Model 5600ACO2 Automatic Changeover Unit
3.4. GPO TALLY OUTPUTS
There are two general purpose outputs that can be used to signal alarm conditions to the user. These
outputs are driven by normally closed relays inside the 5600ACO2. When the relay is energized
(active), the output will be pulled to +5 volts by a 10 K ohm pull-up. When the relay is de-energized
(normal) the relay contact will connect the output to ground. See Figure 2-3 for a schematic of the GPO
output circuitry.
GPO1 is used to indicate whether Master A or Master B is currently selected. It will be low when
Master A is selected and high when Master B is selected.
GPO2 is used to indicate whether the Master A and Master B inputs are identical and the power
supplies are functioning correctly or not. It will be high when the inputs are identical and the power
supplies are good, and will be low when the inputs are not identical, or one or both of the power
supplies is not functioning correctly.
The default condition of the 5600ACO2 outputs when there is no power applied is that the Master that
was last active will be selected, and will be indicated by the GPO1 relay.
Page 3-8
Revision 1.3 OPERATION
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