details we cannot give more precise answers...
Message Edited by GerdW on 02-28-2010 08:35 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Writing on the screen using a stylus is really poor

I have a Twist and I teach using this laptop. When I teach, I will often write on the laptop screen. For instance, in PowerPoint you can use the Pen functionality to write on the slides and the audience can see what you have written as you write. I have always used a Bamboo Tablet to do this. However, I assumed the Twist touchscreen would make the Bamboo tablet obsolete. However, the writing on the Twist touch screen is terrible... unless I am missing something.
When I write using the Bamboo tablet, I can get nice smooth letters. When I write using the touchscreen the letters get squared off. The touchscreen is unable to handle it. PLease see below. The red was written using a capacive stylus with the touchscreen. The stylus was a Jot Classic by Adonit. The blue was written using a tablet that plugs into the usb port. The tablet was a Bamboo Tablet and the stylus that cam with it. Do you see how the red letters tend to have a lot of straight lines while the blue is nice and smooth. Is this just a limitation with using the touch screen that I will have to live with? I have seen other claim they do note taking on the Twist. I can't believe that after my experience. What am I missing?

The Bamboo has a much higher sensitivity to pen input compared to the Twist. I think that what you are seeing is a result of the difference in the ability to detect the pen between the two. To make the Bamboo tablet obsolete, you would probably need to purchase an x230t, ThinkPad Tablet 2, or other product with a digitizer that supported a pen. The Twist is only really designed to be poked at with fingers.
You might have better luck with a larger capacitive stylus since the Jot classic has a very fine tip.
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How to access the serial port in Java?

How can I initialise and access the serial port for writing and reading data from it? Are there any code examples available?

I tried that and I tried compiling and executing one of its examples, the one below:
import java.io.*;
import java.util.*;
import javax.comm.*;
public class SimpleWrite {
static Enumeration portList;
static CommPortIdentifier portId;
static String messageString = "Hello, world!\n";
static SerialPort serialPort;
static OutputStream outputStream;
public static void main(String[] args) {
portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
if (portId.getName().equals("COM1")) {
//if (portId.getName().equals("/dev/term/a")) {
try {
serialPort = (SerialPort)
portId.open("SimpleWriteApp", 2000);
} catch (PortInUseException e) {}
try {
outputStream = serialPort.getOutputStream();
} catch (IOException e) {}
try {
serialPort.setSerialPortParams(9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {}
try {
outputStream.write(messageString.getBytes());
} catch (IOException e) {}
But when I execute this I get the error:
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleWrite
What is wrong with this example??

Problems with the USB Ports

Hi there,
I writing this because I'm having some really big problems with my USB ports.
A few days ago I plugged in an USB-Hub that was quite cheap. Suddenly a window popped up saying that a USB device was deactivated because it "needed" to much power. Since this happening, two of those windows keep popping up everytime I boot the MacBook. I called Apple and got some help: I had to delete some .plist files and clear some caches. The man who helped was able to find the error and deactivate the notification, he also told me to make a PRAM- and a SMC-reset. The man said that it's just a software problem and that I have to reinstall the system if we don't find a solution. So, one day later I reinstalled the system (Lion) and not only didn't it help, the two notification windows were popping up again...everytime I booted the Mac. So I decided to formate the whole hard drive and install Snow Leopard -> still the problem with the USB ports. After that I installed Lion -> still the problem with the USB ports. I even tried to extract the .kext files that are important for the USB functionality from an earlier Combo Update, but it didn't help either. The point is, that the Mac doesn't recognize my external hard drive or any of my iDevices. Sometimes it recognizes USB sticks, but only after 20 seconds. The data transfer on both USB ports is also very slow. If I'm lucky and Mac recognizes one of my USB sticks, it takes like an hour for 1GB to be transfered on the USB stick or from the USB sticks to the Mac.
I really don't know what to do and need help, especially because my backup data is on my external hard drive which I can't access because of this problem.
I really hope that someone can help me, I'm very thankful for every answer that could help me!
PS: Sorry for my bad English, I hope that everyone understands what I mean, please tell me if you don't get what I'm trying to explain in the text above.
Sincerely,
iLoud
[UPDATE] I downloaded "USB Prober" and copied the Output file, maybe it helps:
Timestamp Lvl            Message
    0.698 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7316), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.698 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.735 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.735 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.735 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.739 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.739 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.761 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7320), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.761 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.798 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.798 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.798 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.801 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.801 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.823 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7324), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.823 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.860 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.860 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.860 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.863 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.863 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.885 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7328), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.885 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.922 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.922 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.922 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.926 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.926 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.947 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7332), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.947 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.984 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.984 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.984 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.987 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.987 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    1.009 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7336), outstandingIO(0), _interruptReadPending(false) - rearming read
    1.009 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    1.045 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    1.045 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    1.045 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    1.049 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    1.049 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    1.071 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7340), outstandingIO(0), _interruptReadPending(false) - rearming read

Oh, sorry, I meant "I'm writing this...".

