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Hi Trevor
The LX200 and LXD 75 have different controllers. The LX90 and LXD 75 use the "universal" 497 controller that can connect as already explained to a PC that has any PC planetarium program that uses the Meade protocol for communication.
The LX200 (GPS) has the AutostarII hand box controlling the drive computer in the mount. However the external control via the RS232 connector uses the same Meade protocol although there are some extra functions available. As said before the computer control is only available after the telescope has been aligned from its mating controller and this must be still connected.
Barry
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