RS232 cable is required cable to connect a RS232 Port to a computer with a serial DE-9 interface:

Additional USB adapter / converter required for computers with USB Ports only

Original iOptron RS232 – ASCOM - Computer cable

Replacement iOptron RS232 –ASCOM – Computer cable
(reconfigured from a Skywatcher PC-ASCOM cable for Synscan with an RJ9 jack)

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