Hello passionate observers,
I got my hands on a Celestron Nexstar 11 GPS last spring. With the help of a few people from this forum, I have managed to clean the optics to near-perfection and collimate the instrument very well. Then came the time to have fun with it. Up to now, I have been using it without any automation. The Hand Controller, or something else, is really not in good shape. The display is somewhat loose and the cable connection to the back of the handle is quite loose, the rubber O ring is gone. Nevertheless, it lights up, most of the time, and displays the initial setup message. The automatic leveling starts and stops with the tube on a 2o deg vertical inclination. I go to the Level Calibration routine, saved it, restarted and leveling went wrong again. Then the display becomes corrupt and everything freezes. Automatic North alignment also fails after a complete turn. Motor Control seems to be following speed settings and pointing. But after 15 minuted of use, it too fails, Hand Controller display become garbled and everything freezes. In other terms, the Hand Control seems to be more or less « kaput ».
OK then, why not substitute for the NexRemote software? I downloaded it and tested it and it seems to be stable. Since I don’t thrust the scope Hand Controller I prefer to connect directly to the PC Interface Port Fork 8 conductor RS-232. I connect the cable to PC Serial Port DB9M.
This diagram :
I follow the [A] path on top.
I bought this cable. It should to the job :
But up to now, no success at getting the software talking to the scope. I tried all connection settings. I do have a few interrogations.
The Nexstar Hand Controller may be disconnected if I connect NexRemote directly to the Fork Port. If it’s defective, it SHOULD be disconnected, right? After all NexRemote, along with NexGPS, are supposed to replace it completely. So I disconnected the Hand Controller and got no improvement.
Could it be the that the cable I got does not connect correctly to the computer? I could have to swap individual wires to obtain the right connection. I only found the wiring diagram for the DB9 five pins connector of the Hand Controller. I could easily modify the RJ45 connection if I got my hands on the right diagram. Any hint?
I like manual operation of the instrument, but I’m missing A LOT without computer control.
Thanks for your help!