Also, the only thumb screw on the EQDir RS connector snapped and I’m reliant on friction to stop the plug falling out. The actual amount of voltage and current is not so important. Should of read the post a bit closer. Do check with a multimeter before hand to make sure you have the 12v lines correctly identified. Shoestring Astronomy has always been an “evening and weekend” enterprise because of the demands of my full-time employment. Posted January 12,

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Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Be sure to disconnect the power once this event happens or if you notice any unusual sound coming from the motor assembly. Top And fitted back in the case: Dave, did you cut open the converter or does it bolt together?

The Shoestring Astronomy Store – EQ Direct Interface Products

Although these devices still run on 5v though they can run on higher voltages the locic levels are 0v and 5v with the average switching level around 2. Circuit modifications implemented on your setup could invalidate any warranty that you may have.

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. As I recall the average actual switching level was about 1.


Recommended mod to bring the signal output up to 5v Either of these circuits will do, to help with noise immunity and longer cable lengths. Thanks for the post. Do check with a multimeter before hand to make sure you have the 12v lines correctly identified.


The PIC will most likely take anything over over 2V as being a “high” signal and anything lower than 0. Posted January 12, edited. 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.

Posted January 11, edited. Another way to help with any noise issues is to shorten the cable, and extend if needed on the USB side.

XAGYL Astronomy :: Cables

Here’s the datasheet if you want more details: Important Information By using this site, you agree to our Terms of Use. I was aiming for a neat all-USB approach for my setup. This is not true for TTL levels.

If you need more than 5 metres then probably best to stick with the RS version. Posted January 11, So is the Tx output to the mount just 3. Share this post Link to post Share on other sites. Serial port extension cables are wired straight through, that is pin 1 to pin 1, pin 2 to pin 2, etc. 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.

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. DAve, firstly, nice to see you posting againfeels like you’ve not been around ,here or UKAI for a while and secondly, -superb and just what I was thinking about getting. 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.


CMOS logic levels are 0v and Vcc the supply voltage with half that as the switching level generally. The transceiver modules themselves are 3. You need to be a member in order to leave a comment. I’m in need of making a new canon shutter release, and this might fit the bill.

I don’t wish to start adding transistors isb owt else to it once it arrives cos I don’t know what I’m doing- it needs to be a “dummies” version for some of us. The 2N is a TO part so should fit in the case snugly, and the two unconnected pads along the bottom next to Tx are 3.

All the outputs from the converter will be at 3. The “problem is that in lowering your max level down to 3.