Using the In port.vi and Out port.vi in LabVIEW access my the Cards(Home made)

Hi Everyone,
I have got the Cards (home made 8 bit and 16 bit ) plug in at slot ISA my PC (I am using the commands inport and outport (addressed with 318-31A Hex) in C language to access very good).This now,I want to use LabVIEW language to access data directly to Port at my the Cards. In LabVIEW, Can I access data to port using the In port.vi and Out port.vi located in the Advance?
My English is poor, you don't laugh when you read it.
Thank you a lot.

SachaE wrote:
> LabVIEW 7.0 cannot use the built-in In/Out Port VIs with a 32-bit
> address. Instead, you will have to use the versions of these VIs found
> in previous versions of LabVIEW.
Are you talking about physical memory access here? If so that is
something entirely different. The Intel x86 architecture uses a separate
IO address range which is entirely separate from memory space.
And at least up to the first Pentium models it was definitely never
possible to address more than 16 bits for IO address space.
This of course has gotten a little more complicated nowadays with many
PCI boards being actually mapped into memory address space instead of IO
address space. So eventhough a PCI board is more like an IO device it
often is accessed in the memory space.
> Actually, the In Port and Out Port VIs are intended for 16-bit port
> I/O and not for writing to arbitrary addresses in memory. For this
> reason, writing to 32-bit addresses never should have been allowed.
I think the VIs to access physical memory addresses were different than
the ones to access IO addresses. And yes it is definitely not a good
idea to have an application poke into physical memory as it could
completely screw the system to the point where you couldn't start it
anymore. Also IO devices mapped into memory address space are almost
always typically plug and play devices, so their address is not really
fixed and you need to do quite some more work on OS level to enumerate
your hardware and find the resources used before trying to access it.
This is something not really suited to try to do in LabVIEW and
therefore should be at least implemented as DLL but in fact anything but
a device driver is a very bad kludge.
> One possible work-around would be to use NI-VISA to perform
> register-level programming. NI-VISA gives you access to any PXI/PCI
> board, not only NI boards, and can be used to access the board's
> registers.
>
> http://zone.ni.com/devzone/conceptd.nsf/webmain/ADF3152837E2B4A486256B5600642AC7?opendocument
Thanks for this. Didn't now this existed in NI-VISA. Will check it out.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Controlling pins on the parallel port

Hey
I'm writing a program in labview to controll a matrix card with labview. For that I'll use the parallel port. On the datasheet it says that only one off the pins shall send data serial into the card, and others are pins for update. clk etc.
So I need help on how to configure the parallel port to send different things to the dedicated pins.
jonas

Hi Jonas,
your task is a typical SPI - communication ( like it is used for many chips - A/D or D/A- converters; µC's etc. )
Find attached a SPI-example-program (LV7.1.1), ( 16 Bit in this case ) - there you will see the mechanism, how to
serialize Data @ LPT - Port and how a clock and /CS signals are added.
I think with all my comments inside the Diagram you should understand, how it works.
Switch the yellow light bulb "ON" and step through the program in Debug mode - every single clock and
Data change can be observed .............. or use a scope in "loop mode".
If there are still open questions - let me know.
Regards
Werner
P.S. Next time you should first simply type "parallel port" or "SPI" in search line.... on this forum you will
find a lot of threads about this issue........
Attachments:
project xx SPI.zip ‏92 KB

Writing to multiple DIO ports at once 6503

I have a PCI6503, a card with 24 DIO lines split between 3 ports, ports A, B and C.
I want to use the PortWrite.vi to write 12 bits at once: all 8 lines of port B, and 4 (lines 0-3) of port C. All 24 lines were configured for output using a single instance of PortConfig.vi (setting port =0, and port width = 24). Can I just send a line map to PortWrite.vi with 24 bits, indicating which lines I want written, ie:
[00000000][11111111][11110000]? I added brackets to emphasize the three different ports.
Of course I could just first configure each port, 1 at a time, then write the 8 bits of port B, and 4 bits of port C. That would be the "simple" solution, but I want the clean solution.
It would be really great if NI would act
ually document these sorts of things, so I don't have to ask them in a forum...
cheers all.

