You can either have mount guiding corrections sent directly to the mount (via the ST4 port) which means that you do not actually need to be connected to the mount. You can also connect to both and forego the ST4 cable and have guiding corrections sent via the computer to the mount.
If I am using PHD2 I tend to use the ST4 port myself as I find it tends to play nicer personally. May have something to do with several programs wanting to talk to EQMOD at the same time. Whatever works I guess. If I am guiding in MaximDL I'll just have it all go through the mount and not bother about the extra cable. If using TheSkyX I think it much prefers to use the ST4 cable.
Not entirely sure how it all talks to BYNikon, it's on my To Buy list but not too high up there at the moment.
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