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INDI Library v1.9.6 Released (21 May 2022)

Bi-monthly INDI Library released with new drivers and bug fixes.

CEM40 usb drops connection

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Hi Ron,

I seem to recall some connection issues with the CEM40 which resolved after a firmware update. Just check that you are running the latest version of the mount firmware. Mine has not shown any connection issues since the update. I use a 7 port USB3 powered hub.
Hope this helps.

Mike
iOptron CEM40G, SharpStar CF90IIApo with Moonlight focuser, ASI294MCpro, ASI120MM-S, DIY MyFocuserPro2, RPi4 8Gb 120SSD running KStars/Ekos/Indi under Ubuntu Mate 21.04, DIY flat box
Skywatcher Flextube 12" Dob, Meade LX75 8SCT, Skywatcher NEQ6Pro

The following user(s) said Thank You: Ron DeBry
4 months 4 weeks ago #78790

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Will do. Not that 'update the firmware' doesn't strike terror into the hearts of many CEM40 owners...
I will check versions tomorrow when I have the mount back inside.
4 months 4 weeks ago #78792

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Ha Ha, you are right. First time I did it I thought I had bricked the mount as the connection dropped out half way through. However the last couple of times went without a hitch so hopefully this upgrading process is much more stable now. Fingers crossed :)
iOptron CEM40G, SharpStar CF90IIApo with Moonlight focuser, ASI294MCpro, ASI120MM-S, DIY MyFocuserPro2, RPi4 8Gb 120SSD running KStars/Ekos/Indi under Ubuntu Mate 21.04, DIY flat box
Skywatcher Flextube 12" Dob, Meade LX75 8SCT, Skywatcher NEQ6Pro

4 months 4 weeks ago #78793

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I have a GEM45 and was also having problems with dropping connections usually during a slew. I noticed that if I moved the USB cable it would sometimes loose connection. I narrowed it down to the USB B connection on the mount.
I made a modification to put a very secure 4 pin connector in parallel with the USB connector so I now have a totally stable connection. Since I was already busy I also replaced the power connecter with a solid 2 pin connector.


 
WO ZS 61
Esprit 100
Skyliner 200p
Edgehd 8 with Celestron OAG
Stellarmate on RPi 4
iOptron GEM45
294 mc pro
224 planetary cam
174 guide cam
Powerbox Ultimate
Sesto Senso focusser
Arduino focusser
QHY5II-Mono guide camera
EOS6D - not modified

Last edit: 4 months 3 weeks ago by Rishi Garrod.
4 months 3 weeks ago #78817
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The only firmware that was not up to date was the Main board. Updated that, Ekos still does not connect to the CEM40 directly from one of the pi usb2 ports.
I have had no dropped connections by going through the unpowered usb2 hub - yet (about 4 hours running simulators and 4 hours actual imaging). So it works, even if it requires a weird hack that I don't understand.
 
4 months 3 weeks ago #78867

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Replied by tda on topic CEM40 usb drops connection

I recently bought CEM 40 and facing the same issue with this error I pasted below. I am using astroberry (rpi4). I would really appreciate if someone can help with this problem.

Thanks
3 months 3 weeks ago #80027

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I just received CEM40 today. My rasberry pi4, too, does not recognize it. It says: [ERROR] Failed to connect to port (/dev/ttyUSB0). Error: Port failure Error: No such file or directory. Check if device is connected to this port.
Please help.

P.S. My firmware version is: 210605. I think it's the newest.
1 month 1 week ago #82254

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Use port selector and select a port from the dropdown list. Maybe baud rate 115200
Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info
1 month 1 week ago #82256

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What power source you power up raspberry pi4? Pi4 is power hunger. It may not have sufficient to power USB device plugged in. You can add a active USB hub in between Pi4 and CEM40.

Kenny
1 month 1 week ago #82259

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Replied by MH on topic CEM40 usb drops connection

This may not be the problem nor solution - I debugged this *endlessly* with my GEM45, and a powered hub didn't help (but I did spend money!).

See the culmination of my mostly-complete "saga" here .

The USB to RJ12 adapter however did *not* work, and the guiding issues were because I suck at polar alignment.

I did run into the "[ERROR] Failed to connect to port (/dev/ttyUSB0). Error: Port failure Error: No such file or directory. Check if device is connected to this port." problem as well - it was because the Pi couldn't assign it a USB adapter correctly, iirc because of the mount itself (was often the problem with the GEM45 when going direct-to-mount with the Pi).

You can see this on the Pi4 terminal by running:
dmesg -Tw

Then plug in the mount however you are doing this via USB - you can see what that will likely look like here if you are experiencing the same problem I was.

TL;DR: Grab a cheap, *unpowered* USB hub (I linked directly to the one I ended up using) and try that - it may save you a massive amount of headache / money-spending. You can see in my other post(s) that I ended up getting a different USB cable as well, but that did not work by itself (it required the unpowered USB hub).
Last edit: 1 month 1 week ago by MH. Reason: Code blocks, please don't be mean to me
1 month 1 week ago #82260

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I have selected every baud rate possible, but the problem persists.

Edit: this is a reply to Jasem Mutlaq
Last edit: 1 month 1 week ago by Ruth Arunin.
1 month 1 week ago #82262

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I used many types of power sources (home outlet and two power banks with different usb cables.) In addition, I tried an unpowered usb hub. Pi4 still cannot detect the mount. The mount works with Ioptron Commander 7.0 with my laptop with Windows10 fine.

Edit: this is a reply to KENNY WONG.
Last edit: 1 month 1 week ago by Ruth Arunin.
1 month 1 week ago #82263

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