Not sure about the HEQ5pro mines a EQ5 with synscan upgrade, but my setup has a DSI guide cam connected to the lappy via a usb port and the mount connected through the Handpiece to the com1 serial port using the standard cable supplied with the mount, connecting to the port on the motor driver does not work. PHD is the guiding program.
Ascom driver is the celestron one you mentioned.
Bill
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