USKI-5 Universal Sequencer & Keying Interface
© Copyright 2015 QSK, llc
www.qskllc.com
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Channels that have inverted outputs will have their green front panel indicators illuminated when
in standby indicating that their outputs are closed and will turn off when opened during transmit.
Once the delays and any channel inversions are set, the sequencer is ready to program. To
program the sequencer, click on the “Program” button under the “Home” tab of the PICAXE®
editor. The editor program will indicate after a few seconds if the download was successful. If
so, the USKI-5 sequencer is programmed and ready to use.
Many applications will use relatively short delays. When keying the sequencer, it may be difficult
or impossible to see the delays on the green front panel indicator LEDs. It is therefore advisable
to first set much longer delays (maybe hundreds of milliseconds) so that the relative sequencing
and operation can be easily observed and verified with the indicators. This can be done with
only the controlling input devices connected to the sequencer and without the outputs
connected to the station equipment. Once the correct relative sequencing has been confirmed,
the sequencer can be reprogrammed with the delays necessary for normal operation.
CONNECTIONS TO THE USKI-5 SEQUENCER
The outputs of the USKI-5 sequencer are non-polarized and completely isolated so each can be
used without regard to ground or the polarity of the device being switched. Output connections
are simply made via the screw clamp terminals of the one piece output connector plug to the
appropriate channels as indicated on the
sequencer’s rear panel.
Input connections are made through the standard 3.5 mm stereo jacks J1 and J2. Each jack has
two inputs (Tip and Ring) which have designations such as J1T (Jack 1 Tip contact) or J2R
(Jack 2 Ring contact) as referenced in previous station configuration illustrations. Inputs are
controlled by external closure between the tip and sleeve or ring and sleeve contacts of the
mating 3.5 mm plug shown in figure 6.
FIGURE 6
See PROGRAMMER’S NOTES section at the end of this document for details about the input
connections and respective microcontroller pin connections and program designations.
WARRANTY