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The diagram below shows the connection of external GPIO and Serial devices to the TallyMan
Redundancy system when Backup is Active and hosting the Virtual IP addresses:
Using a Changeover device
An alternative approach is to use a changeover device such as the TSL SW2x1 changeover frame. The
required GPIO and Serial connections are routed thorough the changeover device from both the Primary
and Backup TM1 units. The output of the changeover device is then connected to the equipment as
required. The operation of the changeover unit is controlled by the GPO of a TMRP that will reflect the
status of the current system. The connections from the Active system controller will then be routed to
the output of the changeover unit and then on to any third-party devices as required.
The diagram below shows GPIO and Serial connections connected to third-party equipment via a
changeover unit, controlled by the GPIO system status of the TMRP. Multiple TMRP units can be
paralleled for changeover control redundancy:
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