The Canon version the pins are arranged in two rows side by side and the pins very tight. This way you can push the shutter using aids such as a credit card on the camera. They then work already. But this is very impractical.
The Nikon version the contacts are arranged differently, and here, the shutter can easily slide on the hot shoe without aids.
The flashes can reawaken with the release button on the remote trigger.
A finished release cable for Olympus does not exist. Here I want to tinker itself. With the release cable can trigger the camera over the RF603.