You should be able to configure the three ports in Traditional Nidaq or Nidaq6.9.3/earlier as one port, width 24, and then write a 24-bit word to the whole port using the port write function
In Nidaq Mx, you can use the syntax Dev0/Port0:2 assuming the device is Dev 0, when writing to the port

Writing to the System clipboard

This company uses LabVIEW 2012 and LabWindows 2010 in an Aerospace environment. The use of older versions is done to have commonality with their facilities across the globe. Thus, I cannot get them to upgrade.
On their new test station, they have 14 serial ports to communicate with the unit under test. I have developed a LabVIEW serial port interface program that will allow them to communicate with those serial ports. I have the ini file configured to allow the user to run multiple instances of the executable, for as many ports as they desire, during their testing. One option that they requested is the ability to right click the mouse, have a menu display to select copy or copy all of the data to the clipboard so that they can paste the received data into a test report. I used the LabVIEW App Invoke Node function Write to Clipboard and Read From Clipboard to perform the task. However, I have the issue that this works on some instances and does not work on other instances of the executables. Since the code is the same, the user enters which port to connect to, I do not understand why I have this issue. It works fine on my PC which only has a single COM port.
I decided to write two LabWindows functions to read and write to the clipboard using ClipboardGetText and ClipboardPutText. I call those dll functions from LabVIEW. The first call to the function ClipboardPutText works in the sense that the data is placed into the clipboard. However, I immediately get a fatal error and the process stops. (I did not save a screen image and the test stations are in use at this time). After that, none of the other instances will copy the data and they all result in a fatal error and stop. This is repeatable as I restarted the software numerous times as I tried to determine the cause.
Since I do not have access to the code for the clipboard functions, I cannot determine if I need to configure something else related to the clipboard or the process attempting to read/write from/to the clipboard. I will continue to search but wanted to ask the experts in control of the clipboard software to determine if they have any recommendations on what may need to be added.
For LabWindows, the only other call that I performed was a free command after I executed the ClipboardGetText, if the pointer to the text was not NULL.
I will post this in both the LabVIEW and LabWindows discussion boards in case one or the other has a solution.
Thank you for your help.
I can provide a zip file, containing the source code, to NI personnel if you provide an email address. Since I am a contractor, I am not sure if the company’s policy allows global posting of their code, although I may be able to reduce the code to a minimum example, if necessary.

I have done more testing in an attempt to clarify the error condition. I upgraded to LabVIEW 2014 on a Windows 7 SP1 system. I have enclosed some screen shots to show what I am doing.
My software allows multiple copies, 14 in this case, versions of the executable to run at one time. The software controls serial ports. The enclosed image of the front panel, LabVIEW window.png, indicates the COM port, baud rate, and version at the top of the window. This first small control allows the user to enter a command to send to the port. The large bottom indicator displays the data received on the port. I have menu items, pressing the right mouse button, that allows the user to clear all of the data, copy selected data, or copy all data. I have enclosed images of the copy, copy all, write to clipboard, and read serial port parts of the code. I was only copying small amounts of data, perhaps less than 256 bytes.
Here’s what I have noticed:
If I execute the code on my desktop computer, only 1 COM port, everything works fine. The copy and copy all will place the data into the system clipboard which allows the pasting of the data into Notepad.
If I execute the code on the test station, opening all 14 ports, we are using the NI serial card for all of the additional ports, the code works fine, as in item 1, for a couple of the executables but not the rest.
If I select a subset of the data being displayed, highlighted in blue by LabVIEW, then right click the mouse selecting the copy, the blue highlighting goes away but the data is copied to the clipboard allowing me to paste into Notepad.
If I right click the mouse selecting copy all, the data is NOT copied to the system clipboard so that I cannot paste it into Notepad.
In the Write to Clipboard function, I write to the clipboard and then read the clipboard. I added code to display, in a popup window, what was written to the clipboard and what was read from the clipboard. The data was the same although the data was not on the system clipboard so that I could paste it into Notepad.
I tried to select a subset of the data being displayed and then right clicking the mouse to do a copy all to see if that made a difference. It did not.
I tried to make the Write to Clipboard function re-entrant to test that theory. Not change in the behavior.
At one point, I tried to use LabWindows. I used the LabWindows clipboard calls and then tried calling the Microsoft clipboard functions directly. While those functions worked in LabWindows without a problem, I would get executable crashes when I tried to call my LabWindows functions from LabVIEW. If I commented out the actually code part, the call to the functions would return without crashing the executable. The issue was not in how the LabWindows functions were being called but something in the clipboard calls themselves. So, I decided that making a call using LabWindows offered nothing that I could use. I returned to using only LabVIEW and updated to 2014 to determine if that might solve the issue. No luck so far.I do not understand why, when I call the LabVIEW function to write to the clipboard, that it does not work for every executable of the multiple instances. Is there some other function that needs to be called prior to writing to the clipboard due to having multiple instances? Why does selecting a subset work when I do the copy but not when I copy all. If I am passing the data to write to the clipboard, why does selecting a subset and the copying only that subset work but the copy all does not? I do not understand how LabVIEW handles multiple instances and is they are truly considered separate processes.
I seldom use these forums as I can get most of the code that I write to work as expected. Thank you for all of your help and suggestions.
Attachments:
LabVIEW window.png ‏25 KB
Copy Menu Item.png ‏39 KB
Copy ALL Menu Item.png ‏33 KB

