You need to be a member in order to leave a comment. Another way to help with any noise issues is to shorten the cable, and extend if needed on the USB side. Or sign in with one of these services Sign in with Facebook. I will do my best to fill orders and respond to emails in a timely manner, but please realize that there may be times when I cannot respond as quickly as I would like to. I haven’t looked at the chip involved but I’m guessing that the chip takes 5v in from the usb, then has an onboard regulator for 3.

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The source of power comes from pins 1 and 8 of the mount’s DB9 connector.

Be sure to disconnect the power once this event happens or if you notice any unusual sound coming from the motor assembly. Also, the only thumb screw on the EQDir RS connector eqrirect and I’m reliant on friction to stop the plug falling out. To clarify, the chip in the converter is a 3. Requires Adobe Acrobat Reader.

XAGYL Astronomy :: Cables

Posted January 11, Eqdirext 5 and 4 are ground pins. Important Information By using this site, you agree to our Terms of Use. Make sure that you perform the modifications and testing while there is no physical “load” or dangling wires on your mount.


So is the Tx output to the mount just 3.

This said the unit I tested and shown above works flawlessly without needing these additions even though I can’t explain why! Connect the two cables as follows: One other option is to crimp an RJ plug on the end of the cable and secure with a small amount of glue CMOS logic levels are 0v and Edqirect the supply voltage with half that as the switching level generally.

Hi Dave, Nice find and nice to see you back posting.

USB EQDir for under £4 – DIY Astronomer – Stargazers Lounge

eqdirdct The good news about splitting the case means that wit care it might be possible to fit one or two additional components in the case. So you can’t afford to lose a lot. During this time we will be unable to ship orders, and will have no access to internet to answer emails, or provide technical support. Edited January 12, by 12dstring. I have tried both 3V and 5V types and can say that the with 10m of cable at the RJ45 mount end the 3V didn’t work but the 5V did.

Thanks for clearing that up dave, I wasn’t sure if it was a eqdurect 3.

Register a new account. Nice find Dave, I was looking at some usb to serial boards on ebay ego china ebay shop for a similar purpose, yours are a bit cheaper than those.


I like to run CMOS logic at 12v to give greater noise margins but if these mounts use 5v supply then you’re stuck with a lower noise margin and using 3.

Not all DB-9 cables are created equal. If the voltage drops below the safe high level of the receiving device, communication becomes unstable. The 2N is a TO part so should fit in the case snugly, and the two unconnected eqdirdct along the bottom next to Tx are 3. Sign In Sign Up.


Not sure if that applies to these new TTL levels, but if it similar, then extending the cable on the serial side may be better than on the USB side. Sign in with Twitter. If your connector wiring colours are exactly the same as in these pictures, then the connections are as follows:. I was aiming for a neat all-USB approach for my setup.

I originally planned to have a little 3. Use this information at your own risk. You need to be a member in order to leave a comment. Sign up for a new account in our community.