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Gemini II battery replacement
OK, so I was advised to replace the battery on my Gemini II, and found the replacement instructions to be pretty scary.?
"Also After replacing the battery, Power on the Gemini-2 and set the time and date. Failure to do so could cause the processor to draw too much power from the battery and might result in processor damage." This looks to be a pretty old site, is there a better set of instructions for this?? Jamie |
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Re: TCP connection
开云体育The issue you encountered was probably not a ‘network’ issue per se. ?The reason for using UDP is because the Gemini has a more robust UDP stack as compared to its TCP stack (according to Rene). ?But this is not related to speed. UDP has less overhead … but at the expense of robustness/reliability. ?If, hypothetically, you could somehow have a network which is not capable of losing packets or having packets arrive out-of-order, then UDP would be a great choice. ?TCP was written to automatically manage these realities.? Something else to keep in mind (nothing to do with TCP or UDP) is that the twisted-pair ethernet cable is wired as a full-duplex cable. ?There is a wire pair for “transmit” and a separate wire pair for “receive”. ?A device doesn’t have to stop transmitting packets to “turn the connection around” to await response/acknowledgement packets. ?The speed of the network is vastly faster than the mechanical ability of the mount to respond — the network isn’t the bottleneck. I would use UDP with the mount… primarily because it is what Rene recommends based on the code running in the Gemini.? Clear Skies, Tim
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Re: motor cable
Just to confirm: My 492 cables at home are the Data type that George kindly just documented. Here are photos showing the wire colors are identical into both ends. Hope this helps... Michael On Thu, May 21, 2020, 10:53 AM George Cushing <pinyachta@...> wrote: Modular cables have some of the worst nomenclature on the planet. Yes, a straight thru cable is also reversed in that the plug at one end has its locking tab up the other has it down. The is the only way you can end up with the plugs looking like this. |
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Re: Company 7 Pole aligment issues and Com Port (RS 232) misbehaving
Hi Gustavo,
I think you are having an obvious issue here, the Losmandy polar scope gets threaded onto the RA clutch knob threads, the thread are most likely just hiding under the black square edged polar scope cap. ? Remove the black cap and thread the polar scope retainer onto the clutch knob. Be sure to use the wavy copper colored spring under the lip on the polar scope body and you should be GTG. Some of these mounts are not spaced correctly for use with the Polar scopes and may need some adjustment in the thrust bearing shim stack to keep the polar scope free to rotate even with the clutch knob snuged firmly. The ability to rotate the polar scope is required to use the polar scope correctly but you won't know it until you have assembled the polar scope and RA clutch knob. Try it and post a reply here.? The glass reticle needs to be replaced with an updated reticle design to be used as instructed in the instructions for polar alignment. It is not an absolute must, I used to cheat it but it gets old and the correct reticle markings makes PA a lot easier and more accurate if you are looking for solid PA for visual use and to make your initial GOTO's more reliable. For imaging use you will need to drift align or use a PoleMaster or SharpCap or something like it. Astro HuTech still shows the reticles on their site, here is the page: ? Click on it and put one in your cart to order one. It can sometimes take them a while to reply but they are really good people, and here in southern California we are still all but shutdown so be patient.? Unless you are a qualified electronics tech and have a hot-air rework station don't risk shotgun repairs to your Gemini 1, good Geminis are hard to come by and if you mess up the repair you will very likely need to buy a new Gemini controller. It is a LOT cheaper to have one of these qualified people do the repairs for you. If you need your Gemini system tested, diagnosed and if needed, repaired, Michael is the BEST at least here in the US of A - David and Brendan are the best on their respective continents and all are the nicest most dedicated and skilled Gemini component level repair people ON THE PLANET. That's no joke as when Rus passed away Losmandy lost the ability to repair these boards.? The best way to have fun as Michael suggests is to get your Gemini fixed by a qualified person or the only way you will be enjoying your Losmandy G11 is by buying a new Gemini.?? -- Chip Louie - Chief Daydreamer Imagination Hardware |
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Re: TCP connection
The issue you had definitely rhymes with mine -- has the same ending.?
