I've uploaded a new test package to the usual place: I really hope that this is the root cause, and not some arcane serial port communication issue. It turned out that due to poor choice of variable type, the current position of the telescope was always received as (0,0). An interesting question is if the letter-digits in the hexadecimal numbers in the parameters should be upper- or lower-case. ![]() The commands themselves ("R" and "E") should be upper case per the Ultima manual (the newer NexStar commands use lower-case). com/library/ celestron/ ultima2k_ man_0398. Just for reference, here is a link to the Ultima 2000 manual: My suggestion would be to find another Ultima 2000 user to run the same test. ![]() I was really hoping you could make my telescope work. I can see the TX and RX signals activated. I have verified that my COM1 serial port is working by doing a loop back echo check with a Communications program. I originally bought the DB-9 to phone jack connector from Celestron and I was able to control my Ultima 2000 previoulsy with an older version of ASCOM, and older laptop, running Microsoft XP operating system and Starry Night Pro. I ran all of the above tests with this brand new cable. I replaced the RJ-11 phone cord that runs from the DB-9 to phone jack connector to the Celestron Ultima 2000 Handheld controller. Of course my real telescope did nothing.ġ1. This time a circle with "Ultima 2000" slowly moved over the screen and "landed" onto the star I had selected. I selected a new star and pressed "Control 1". Next I configured the telescope interface to a virtual telescopeġ0. I stopped the Celestron Ultima 2000 (in Stellarium) and the TX light stayed green - the RTS and DTR lights became greenĩ. Selected a star to guide to then selected "Control 1" to activate the telescope - nothing happened - my telescope did not slewĨ. Configured Stellarium with Celestron Ultima 2000 scope and started the scope - TX light is green - RTS and DTR lights become redħ. Hooked up laptop running Stellarium using USB to RS-232 port (COM1) with an RS-232 breakout box to detect activityĦ. Tracked M-42 for 60 minutes - dead on - perfectĥ. Used Ultima 2000 Hand Control to "GO TO" several objects - all went to the correct locationĤ. ![]() Celestron Ultima 2000 mounted on an equatorial mount on a concrete pedeastalģ. ![]() I was just outside with my Celestron Ultima 2000 and tested your test code.ġ.
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