I have been following this thread for some time. I currently connect to my AVX via that hand controller but going forward I would like to connect my Raspberry Pi directly to my mount via the AUX port and to start using this driver.
However I am struggling to undestand how to do this. Is there a pre-built USB -- RJ12 cable that can be purchased from somewhere?
Or can I use a USB FTDI TTL 5V cable and connecting the correct pins to the RJ12 plug and make it work?
I'd like to do the second option but as far as I can tell from reading numerous sources on the web, this cannot be done.
Celestron's AUX terminal (same as the hand controller connection terminal) cannot be connected with UART serial like SkyWatcher's mount.
The TTL level of the signal line is 3.3V, but it is necessary to switch the signal line electrically instead of a simple TX or RX connection.
I was able to assemble and operate the circuit on this site.
However, the Celestron Aux driver only has the coordinates of the altazimuth mount and the fork equatorial mount, so German equatorial mounts like the Advanced-VX will move to different positions. .. ..
If you use SkyPotal, you can control it directly without a hand controller.
I have compiled the information you need to create your own interface.
Please check with Google Translate etc.
If you use this circuit, you can connect the Celestron mount directly to the USB of the PC from the AUX terminal or HC terminal like EQMOD.(However, the German Equatorial Mount works because the driver does not have the correct coordinates, but it moves to a considerably different position with GOTO.)
I created a WIFI module and an AUX → USB module, but they are working so I can check if the driver update.
Currently, I have confirmed the two problems mentioned in the requested topic.
1. The driver does not connect with AUX → USB connection.
2. Since the coordinates of the equatorial mount are only fork type and there is no coordinate of the German equatorial mount, the coordinates will shift by 6 hours when GOTO with the German equatorial mount.
I built a cable according to these instructions www.nexstarsite.com/PCControl/RS232Cable.htm
I plugged it into the PC port if my CPC800.
I was not able to connect using this driver because gpsd claimed it so I disabled gpsd.
Now I can connect but beyond that I cannot figure out what is going on. The mount moves to all sorts of weird places. The cord wrap seems to be ignored. I am in the southern hemisphere.
I built a cable according to the instructions on the celestron website
I plugged it into the PC port if my CPC800.
I was not able to connect using this driver because gpsd claimed it so I disabled gpsd.
Now I can connect but beyond that I cannot figure out what is going on. The mount moves to all sorts of weird places. The cord wrap seems to be ignored. I am in the southern hemisphere.