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How long can it take for a COM port to become available on Windows?
How can I develop for iPhone using a Windows development machine?How can you find out which process is listening on a port on Windows?How do I install pip on Windows?Android 3.1+ USB as virtual COM portHow to forcibly free a COM port occupied by another application or has hungWMI query shows a single USB serial COM port?How to list com devices in Dos terminal?USB: Virtual COM port specificationScript for COM portsUnderlying hardware beneath virtual Com port
After a USB device is plugged in, it takes a while for the device to enumerate on Windows and mount as a COM (virtual serial) port. It seems it can takes 2 seconds or more when the device is plugged in directly, or 10 seconds or more if plugged in via a hub.
I currently retry every 2 seconds if I get back "file not found" when attempting to open the COM port, for a maximum of 8 attempts. This means that I retry for around 16 seconds before presenting an error message. However, I sometimes still see the error message in remote logging, meaning that on some machines devices take longer than 16 seconds before they can be opened via a COM port.
Is there any reasonable upper bound that I can use as a timeout?
windows serial-port usb
asked Mar 21 at 15:26
GerritGerrit
550514
add a comment |
After a USB device is plugged in, it takes a while for the device to enumerate on Windows and mount as a COM (virtual serial) port. It seems it can takes 2 seconds or more when the device is plugged in directly, or 10 seconds or more if plugged in via a hub.
I currently retry every 2 seconds if I get back "file not found" when attempting to open the COM port, for a maximum of 8 attempts. This means that I retry for around 16 seconds before presenting an error message. However, I sometimes still see the error message in remote logging, meaning that on some machines devices take longer than 16 seconds before they can be opened via a COM port.
Is there any reasonable upper bound that I can use as a timeout?
windows serial-port usb
asked Mar 21 at 15:26
GerritGerrit
550514
Do you have a UI? Can you put up some kind of progress dialog?
– Anders
Mar 21 at 16:14
Yes. Do you mean a popup like "Waiting for device.." with a Cancel button?
– Gerrit
Mar 21 at 16:47
Yes, something like that. If not, there might be some hardware arrival notifications you can use if this is some kind of unattended process.
– Anders
Mar 21 at 17:28
In this instance the user plugs in the device, presses an Upload button and expects it to work. Most of the time it does, but if it's the first time the device is plugged in it seems that it can take Windows a minute or more to install the drivers and get the device ready, and this is after the COM port number is available (but returns file not found if you actually try to open it).
– Gerrit
Mar 22 at 10:45
add a comment |
After a USB device is plugged in, it takes a while for the device to enumerate on Windows and mount as a COM (virtual serial) port. It seems it can takes 2 seconds or more when the device is plugged in directly, or 10 seconds or more if plugged in via a hub.
I currently retry every 2 seconds if I get back "file not found" when attempting to open the COM port, for a maximum of 8 attempts. This means that I retry for around 16 seconds before presenting an error message. However, I sometimes still see the error message in remote logging, meaning that on some machines devices take longer than 16 seconds before they can be opened via a COM port.
Is there any reasonable upper bound that I can use as a timeout?
windows serial-port usb
asked Mar 21 at 15:26
GerritGerrit
550514
After a USB device is plugged in, it takes a while for the device to enumerate on Windows and mount as a COM (virtual serial) port. It seems it can takes 2 seconds or more when the device is plugged in directly, or 10 seconds or more if plugged in via a hub.
I currently retry every 2 seconds if I get back "file not found" when attempting to open the COM port, for a maximum of 8 attempts. This means that I retry for around 16 seconds before presenting an error message. However, I sometimes still see the error message in remote logging, meaning that on some machines devices take longer than 16 seconds before they can be opened via a COM port.
Is there any reasonable upper bound that I can use as a timeout?
windows serial-port usb
windows serial-port usb
asked Mar 21 at 15:26
GerritGerrit
550514
asked Mar 21 at 15:26
GerritGerrit
550514
asked Mar 21 at 15:26
GerritGerrit
550514
asked Mar 21 at 15:26
GerritGerrit
550514
asked Mar 21 at 15:26
GerritGerrit
550514
550514
Do you have a UI? Can you put up some kind of progress dialog?
– Anders
Mar 21 at 16:14
Yes. Do you mean a popup like "Waiting for device.." with a Cancel button?
– Gerrit
Mar 21 at 16:47
Yes, something like that. If not, there might be some hardware arrival notifications you can use if this is some kind of unattended process.
– Anders
Mar 21 at 17:28
In this instance the user plugs in the device, presses an Upload button and expects it to work. Most of the time it does, but if it's the first time the device is plugged in it seems that it can take Windows a minute or more to install the drivers and get the device ready, and this is after the COM port number is available (but returns file not found if you actually try to open it).
– Gerrit
Mar 22 at 10:45
add a comment |
Do you have a UI? Can you put up some kind of progress dialog?
– Anders
Mar 21 at 16:14
Yes. Do you mean a popup like "Waiting for device.." with a Cancel button?
– Gerrit
Mar 21 at 16:47
Yes, something like that. If not, there might be some hardware arrival notifications you can use if this is some kind of unattended process.
– Anders
Mar 21 at 17:28
In this instance the user plugs in the device, presses an Upload button and expects it to work. Most of the time it does, but if it's the first time the device is plugged in it seems that it can take Windows a minute or more to install the drivers and get the device ready, and this is after the COM port number is available (but returns file not found if you actually try to open it).
– Gerrit
Mar 22 at 10:45
Do you have a UI? Can you put up some kind of progress dialog?
– Anders
Mar 21 at 16:14
Do you have a UI? Can you put up some kind of progress dialog?
– Anders
Mar 21 at 16:14
Yes. Do you mean a popup like "Waiting for device.." with a Cancel button?
– Gerrit
Mar 21 at 16:47
Yes. Do you mean a popup like "Waiting for device.." with a Cancel button?
– Gerrit
Mar 21 at 16:47
Yes, something like that. If not, there might be some hardware arrival notifications you can use if this is some kind of unattended process.
– Anders
Mar 21 at 17:28
Yes, something like that. If not, there might be some hardware arrival notifications you can use if this is some kind of unattended process.
– Anders
Mar 21 at 17:28
In this instance the user plugs in the device, presses an Upload button and expects it to work. Most of the time it does, but if it's the first time the device is plugged in it seems that it can take Windows a minute or more to install the drivers and get the device ready, and this is after the COM port number is available (but returns file not found if you actually try to open it).
– Gerrit
Mar 22 at 10:45
In this instance the user plugs in the device, presses an Upload button and expects it to work. Most of the time it does, but if it's the first time the device is plugged in it seems that it can take Windows a minute or more to install the drivers and get the device ready, and this is after the COM port number is available (but returns file not found if you actually try to open it).
– Gerrit
Mar 22 at 10:45
add a comment |
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Do you have a UI? Can you put up some kind of progress dialog?
– Anders
Mar 21 at 16:14
Yes. Do you mean a popup like "Waiting for device.." with a Cancel button?
– Gerrit
Mar 21 at 16:47
Yes, something like that. If not, there might be some hardware arrival notifications you can use if this is some kind of unattended process.
– Anders
Mar 21 at 17:28
In this instance the user plugs in the device, presses an Upload button and expects it to work. Most of the time it does, but if it's the first time the device is plugged in it seems that it can take Windows a minute or more to install the drivers and get the device ready, and this is after the COM port number is available (but returns file not found if you actually try to open it).
– Gerrit
Mar 22 at 10:45