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APPENDIX A

| 71

GPIO OPERATION

GPO 3:

-- PRI <src> -- Select the given source, <src>, as the primary input source. <src> must be one of:

ANA (for analog), AES (for AES/EBU), or LWR (for LiveWire).

-- SEC <src> -- Select the given source, <src>, as the secondary input source that will be used in

case of failover. <src> options are the same as PRI.

-- FOV SET -- Force a failover to occur, putting the secondary input on-air and engaging the

failback logic

-- FOV CLR -- Force a failback to occur, putting the primary input on-air and engaging the

normal failover logic. Note: if the failover function is defeated by setting the failover time to 0.0,

this command will not cause it to become activated.

The corresponding GPI ports issue reports using this same syntax. Whenever a preset is selected

by any means, GPI 2 will issue a “SEL <preset name>“. When the primary input is changed by

any means, GPI 3 issues a “PRI <src>“, and likewise for the secondary input with “SEC <src>“.

If a failover occurs, GPI 3 issues a “FOV SET”; if a failback occurs, it issues a “FOV CLR”. These

reports are sent to any client monitoring the GPI port using standard LWRP procedures; see the

LWRP documentation for more information. Note that these clients will also see reports of the

same changes issued in the pin-based protocol at the same time.

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