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Allstar denoted pins pp9 through pp12 are 'Input pins' listed as 'A#' in the parallel port scheme.
Special note: All these pins require 'buffering' by adding a transistor to do the actual switching.
They will not sink much current on their own.
In the case of some older radios you might interface, you might need to buffer with a transistor (2n2222 / 3904/3906)
AND a relay actuated by the buffer transistor. Mainly the PTT lines.
The best design is with optically-coupled transistors to prevent voltages and/or rf from running back through this port.
The unused output pins can be applied to switch things at the site. i.e. fan/light/alarm or even switching off other equipment.
Check command tables for info, not related to simple_usb.conf.
[[Category:Node Configuration]]
[[Category:Node Configuration]]