Read the Serial Control section of the Canon Camera Control product page at Astronomiser. Noted the statement that their special serial "cable should be used in conjunction with a USB cable (supplied with the [camera]) to use with software..." OK. So, two wires.
Stumbled across a thread in the O'Telescope forums. Noted a user describing how they could hook this up:
- use a serial cable to control the mirror lock function
- set the lock parameter on the camera
- and use the usb for camera communication and data transport
Verified the 40D was supported in the camera table matrix.
Perhaps I had wired up the simple circuit wrong. Perhaps I had the camera configured wrong. Hmph.
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