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e. If switch to camera 2 on video switch, then camera 2 tally light will on and camera 1 tally light will
off;
2. GPI I/O Output mode -Tally signal is sent by Keyboard Controller
a. Connect camera with keyboard by standard RS-422 control cable;
b. Access to KEYBOARD SETTING > GPI I/O > Setting, and change it to Output mode, then Exit to
home directly;
c. After done above operation, we can switch to different camera by keyboard, for example, if we
switch to camera 1 on keyboard, it will send tally signal to camera 1 via standard RS-422 control
cable, so camera 1 tally light will turn on, and keyboard can control camera 1 pan and zoom;
d. If switch to camera 2 on keyboard, then camera 2 tally light will on and camera 1 tally light will off;
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