Re: ASCOM Serial Connection Errors #ASCOM

Dan Kahraman

Hi Jerry:

You have thrown a few question that I can answer and one that I can't:

For the ones I cannot answer:
COM3 shows up immediately under COM Port but I also get the error message "Mount does not appear to be connected"

The DB9 to USB cable is FTDI enabled, written on the plug. I installed the ??

Dan Kahraman

On Fri, 13 Sep 2019 at 09:33, Jerry Hubbell - Explore Scientific VP Engineering <jrh@...> wrote:
On Fri, Sep 13, 2019 at 09:29 AM, Dan Kahraman wrote:
I am getting the same message. When I did an ASCOM diagnostics I get the error message access to COM port 3 is denied. Doesn't say why. But now I know why there is no connection. I don't understand why the commands sent via the serial port are being received.

I notice the baud rate is greyed out. I think going into properties of the device and setting the baud rate to the right amount (112,500) may resolve that problem.

Dan Kahraman
Hi Dan,

When you open up the Device Manager, do you see Com Port 3? If you do see the com port, there is no need to set the baud rate in the USB com port settings as the program sets the baud rate correctly. Also how do you know the commands sent to the serial port are being received? Are you using a DB9 Serial to USB adapter that uses an FTDI chip set?
Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at
1010 S. 48th Street
Springdale, AR 72762

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home

Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!

Join to automatically receive all group messages.