John,
Get yourself a serial cable, cut one end off (the one that will connect to the mount) and work out which wires are required. I think the Celestron uerman details the wiring or the Nex star site has the details. For the connector, get on down to Jaycar or Dicksmith and buy a packet of connectors, forget which ones RJ?. To put it together, just use a something that can force the terminal down onto the wire. No special tools required.
Hope that helps.
Nico
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