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Hi Sophie
My Notebook computer does not have a “native” RS232 connector, so I purchased a PCMCIA card that plugs into the card slot at the side of my Laptop and provides an RS232 (9 pin) connector on a dongle and this has always worked for me.
I had to configure the port for my Takahashi EM200 Mount per the attached file, but please note that this is specific to the Tak Temma mount and yours will be different.
I know that people on Ice In Space have had success with some USB to RS232 adapters, whereas other adapters have failed. I’m not sure which the good ones are – hopefully someone will chime in and name a particular brand/model.
In terms of the ASCOM Driver, I had to install a separate (3rd party) Driver for the Tak mount as Takahashi do not provide one, but you’ll have to read your mount manual to see what you need to do for the HEQ5. On my Vixen mount I think I had to set the Baud Rate as well as the Stop Bit to configure it for e.g. Starry Night Pro.
Cheers
Dennis
PS – PCMCIA is now old technology, the new (smaller) cards are called PCI cards I think?
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