How do I latch a momentary switch on mydaq

How do I get a momentary switch, connected to a digital input on myDAQ, to latch and drive a digital output?

Same answe as your other thread on this subject.
Please don't start multiple threads on the same subject.
Kelly Bersch
Certified LabVIEW Developer
Kudos are always welcome

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How can I open/close the switches of HP34903A independently via the subvi "HP34970A switch.vi"separated from "HP34970A GP Switch DEMO.vi" in HP34970A driver?

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I use this VI and have no problem independently opening and closing the relays. Check that the Close Exclusive input is set to "Normal". Also, are you sure that the Channel List input only has a single entry? Using your example, the first time you run it, the channel list should be 102,103 with Open/Close set to close. The second time, the channel list should be 103 and Open/Close set to open.

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Be sure to check that your Remoting Container service is running. If it is not, restart the service, and if it goes down again, check the event logs.
Make sure that the AuthenticationBridgeService is enabled in your EnvironmentSettings.config, and the remoting container user is configured using the SetupAssistant.
<RemotingContainer>
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How do I latch a sound in MainStage

I'm wondering how I can latch a sound in Mainstage. I've tried setting it as a sustain pedal but it isn't working the way I need it to. I'm trying to be able to hold a couple of notes out and then being able to turn it off.

Agreed, VARBINARY is the storage type you want. It should be used for anything beyond 8000 Byte and has a limit of 2 GiB.
If you don't want to oversize your tables, there is a half-alternative. The middle way between "Storing in DB" and "Storing on Disk":
SQL-Filestream
It works like a Varbinary Column for all intents of Security, Replication, Transactional integrity, backups and all the other stuff we use DB's for. But the actual contents are saved to the disk (thus the table stays rather small.
https://www.simple-talk.com/sql/learn-sql-server/an-introduction-to-sql-server-filestream/
Let's talk about MVVM: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b1a8bf14-4acd-4d77-9df8-bdb95b02dbe2

How to find Latch and what actions need to be taken when there is a latch

Hi
Can you please tell me how to find Latch and what actions need to be taken when there is a latch?
Thanks
Regards,
RJ.

