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Thanks Dean and Andrew for your responses, sincerely appreciated.
I have checked the new Scope Stuff LX200 data cable and pins 2,3 & 5 are wired correctly to the RJ12 plug (exactly same as the existing cable that runs and works perfectly on the observatory scope). The pc & telescope are connected via a Keyspan serial adapter.
I am assuming the new cable has some other issue internally that causes the error message as it gives the same error message when connected to either scope.
You have answered what I was unsure about - whether I needed a shielded cable at 5 metres. So tonight I will make up a 5m cable using 4 core telephone wire and all should be well. Will discard the cable that doesn't work and let you know how the new cable works.
Thanks again,
Peter
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