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Canon E3 Connector
The Canon RS60-E3 remote control, used on Canon EOS cameras, is a two-position switch just like the shutter release on the Canon EOS series. Pushing the button down halfway causes the camera to focus, while pushing the button down all the way causes the camera to release its shutter. The wired remote control transmits the signal though a standard 2.5mm (sub-mini) audio head. The contacts on the head are numbered in Figure1-5.
FIGURE 1-5:The E3 connector pins
When the button on the remote control is pushed halfway, contact sections 1 and 2 are shorted together, causing the camera to focus. When the button on the remote control is pushed all the way, all three contact sections are shorted together, causing the camera shutter to be released. Pin 1 is actually the ground connector. Therefore, pin 1 and pin 3 cause the camera to trigger. When you build your own camera interface, you can split the auto-focus and shutter release functions by using two switches (using two independent circuits).