I don't think that I want to throw a beta gemini firmware in the mix at this point I've got way too many variables. I had a great session taking images of the needle galaxy last night, without a single drunken slew! Next time it happens I'll try and get the log data. I'll cross post it to the ekos/indi site too, they're usually a big help.? Jamie? |
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Re: Company 7 Pole aligment issues and Com Port (RS 232) misbehaving
Hi Gustavo, If you have a Gemini1, and it's serial com port chip is damaged (of all rare G1 troubles, this is a more common one), I can usually fix that for you, if you are in the US.? If you are in the UK or Europe you'd want to contact David Partridge, or in Australia or Asia, contact Brendan Smith.?? But the serial port operation is also dependent on a good serial port cable, and these also sometimes go bad....only 3 wires and they can snap or corrode. So if interested in a repair, send the G1 and serial port cable so they can be evaluated.? My serial port cable is $25.?? As for the reticule in the polar scope being off (Polaris is moving and so is the Earth's axis...and it is noticable over a decade time), Chip Louie told me that the reticule from another polar scope can work. This was a few years ago.? ?Chip...please confirm my remembrance... and if possible tell where one can get a replacement reticule. (I was not clear if the polar scope just won't fit in the RA axis... as it once did... if so that's a question for Company 7!? ) The optical polar scopes and RA axis don't line up perfectly either.? At least not in any of my several brands of mount.? The polar scope reticule needs to be centered in the polar scope while it is in the RA axis, and this can be a difficult adjustment problem.? The reticules are fragile glass, and can be cracked by any overtightening of the very tiny setscrews used to center it.? You have to point the RA axis at a non-moving target (Polaris is pretty good for this if your scope and weights are very heavy).? Then rotate the RA axis to see if you can get the cross marker at the reticule center to stay stationary when RA rotates. If you escape this workout without a backache or eyestrain you are doing well.? This headache of adjusting the fragile reticule is another reason many folks have gone to video camera polar scope types.?? Have fun...contact me directly if you need a G1 repair. Best, Michael Sunnyvale, California On Thu, May 21, 2020, 8:55 AM Gustavo Pohls <gpohls@...> wrote: Good morning folks, |
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Re: TCP connection
On Wed, May 20, 2020 at 06:31 PM, Timothy Campbell wrote:
There is a speed advantage due to the Gemini UDP specification. It allows multiple commands to be packaged up together into a single packet and all the results and acknowledgements to be returned in a single packet. As an example, the ASCOM driver keeps a queue of all the requests and will send multiple ones in a single packet when backed up for any reason.? TCP/IP Gemini protocol is much more like the Gemini serial protocol and doesn't have the command coalescing behavior of the UDP protocol nor the acknowledgment for most commands that don't produce a response. In effect, it is less performant and less recoverable/reliable than UDP. |
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Re: TCP connection
开云体育SkySafari also has an option to enable logging. ?You can turn that on to capture logs and see if it provides you more info. ? ?Sky Safari retries commands several times before it gives up. ?You'll notice that in Sky Safari you can adjust the "readout rate" (how often it asks the mount to report it's RA & Dec position) and you can also adjust the timeout. The Gemini I is notoriously bad about responding to queries while it is still completing a slew. ?The Gemini II is better at this. ? But you might reduce the readout rate and increase the timeout values to see if those adjustments help.? Regarding TCP vs UDP... UDP is connectionless. ?It works a bit like a radio station in that it transmits packets but there is nothing inherent to UDP that guarantees that a packet (frame) was received on the other end. ?Any error detection/correction protocols would have to be implemented in the application. TCP is connection oriented. ?Once a connection is established, delivery is basically assured *or* you'll know about it -- because the ability to detect and retransmit missing packets is built into the protocol. ?The application doesn't need to worry about dealing with error detection & correction. Both TCP and UDP ride on top of the IP layer ... there is no discernible advantage with respect to things like speed, etc. ?using one over the other. That aside ... while it sounds like TCP would be the better choice, according to Rene, UDP is preferred in the case of the Gemini. ?Apparently more work was spent making sure UDP works and perhaps the TCP stack on the Gemini isn't as solid. Clear skies, Tim On May 20, 2020, at 5:43 PM, Brian Valente <bvalente@...> wrote:
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Re: TCP connection
Thanks Dean, I'll give that a try.?
In the meantime I found how to get horribly verbose logging to work:? indiserver -vvv indi_lx200gemini indi_asi_ccd indi_skysafari -- just for anyone who stumbles across this an wonders how to get verbose logging to work.? Output looks like this:? 2020-05-20T22:09:33: Client 11: sending msg copy 1 nq 2:
<setSwitchVector device="Losmandy Gemini" name="TELESCOPE_TRACK_STATE" state="Busy" timeout="0" timestamp="2020-05-20T22:09:33">
? ? <oneSwitch name="TRACK_ON">
On
? ? </oneSwitch>
? ? <oneSwitch name="TRACK_OFF">
Off
? ? </oneSwitch>
</setSwitchVector>
?
2020-05-20T22:09:33: Driver indi_asi_ccd: sending msg copy 3 nq 1:
<setNumberVector device="Losmandy Gemini" name="EQUATORIAL_EOD_COORD" state="Ok" timeout="60" timestamp="2020-05-20T22:09:33">
? ? <oneNumber name="RA">
9.0322222222222237065
? ? </oneNumber>
? ? <oneNumber name="DEC">
41.703611111111115406
? ? </oneNumber>
</setNumberVector>
?
2020-05-20T22:09:33: Client 0: sending msg copy 2 nq 1:
<setNumberVector device="Losmandy Gemini" name="EQUATORIAL_EOD_COORD" state="Ok" timeout="60" timestamp="2020-05-20T22:09:33">
? ? <oneNumber name="RA">
9.0322222222222237065
? ? </oneNumber>
? ? <oneNumber name="DEC">
41.703611111111115406
? ? </oneNumber>
</setNumberVector>
?
2020-05-20T22:09:33: Client 11: sending msg copy 1 nq 1:
<setNumberVector device="Losmandy Gemini" name="EQUATORIAL_EOD_COORD" state="Ok" timeout="60" timestamp="2020-05-20T22:09:33">
? ? <oneNumber name="RA">
9.0322222222222237065
? ? </oneNumber>
? ? <oneNumber name="DEC">
41.703611111111115406
? ? </oneNumber>
</setNumberVector>
?
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Jamie Amendolagine
Timothy Campbell
Michael Herman
Chip Louie
Paul Kanevsky