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Hi,
I do guide with the parallel port and before that direcslty through the RS232 port. No difference at all.
I have to admit that I have never guided trough USB but what should be better using USB ?
From my point of view ? Nothing.
Just to shot a few commands through a cable in order to get the mount moving faster or slower ?
By the way I use also the parallel port to control the shutter of my DSLR at the same time as I am guiding. No collisions at all. As Shoestring says it is a Pass through adapter and you just have to take care to use for other controlling software the free pins of the parallel port.
If you have a parlallel port use it and spare the USB port for other things.
Just my 2 cents
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