I need to read multiple counters using PCI 6601 can I do this, and How?
I am reading 4 TTL signals from a Magnetic Pickup how do I read multiple channels using PCI 6601?
Not concerning my primary question, I would like to point out to an N.I. Rep. that there is a typo in the help section concerning "posting a message".
I have built a large format, two axis digitizer using linear encoders, a 6601 counter/timer, and labview 8. In building my application program, I initially am using two daq assistants, with each set up to accomplish the task of reading two encoders simultaneously. In doing some research, It has come to my attention, that, with my current configuration, errors may result, due to one daq assistant attempting to access the cards driver while the other is acquiring data. All attempts to get two channels working through a single daq assistant have resulted in an error message informing me that I can only have one task per counter.Thus far, I have not seen any noticeable errors, thought I would like to have this device "rock solid", as it will be used extensively.
Is it possible, that I should have purchase an "S" series board instead?
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There are multiple ways of doing this. Here are some of them..
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How to switch multiple relays using PCI 6601 DAQ card
What is the specification of the digital output value given from the PCI 6601 DAQ card?How to develop LAB VIEW code to switch a relay?Can anybody please explain?
Hi hasi,
did you read the manual and the specs of the PCI6601? It says: "5V TTL/CMOS compatible"...
You shouldn't expect to much current from a simple DO pin - probably it's not enough to drive your relay!
Best regards,
GerdW
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6601 CTR/TMR - problem reading multiple counters
I'm developing some code for frequency measurement in Visual C++ using the
NI 6601 counter/timer board. I am able to successfully read the counter
for a single counter; however, my application requires reading multiple counters.
I have code to the effect as follows:
do
nStatus = GPCTR_Watch( nDevice, ulCounter1, ND_ARMED, &ulArmed1 );
nRetVal = NIDAQYield( nYieldOn );
} while ( ( ulArmed1 == ND_YES ) && ( nStatus == 0 ) );
do
nStatus = GPCTR_Watch( nDevice, ulCounter2, ND_ARMED, &ulArmed2 );
nRetVal = NIDAQYield( nYieldOn );
} while ( ( ulArmed2 == ND_YES ) && ( nStatus == 0 ) );
do
nStatus = GPCTR_Watch( nDevice, ulCounter3, ND_ARMED, &ulArmed3 );
nRet
Val = NIDAQYield( nYieldOn );
} while ( ( ulArmed3 == ND_YES ) && ( nStatus == 0 ) );
I have tried a single do..while, but to no avail. In the above code, the
first counter returns, but the next one just hangs there indefinately - not
arming.
Can anyone point me in the right direction on how to read multiple counters
on the 6601?
Thanks,
Aaron Lukacsko
[email protected]Your program is hanging because you are setup for a continuos read, which means your counter will never unarm. If the first counter never unarms, then your program will hang until the first counter is stopped. You need to either use one Do statement for all for of the GPCTR_Watches or use the Buffer Functions. If you want a continuos buffered operation then you need to use GPCTR_Config_Buffer and GPCTR_Read_Buffer functions. However, if you are just doing a finite number of counts then you use the GPCTR_Watch function, without any buffer functions.
Kevin Bisking
National Instruments
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Could I use PCI-6601 to generate a 200Hz clock based on a external 40kHz clock?
Could I use PCI-6601 to generate a 200Hz clock based on a external 40kHz clock?
That means I want to use PCI-6601 as a frequency divider. (40KHz->200Hz)
Is it possible? Is there any example I can refer to?1. Yes it's definitely possible to make such a frequency divider.
2. Here are a couple links that may help:
http://forums.ni.com/ni/board/message?board.id=40&message.id=3607&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=170&message.id=78359#M78359
http://forums.ni.com/ni/board/message?board.id=40&message.id=4232&requireLogin=False
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Hi,
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Try these in order - from best option on down...
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I have a mac book, with office for mac and iStudio installed. When I try to create a document using either one of these; after inserting several photos, the computer locks up and the only way I can get it to unlock is to do a force quit. Why does it do this, and how can I get it to unlock without having to do a force quit?
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You might start with:
Kappy's Personal Suggestions for OS X Maintenance
For disk repairs use Disk Utility. For situations DU cannot handle the best third-party utilities are: Disk Warrior; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.x is now Intel Mac compatible. TechTool Pro provides additional repair options including file repair and recovery, system diagnostics, and disk defragmentation. TechTool Pro 4.5.1 or higher are Intel Mac compatible; Drive Genius is similar to TechTool Pro in terms of the various repair services provided. Versions 1.5.1 or later are Intel Mac compatible.
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When you install any new system software or updates be sure to repair the hard drive and permissions beforehand. I also recommend booting into safe mode before doing system software updates.
Get an external Firewire drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
Backuplist
Carbon Copy Cloner
Data Backup
Deja Vu
iBackup
JaBack
Silver Keeper
MimMac
Retrospect
Super Flexible File Synchronizer
SuperDuper!
Synchronize Pro! X
SyncTwoFolders
Synk Pro
Synk Standard
Tri-Backup
Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore.
Additional suggestions will be found in Mac Maintenance Quick Assist.
Referenced software can be found at CNet Downloads or MacUpdate.
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