"In using the software GPUSPCheck v1.2.0, when checking the movement of the scope when the buttons RA+, RA-, DEC+ and DEC- are pressed, all movements work except RA+ which sends the mount in the same direction as the RA- button."
Craig,
Have you turned off Sidereal Rate tracking before trying the GPUSB check?
Try turning this off first and maybe try running the GPUSB check at various autoguide speed settings.
Also your RJ12 cable should be wired pin 1 to pin 1, pin 2 to pin 2, etc. Some cables are made with pin 6 wired to pin 1, pin 5 to pin 2, etc (ie reversed).
John
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