1. What is a latch?
Latches are low level serialization mechanisms used to protect shared
data structures in the SGA. The implementation of latches is operating
system dependent, particularly in regard to whether a process will wait
for a latch and for how long.
A latch is a type of a lock that can be very quickly acquired and freed.
Latches are typically used to prevent more than one process from
executing the same piece of code at a given time. Associated with each
latch is a cleanup procedure that will be called if a process dies while
holding the latch. Latches have an associated level that is used to
prevent deadlocks. Once a process acquires a latch at a certain level it
cannot subsequently acquire a latch at a level that is equal to or less
than that level (unless it acquires it nowait).
2. Latches vs Enqueues
Enqueues are another type of locking mechanism used in Oracle.
An enqueue is a more sophisticated mechanism which permits several concurrent
processes to have varying degree of sharing of "known" resources. Any object
which can be concurrently used, can be protected with enqueues. A good example
is of locks on tables. We allow varying levels of sharing on tables e.g.
two processes can lock a table in share mode or in share update mode etc.
One difference is that the enqueue is obtained using an OS specific
locking mechanism. An enqueue allows the user to store a value in the lock,
i.e the mode in which we are requesting it. The OS lock manager keeps track
of the resources locked. If a process cannot be granted the lock because it
is incompatible with the mode requested and the lock is requested with wait,
the OS puts the requesting process on a wait queue which is serviced in FIFO.
Another difference between latches and enqueues is that
in latches there is no ordered queue of waiters like in enqueues. Latch
waiters may either use timers to wakeup and retry or spin (only in
multiprocessors). Since all waiters are concurrently retrying (depending on
the scheduler), anyone might get the latch and conceivably the first one to
try might be the last one to get.
3. When do we need to obtain a latch?
A process acquires a latch when working with a structure in the SGA
(System Global Area). It continues to hold the latch for the period
of time it works with the structure. The latch is dropped when the
process is finished with the structure. Each latch protects a different
set of data, identified by the name of the latch.
Oracle uses atomic instructions like "test and set" for operating on latches.
Processes waiting to execute a part of code for which a latch has
already been obtained by some other process will wait until the
latch is released. Examples are redo allocation latches, copy
latches, archive control latch etc. The basic idea is to block concurrent
access to shared data structures. Since the instructions to
set and free latches are atomic, the OS guarantees that only one process gets
it. Since it is only one instruction, it is quite fast. Latches are held
for short periods of time and provide a mechanism for cleanup in case
a holder dies abnormally while holding it. This cleaning is done using
the services of PMON.
4. Latches request modes?
Latches request can be made in two modes: "willing-to-wait" or "no wait". Normally,
latches will be requested in "willing-to-wait" mode. A request in "willing-to-wait" mode
will loop, wait, and request again until the latch is obtained. In "no wait" mode the process
request the latch. If one is not available, instead of waiting, another one is requested. Only
when all fail does the server process have to wait.
Examples of "willing-to-wait" latches are: shared pool and library cache latches
A example of "no wait" latches is the redo copy latch.
5. What causes latch contention?
If a required latch is busy, the process requesting it spins, tries again
and if still not available, spins again. The loop is repeated up to a maximum
number of times determined by the initialization parameter SPINCOUNT.
If after this entire loop, the latch is still not available, the process must yield
the CPU and go to sleep. Initially is sleeps for one centisecond. This time is
doubled in every subsequent sleep.
This causes a slowdown to occur and results in additional CPU usage,
until a latch is available. The CPU usage is a consequence of the
"spinning" of the process. "Spinning" means that the process continues to
look for the availability of the latch after certain intervals of time,
during which it sleeps.
6. How to identify contention for internal latches?
Relevant data dictionary views to query
V$LATCH
V$LATCHHOLDER
V$LATCHNAME
Each row in the V$LATCH table contains statistics for a different type
of latch. The columns of the table reflect activity for different types
of latch requests. The distinction between these types of requests is
whether the requesting process continues to request a latch if it
is unavailable:
willing-to-wait If the latch requested with a willing-to-wait
request is not available, the requesting process
waits a short time and requests the latch again.
The process continues waiting and requesting until
the latch is available.
no wait If the latch requested with an immediate request is
not available, the requesting process does not
wait, but continues processing.
V$LATCHNAME key information:
GETS Number of successful willing-to-wait requests for
a latch.
MISSES Number of times an initial willing-to-wait request
was unsuccessful.
SLEEPS Number of times a process waited a requested a latch
after an initial wiling-to-wait request.
IMMEDIATE_GETS Number of successful immediate requests for each latch.
IMMEDIATE_MISSES Number of unsuccessful immediate requests for each latch.
Calculating latch hit ratio
To get the Hit ratio for latches apply the following formula:
"willing-to-wait" Hit Ratio=(GETS-MISSES)/GETS
"no wait" Hit Ratio=(IMMEDIATE_GETS-IMMEDIATE_MISSES)/IMMEDIATE_GETS
This number should be close to 1. If not, tune according to the latch name
7. Useful SQL scripts to get latch information
** Display System-wide latch statistics.
column name format A32 truncate heading "LATCH NAME"
column pid heading "HOLDER PID"
select c.name,a.addr,a.gets,a.misses,a.sleeps,
a.immediate_gets,a.immediate_misses,b.pid
from v$latch a, v$latchholder b, v$latchname c
where a.addr = b.laddr(+)
and a.latch# = c.latch#
order by a.latch#;
** Given a latch address, find out the latch name.
column name format a64 heading 'Name'
select a.name from v$latchname a, v$latch b
where b.addr = '&addr'
and b.latch#=a.latch#;
** Display latch statistics by latch name.
column name format a32 heading 'LATCH NAME'
column pid heading 'HOLDER PID'
select c.name,a.addr,a.gets,a.misses,a.sleeps,
a.immediate_gets,a.immediate_misses,b.pid
from v$latch a, v$latchholder b, v$latchname c
where a.addr = b.laddr(+) and a.latch# = c.latch#
and c.name like '&latch_name%' order by a.latch#;
8. List of all the latches
Oracle versions might differ in the latch# assigned to the existing latches.
The following query will help you to identify all latches and the number assigned.
column name format a40 heading 'LATCH NAME'
select latch#, name from v$latchname;

How can i initialize a button (Switch when pressed) to be always disabled when i start the programm.

Hello
How can i initialize a button (Switch when pressed) to be always disabled when i start the programm. My problem is that the state of the button is always the state in which it finihed last time.
Thanks
Lukas

A button is either true or false. "Disabled" is a property that determines if the button can be operated or not.
It seems from the rest of your question that you actually want to ensure that it is set to false, but remain enabled. This is easiest done with a local variable as already mentioned by becktho.
If you want to disable the button, use a property node.
LabVIEW Champion . Do more with less code and in less time .

Where is the momentary switch

I am relatively new to this software but I've been able to find every component I've needed for the last year or so until today. I need a momentary switch. I'd prefer a SPDT but SPST would be fine for the simulation.
I'm using Multisim 12 since that definately makes a difference.
Thanks everyone and I'm sorry for the retarded question.

In Multisim...
Master Database -> Basic -> SWITCH     (PB_DPST)
...also...
Master Database -> Electro_Mechanical -> SUPPLEMENTARY_SWITCHES    (PB_NO, PB_NC, PB_DPST)
Some parts in the Electro_Mechanical group may only be available in the Multisim PowerPro edition...
Regards,
Pat N

How do I route multiple SB302 switches at different sites and their VLANs?

