COM ports
I know that when a device (serial or USB) is connected to a computer, the computer automatically assigns a COM port.
This assigned COM port never changes?
If so, when?
For example, is the same port when you
-Restart the computer?
-disconnect and reconnect the device
-change of USB port, you plug the device in
-etc.
Is there a way to check what devices are in what are COM ports programmatically?
I can manually look through the task or MAX Manager, but couldn't I do LabVIEW verify where the unit is?
Making the USB/RS-232 converters, it seems that when you plug in the device, the next available com port is assigned. As long as you continue to connect the unit to the same USB port, it keeps the same number of com. If you connect to a different USB port, it knows and give him as many COM next. So what I do is to put in place the drivers and plug the unit into one by one into each USB port in a logical order. That passing the com port is logical position rather than having COM3 in the com 4 back at the top right, com 5 forward, com 6 in the rear lower left corner because that was be the time of the order, I plugged it in different ports at random.
Then restart, disconnect reconnect, you get the same COM port. Change USB port, you get a different COM port.
I don't know ways to check a program, and I think you might find ways by searching the forums.
Tags: NI Software
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Cannot sync. -Com port in use error
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Then tried another HotSync and kept getting an error on the PDA "Cannot start the HotSync operation because the port is currently in use by another application"
Spent 2-3 hours to get here and other sites for possible solutions. Found none so tried to Soft Reset and then reset hot but neither worked. Finally I did a Hard Reset.
Was able to do a HotSync. It took 6:30, but it does not seem complete. Note that my memory is only half full
Now, the real problem. I wanted to see if I could do a HotSync and did not take hours to complete. But still, I get the port in use message.
The message comes even if the PDA is not connected to the PC by IR isn't something in the PDA. He was going to install dbFix, but since I can't synchronize I can't install it.
I note that after the Hard Reset did only 3 options under connections now, I have 6. There is an IR to a PC/handheld, but the details show that it uses really Cradel/cable. There is an infrared for GSM phone but I can not remove or change it. Also of IR to PC with a speed of 28.8 by default.
Solutions, ideas or even wild guess appreciated.
WyreNut
Thanks for the reply, but you are not the first to suggest not correctly the problem was in the PC.
I have finally resolved and am posting the investigation and the resolution here in the hope that others can solve the problems of strange synchronization they could find out by doing a similar detailed investigation.
The error message not being able to sync because the com port has been used pop up would immediately after recording HotSync. I without having to be connected or even close to a PC to get this error message. I have confirmed that being in front of PC with IR, equipped of Vista 32 bit, so it wasn't a problem with Win 7 64 bit either as I had been able to synchronize PC Win 7 approximately 4 weeks earlier.
I had 4 chat sessions with Palm TREES, where they provided a number of suggestions essentially to tell me that the problem was Win 7 based or 64 - bit based or that I did a Hard Reset if fixed (none of which were correct).
I tried a number of sweet, hot and hard resets. The only time wherever I could sync was after doing a Hard Reset and synchronization takes then 3.5 HOURS to complete. I could never do a second Hot Sync that I always get the error message.
I finally discovered that the list of connections is changing and the individual setting for one of the original connections was changed when I did the sync.
After a Hard Reset, there are three connection options:
PC Via cable/home station, Modem Via station home/cable and IR for PC/handheld Via infrared
When I ran the Hot Sync more than two connections have been added to the list
IR for GSM and GSM BUT phone serial
The surprise that took a few moments to discover that the PC/handheld Via IR computer had its details changed to home/IR obviously cable station, I could use this connection to synchronize this is to create a custom connection which was the PC Via IR.
The dropdown under HotSync would present the old PC/Pocket PC Via IR, but it does not work because he didn't was more IR I would choose the custom, but he made the mistake of com Port conflict
The SOLUTION was to delete all backup and archiving files, install the PC off, do a Hard Reset of the PDA and then do a HotSync.
This time sync took only 5 minutes, the connection list has not been changed and the settings in detail for PC/handheld Via IR were not changed.
I don't know when the commands of GSM phone has been added to the list of options on the PDA, I never used the PDA as a phone. I'm not even sure who's App adding the GSM phone files. He could have been there for years I never had problems with synchronization with USB port and a XP machine. Even the first synchronization IR on Win7 64 bit machine worked so I thought everything was OK.
Thanks for the suggestion anyway.
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Add more then 1 port
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MGK.Post edited by: mghouskhan
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Good bye
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