APPENDIX A
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GPIO OPERATION
Bit 2 is the manual failover trigger:
xxLxx = trigger a manual failover. This will cause the secondary input to be selected and the
failback logic to be activated.
xxHxx = manually clear a failover. This will cause the primary input to be selected and normal
failover logic to be activated.
Bits 3 and 4 select the secondary input. They work the same way as bits 0 and 1
The reporting functions works just the opposite way. When one of the above states is assumed
(due to control from GPO or any other source) the corresponding transition is created on the
corresponding pin of the corresponding GPI port. Virtual GPI assignments are the same as the
GPO assignments listed above. For example, changing the primary input to analog will cause
“GPI 2 Lxxxx” (where “x” is replaced by “h” or “l” depending on the previous state of the GPI)
to be issued to interested LWRP clients.
GPI 1 is used for the physical GPI port on the rear panel. Changes in its state are reported direct-
ly using LWRP.
Because the pin-based protocol was designed for use with physical contact closures, the result
of each go-high or go-low event may depend on the previous state of the pins and certain results
cannot be achieved without going through intermediate states. Thus, it is not recommended for
use when control is being done directly by computer software over a TCP connection. In this
case, there is a stateless command-based protocol available.
The command-based protocol is also a part of LWRP, and accessed using a TCP connection to
port 93. It is implemented using the LWRP GPO <n> CMD: command. Arguments are given in
the LWRP command (in quotes after CMD: ) to control the Omnia. Each GPO port maintains
the same function as listed above for the pin-based protocol, and will only accept CMD: argu-
ments that relate to that function. The following arguments are supported, listed by port:
GPO 2:
-- SEL <preset name> -- Select the preset with the given name, putting it on air. The names are
the same ones displayed by the front panel or remote. Note: A list of names may be obtained by
issuing an http GET of /cgi-bin/presetlist.cgi (from the webserver on the Omnia). This will
give an http response containing a text/plain document that contains preset names, one per line.
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