Sending an ESC code using the serial port

I have a motor control aplication that requires sending an ESC character using the serial port. LabView has several built-in functions (end of line, line return, etc.) but I just do not know how to send this particular code using the serial port. Any ideas?

The hex code for ESC character is 1b, Try writing it in a 8 bit unsigned number and then change that byte to charachter using labview function "byte Array to string". In this way you can pass this charachter.

Drivers for Creative WebCam II ( with paralell port ) for windows XP

Hi, I'm looking for the drivers for mi camera. It is a Creative WebCam II, that uses paralell port. I need drivers for Windows XP. I would be peased if you send it by email to: [email protected] a lot.

Windows XP doesn't support Parallel Port webcams, so I do not believe it is even possible to make such a driver. That webcam was also made back in 994-95...
Sorry.
Dale

How do I open the same ports on an Airport Extreme Base Station for multiple computers at the same time?

As the title suggests...
I have a mix of five Mac and PC's at home using an Airport Extreme Base Station as the router.   I need many ports opened on the AEBS for all of the computers- not just one computer. (for example: three people want to play TF2 on Steam at the same time; each machine needs the correct ports open on the router).   Port forwarding only allows me to forward a given port to a single IP, yet I need that port open for five differnt IP's, all at the same time.
How do I do that on an AEBS?
In the same way, I have a small office of four iMacs using an old airport with the same exact issue.   I would like to be able to connect to all of them remotely with Apple Remote Desktop, but the port forwarding on the airport only allows a port to forward to a single IP.   I want to be able to tunnel into the office network and log onto any machine behind the Airport extreme... not just a single IP.    I currently have it set up where I can tunnel into the office from my house, I can find the one machine that the port forwarding has been assigned to, I can log on and everything is just fine... with one machine.    How do I open the firewall for the other machines?
TL,DR version: How do you open ports on an Airport Extreme Base Station instead of forwarding ports?   Forwarding ports doesn't work for multiple IP's.

You can open a single or multiple ports to a single device or different ports to different devices, but you cannot open the same port to multiple devices via the AirPort Utility for the Apple routers.

When I am writing an email, I get an alert message that says "The message could not be copied or moved to the drafts folder. Writing to the folder failed. To ga

When I am writing an email, I get an alert message that says “The message could not be copied or moved to the drafts folder. Writing to the folder failed. To gain disc space, choose Empty Deleted and choose Compact Folders and try again.”
If I do that, I get a message saying “There was an error copying to the Sent folder,, retry?”
If I retry it sends the uncompleted email. All I can do is keep deleting the message and carry on. Then the whole business might repeat itself.
Help!
Frank

Because the location for each song in your library is on your hard drive. If the hard drive isn't there, how can iTunes play it?
You'll have to move/copy the music from your hard drive to your computer's hard drive.
Basically, EASIEST way to do all this, if you don't care about your play counts, etc...
-Delete EVERYTHING from iTunes, so that your library is now empty.
-Go to "Advanced" inside of the "Preferences" window, found in the "Edit" drop-down. You can also access Preferences by pressing Ctrl+, (Press Ctrl and the comma key)
-Change your iTunes Media Folder Location to something simple, but on your computer. I use C:/iTunes. Make sure "Keep iTunes Media Folder Organized" and "Copy files to...." are both checked. You can close Preferences now.
-Now, drag and drop your music from your hard drive into your iTunes library. iTunes will automatically add the music to your library, as you would expect, and also creates a copy of each file to place into that iTunes Media Folder you just created.
Shouldn't have any more problems...

Writing to the paralell port

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