execution of all clients. More information can be found at the JACK web
site, http://jackit.sourceforge.net/.
1.2.1 Serial Ports
Commonly known in the DOS/Windows world as 'COM ports', serial ports are often
used to communicate with outboard gear, such as satellite receivers and audio switchers.
Up to eight serial ports can be accessed simultaneously by each Rivendell host.
1.2.2 GPIO/Switcher Devices
Because these capabilities are often (although not always) bundled together in the same
device, Rivendell lumps GPIO and switcher devices together within the same class.
'GPIO' stands for 'General Purpose Input Output'. As the name implies, these devices can
be used to interface to a huge variety of outboard equipment by means of control lines.
GPI (General Purpose Input) lines can be used to sense changes in an outboard system's
state (and Rivendell programmed to take various actions on the basis of that), while GPO
(General Purpose Output) lines can be used to send commands to an outboard system.
The actual physical interfacing of GPIO devices is complex and generally beyond the
scope of this document. Readers are encouraged to consult a good handbook on radio
engineering for more information. A current list of GPIO/Switcher devices supported by
Rivendell can be found in 'docs/GPIO.txt' file in the Rivendell sources.
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