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Hi Peter
I think Dave's answer is where the problem lies. I have two 20 metre serial cables that can be used singly or joined together with a joiner and don't have any problem.
Are you trying to drive the scope in the native RS232 mode from the computer?
Are you using a USB to RS232 adapter?
Are you using ASCOM and EQMOD?
All these have different requirements when driven from a real com port or a virtual comport.
I don't think there is any problem with your cable if it works elswhere
Barry
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