EverFocus EDR1640 Instruction Manual page 19

Matrix outputs 1~4: BNC connectors for Matrix monitor outputs 1~4.
SCSI Connector: For connecting the optional EDA800 storage expansion.
Mouse: PS/2 connector for mouse input.
S-Video: PS/2 connector for S-Video monitor output.
Cascade is designed for connecting a number of DVRs to one monitor.
You will be allowed to view and to control as many DVRs as you prefer from the
same monitor simply switching the screen using a multi-function keyboard controller.
Connect from Cascade out of the DVR to Cascade In of another with BNC
connectors. Repeat the same step for all your DVRs until you connect the last Cascade
Out to the original DVR's Cascade In.
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