Watchdog Changeover Unit User Guide - Trilogy Communications

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3.8 GPITrilogy Communications LimitedWatchdogThe GPIs are used to interface with the other active and passive boards in the frame. GPI outputsindicate when a changeover has occurred: GPI inputs accept a command from other boards to cause achangeover. GPI input remote control is only active when turned on via the Statesman GUI. Boardswhich are responding to remote control via their GPI inputs must also be set to Automatic mode. For asystem with multiple cards where simultaneous switching is required, GPIs must be wired in a chain,linking out to in successively, forming a complete circle.GPI a (Channel 1) and GPI b (Channel 2) are configured as GPI outputs. They indicate the current stateof each channel: when inactive (open circuit) then input A is routed to the output when active (short circuit) then input B is routed to the outputGPI c (Channel 1) and GPI d (Channel 2) are configured as GPI inputs. They are used to remotelycontrol the changeover action of each channel: when the input is floating, signal input A is routed to the output when the GPI input is grounded, signal input B is routed to the output.All GPI inputs and outputs, from each slot in the frame are also available on a D type connectoradjacent to the power supply. When using the BNC rear connector, all GPI wiring should use thisconnector. Please see the Crystal Vision Indigo frame manual for more information.GPI e and f are currently unused.User Guide Issue 1.00 Page 16 of 28
Trilogy Communications LimitedWatchdog3.9 BOARD EDGE CONTROLS/STATUSThe edge of the board has switches to control the function of the board and status LEDs. The diagrambelow shows the layout for the board edge. The LEDs/Switches on the left are for channel 1 and thoseon the right for channel 2. The LEDs on the bottom indicate the status for input A; those on the topindicate the status for input B.3.9.1 Orientation3.9.2 DetailSignal Present/ValidUser Guide Issue 1.00 Page 17 of 28
Page 1 and 2: WatchdogUser GuideIssue 1.00TRILOGY
Page 3 and 4: Trilogy Communications LimitedWatch
Page 5 and 6: 1. APPLICATIONTrilogy Communication
Page 7 and 8: 2. INSTALLATIONTrilogy Communicatio
Page 9 and 10: 3. 370-10-00 ACTIVE BOARDTrilogy Co
Page 15: Trilogy Communications LimitedWatch
Page 19 and 20: 4. 370-11-00 PASSIVE BOARDTrilogy C
Page 23 and 24: Trilogy Communications Limited5. SO
Page 27 and 28: 6. SPECIFICATIONTrilogy Communicati

Watchdog Changeover Unit User Guide - Trilogy Communications

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