Smidsy
that HC is basically a set of switches that as low you to move the mount Ra & DEC directions at what ever rate had been set. It plugs into the top left ¡°Hand Control¡± port via a 6 pin RJ Jack. ?
The main HC (with display) plugs into the side DB15 serial port. ?Some people like to have and the extra ¡°dumb HC¡±. ? You kinda get used to the buttons like the main HC.
Anyway you need a straight through 6 pin RJ 11 (or RJ12 depends upon hour country) to connect this. It¡¯s not necessary but some users like it. ?You can make your own cable if you buy an RJ crumpet, 6 core flat cable and RJ plugs, easily. Or you can probably buy one.
The pin config is the same as the except on the Gemini 1 the 3.3V is 5V. ?As long as it¡¯s wired straight thru it¡¯s ok. ?The 5V is just for LED .
There used to be layout pics of it all in the files section. ?Cannot find it atm. I can send drawings etc if you want
Cheers
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Brendan