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David,
I'm not sure if you understood what the dontronics cable did so I thought I should clarify - it takes the place of the usb/serial and the EQDIR unit. All the electronics are contained within the USB plug. You simply plug one end into the USB port and the other end into the mount where the hand controller would normally plug in.
You can get the dontronics cable and change the plug on one end to suit your mount or get the already-modified unit from starstuff. This is a lot simpler than messing around with two adaptors in my opinion (and experience). I'd be surprised if the USB/serial+EQDIR option works out cheaper than buying the USB/serial TTL cable.
Peter
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