Hello Cisco Support Community,
First thank you for any replies.
The video posted today on 302's and multiple VLAN's on one switch was nice.
Thank you, I have that working but it's not really what I need.
Though pictures are worth a 1000 words so I hope someone will post something similar to my question.
I have 7 - SB 302-08 switches with the most recent firmware. (updated firmware today, thanks to the video, and TG for the CLI)
All 302's are configured for layer 3.
This is my first experience with the SMB line of switches.
I have a main office and several satellite branch offices.
All locations are connected back with a "Q to Q" circuit on individual ports to a vendor supplied switch at the main office.
I need to link all branch office 302 switches back to the main office 302 switch and allow traffic amongst them.
Mainly traffic between each branch office and the main office.
There maybe a future need to incorporate VoIP on them as well, but that is a back burner issue.
These locations will have an individual VLAN and 302 switch but need to receive data from the main VLAN and possibly others.
I have a "core" SB 302 setup at the main office with its own VLAN.
Each branch switch has its own VLAN.
I would also like to have a centralized management VLAN for the switches.
In trying to configure the core 302 I keep losing connectivity and having to reset it.
On the branch switches I end up getting them to only link to themselves with different IP's and not the core.
I'm assuming this is caused by my not configuring interconnectivity using ACL.
Please let me know if you need additional information.
Thanks

Alllan,
Well first you want to make sure you are running latest firmware 1.1.1.8 I do believe
Next either console into the switch or you can turn on SSH/Telnet under Web gui (Security••àTCP/UDP services and make sure SSH/Telent is enabled)
Now we configure the switch via Cli
We need to enter global configuration mode.
Configure Terminal
(next add our vlans)
Vlan database
Vlan 10
Vlan 20
Vlan 30
Exit
(you can run show command to see your vlans)
do show vlan
(Now configure the port how you would like)
Interface GE1
Switchport mode access (this is making Gigabit port 1 an access port)
Switchport access vlan 20 (this command is changing access port vlan from 1 to 20)
(less configure a trunk port)
Interface GE2
Switchport mode trunk (this makes port 2 for trunking)
(Now less add our Vlans)
Switchport trunk native vlan 1
Switchport trunk allowed vlan add 10,20,30
Exit global configuration
(Use this command to copy your settings to startup)
Copy running-config startup-config
(Some screen shots attached)
I see you have a WRT54G router which i don't think support vlans unless you have 3rd party OS installed.
So currently is the SG300 swtich operating in layer 2 or layer 3 , guessing this is why you choose to move up to 300 series switch?
If the switch is not in layer 3 mode but in layer2 when setting it to layer3 the switch will default all pervious settings.
If the switch is set in layer 3 mode you might have forgot your default route
(Command setting default route)
configure terminal
ip route 0.0.0.0 0.0.0.0 192.168.1.1 (192.168.1.1 being address of your WRT54G)
Now you would need to set up ACL's to deny and allow what traffic you wanted to filter on the SG300
Also reading your post we would need you to call into support center SBSC @ 1-866-606-1866
This way we could get a better idea of your current configuration and assist with fixing or finding a solution for you.
you have 1 year phone support with this product
Thanks,
Jasbryan

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Name: network.manage-offline-status
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Put the music you want to listen to into iTunes DJ or, play it from another playlist, or use another playlist to find the stuff you want to edit. Basically as long as you are viewing the source that is playing music then the focus will snap to the current item each time the track changes.
tt2

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*http://kb.mozillazine.org/about:config

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BordeauxQuill wrote:
If it is useful to anyone else, these are Western Digital My Passport Studio 640GB drives.
Yup, you're the 3rd or 4th to report it with various models of WDs (one fellow had 3 of them!), and a few weeks ago someone had some Iomegas, I think, too.
This confusion may well also explain some weird stats in Get Info I noticed last week (such as the drive apparently having used more bytes than its capacity, as I recall).
Quite likely.
Thank you for your support. I shall come back and mark the thread resolved when I have reformatted the drive.
Cool. Also double-check the contents of the one you don't erase; you may find some extra stuff there.

How to remap keyboard - Looking to switch the "fn" and "control" buttons?

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Thank you.

Firefox 4.0 has a combined Reload and Stop and Go button that appears at the right end of the location bar.
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#Press''' F10''' or '''Alt''' to see the menu bar
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Hi,
i have long text in my sap transaction, i am fetching using READ_TXT, it contains 5 lines like below
Which is the output length of one line of text in the program
for theobject list print Text length equal to exactly 132 characters.
Which isthe output length of one line of text in the program for the object list print
Text length equal to exactly 132 characters.Which isthe output length of one line of text i
n the program for the object list print Text length equal to exactly 132 characters.
my script output line length is 132 chars., now i need to print in script without cutting the words when switching to new line.
how to achieve this functionality.
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Srini

Hi Srinivas,
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Regards,
Pavan

How do I latch a momentary switch on mydaq

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