evertz X1201-AES4, Manual

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X1200 Series Router Manual
INSTALLATION
Revision 1.3.2
Page 2-9
Alternately, an external voltage source may be applied as shown in Figure 2-6. The Vext voltage must be
greater than the voltage supplied to the GPI by at least 5v.
GPI
15
25
5-50 VDC
GPI
Command
to
internal
circuit
4.7 K
220 Ohm
GND
Vext
Figure 2-6: Powering the General Purpose Input Opto-Isolators from an External Power Supply
2.5.2. Connecting the General Purpose Outputs
The Programmable GPOs are used to trigger alarms or to provide a limited tally capability. The GPOs will
be in the de-energised state when the power is off so all contacts will be closed. When the router is
powered up the GPO Relay contacts will open. An alarm or tally will cause a contact closure. The 4 GPO
contact sets can be operated in one of two encoded modes. The GPOs can be configured to operate in
one of 2 encoded modes. In these modes, many of the GPO contacts are pre-assigned to a function.
When the GPO Encoding is set to none, all 4 contact sets are available for the user to assign to particular
functions. Section 3.13.3 describes how each of the GPO encoding modes works and how to configure
the GPOs using the
GPO SETUP menu.
2.5.3. GPI/O Examples
By careful use of the GPI’s and GPOs one can create some unique control scenarios for controlling the
Router, Figure 2-7 shows one such application. By setting up jumpers for the GPI/O connector and setting
the GPI/O configurations in the router
Setup menu, one can create an auto changeover for a program
feed. In this configuration when input 1 fails and that input is currently selected on the output of bus V1,
The router will automatically select input 2.