View Full Version here: : PHD "Error 121...", WHAT??
21-10-2011, 11:15 PM
For months I have been guiding with PHD using a guidescope with a QHY5 camera attached.
I am using Windows 7, 64 bit and connecting the QHY5 camera to PHD via ASCOM 5.
I have not had a problem until tonight. All of a sudden I am getting an error message "...failed with error 121:the semaphore timeout period has expired...".
PHD locks up, the message keeps appearing and I have to switch the laptop off to stop it.
I am completely stumped!
Does anyone have any ideas?
22-10-2011, 12:38 AM
Must be a "disease" afflicting only PHD + QHY5 - mine starting giving me errors every now and then - worked like a charm before with W7 64bit, ASCOM6 - now I've got to reboot in order for the camera to be recognised again !!!??!!!???
22-10-2011, 06:31 PM
Are you getting the "...error 121..." message?
I thought it was a PHD error, but after some searching on the internet today, I think it might be a more general Windows7 error.
Still a mystery though as I have not changed anything on the laptop.
22-10-2011, 07:13 PM
This is curious. I have a new lappy with win764bit. I have tried to install my QHY guider on it. The guider works well on my old puter running XP with the old non ascom driver.
I have ascom 6 on the new puter. I installed the drivers for the guider along with the ascom driver. It seem to recognize the guider but if I try to take an image with either PHD or CCDsoft I get the same loop as you describe. I has to be killed using task manager.
I assumed I had a driver issue with the QHY5. I think more info is needed.
22-10-2011, 07:54 PM
It is a clear night tonight so I am going to test everything again.
23-10-2011, 03:27 AM
No Ross - not the same error message - I suddenly had "failures" in the comms between the OS (Win7 64bit) and the two cameras; QHY5 & CCD OSC so the last few nights when it was cloudy I've been toiling away trying to nut out why things are going southwards out of the blue!!
To start off with I had a great struggle getting the QHY5 to go on right with W764b and also ASCOM 6 when installing had blurted an error message about missing something (I believe 'twas something to do with .net or other - I ignored it and ASCOM 6 continued happily to finish installation) but thereafter for more than 6 months everything worked fine; even with my ASCOM-driven Sidereal Technology scope driver for my G11 and with EQMod for the EQ6 Pro - BUT NOT ANYMORE since a few nights ago!!:mad2:
I'm planning to can the harddisk and re-install everything from scratch again
23-10-2011, 12:11 PM
I would also check out the QHY5 itself. Plenty of reports of frimware getting corrupt on these and needing a reflash when USb driver issue start showing up.
23-10-2011, 03:34 PM
Perhaps, but most unlikely because the QHY5 & CCD OSC cameras still work fine on my older XP SP3 pc with no issues last night when I did a dry run "looking into a pea-soup looking sky" (before the rain!!) - most likely something in W7 (after many "free high-priority" updates from M$oft) has caused this I believe; as the comms are being handled at the underlying low-level stage of the OS ie the "drivers" - so methinks a clean install of W7 is in order
24-10-2011, 09:48 PM
The error message happened on Friday night. I searched the internet and ended up in computer programming forums where I was way out of my depth.
I did understand though that the error was a Windows 7 one, not a specific PHD error message. I thought the problem might involve the fact that 2 different cameras are downloading images on the same USB port so I uninstalled the computers USB drivers and then let the computer re-install them. This procedure has solved "strange" computer problems in the past.
Saturday night was clear so I set up again in my back yard.
I felt like a genius....everything worked perfectly all night. Not a single error message or hiccup. I went to bed happy.
Sunday night I set up again and the error message was back within 15 minutes of starting.
I didn't panic. I was able to close PHD without switching off the computer. I plugged the QHY5 into a usb port on the opposite side of the laptop to where the imaging camera was plugged in.
Everything worked perfectly for over an hour and then the message was back. It was not as severe this time. I was able to click cancel twice on the message and it then disappeared.
Everything then worked perfectly again until I packed up at midnight.
The random nature of this error has me worried. I am lucky to get 4 good imaging sessions a year so if this had happened away at Coonabarabran I would have been in big trouble.
I could wipe the laptop and re-install everything, but there would always be doubts.
Do I need to take a spare laptop with me when I go away?
I am continuing my search.
25-10-2011, 03:23 AM
Ross - if you've got "good" results by separating the use of the USB ports then it must be the power issues of the USB ports; ie they are not generating enough "oomph" to drive the two devices simultaneously if you used the side-by-side ones - also in Windows 7 you should actually turn off the "power-saving" mode for the USB ports too as I've come across this subject being talked about in some other forums recently - if I can find the article I'll post the link here
25-10-2011, 04:55 AM
Thanks, that is a good suggestion and something I had not considered.
Trying to remember back I think I did have the laptop on battery power for the start of the night andn then used the ac adapter later on.
I will do some investigating. I'll let you know.
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