9
GPIO and Serial Connections
The GPIO and Serial connections of TM1 in a redundant system can be setup in the following ways:
• Using a VIP connection (preferred)
• Using a Changeover device
Using a VIP connection
In this approach, the Serial and GPIO are moved outside of the redundancy ‘bubble’ and interface to the
system via the VIPs. To achieve this, we use a GPIO expansion device such as the TSL ESP-1R+. This
expansion device will then connect to the system via the VIP address and communicate with the system
without any requirement to know which TM1 is currently Active.
Serial devices can be set up in a similar way using an Ethernet-to-Serial convertor. The convertor will
communicate to the TallyMan system using a VIP address and continue to operate after a Failover event
has occurred.
The diagram below shows the connection of external GPIO and Serial devices to the TallyMan
Redundancy system when the Primary is Active and hosting the Virtual IP addresses:
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