Thanks to everyone who responded to my message recently about this
device. I've done a bit more reverse-engineering/testing, and thought
the result might be of interest. If the following writeup is
uninteresting, click Delete now, and Merry Christmas to everyone.
_All About the CDKZQ-8L Remote Switch_
This unit is a very inexpensive 8-relay remote switch.It uses a 315-MHz
radio link between the battery-powered controller and the receiver, and
each of its 8 relays is rated to handle 20 amps at either 14 VDC or 125 VAC.
The controller has 8 buttons.The first two are larger, but all appear to
operate identically, except when programming (see below).
You must take the receiver unit out of its plastic case to program
it.Once you have done so, place the receiver unit so that the
programming button and its associated LED are at the lower right.The
eight relays are arranged like the pins on an IC, and their numbering
follows this convention.Hence, relay 1 is at the upper left, relay 4 at
the lower left, relay 5 at the lower right, and relay 8 at the upper right.
Each relay is SPDT/normally open, and three terminals are available for
the user, labeled A, B, and C.B is the common terminal, A is the
normally open side of the relay, and C is the normally closed side.
The receiver unit requires 12V DC.DC is supplied to the 2-terminal strip
at the top center of the unit, when positioned as above.The strip is not
marked, but the terminal nearest the large diode next to it is "+";the
diode will keep you from making a mistake, by blocking voltage from the
unit if you connect it incorrectly. One spec sheet suggests that this
diode may also enable it to be powered by 12 VAC. I have not tried this.
The current drawn depends on the operating mode and, in
latching/non-interlocked mode, on the number of relays activated
simultaneously.With just the receiver operating, the unit draws 5.6 mA.A
single relay raises that to approximately 56 mA, and each additional
relay adds about 50 mA.
The receiver/relay unit can be programmed to operate in one of three modes:
1.Latching -- press a button, and the corresponding relay is energized,
and stays energized until the button is pressed again.
2.Non-latching (momentary) -- press a button, and the corresponding
relay is energized so long as the button is pressed.Release the button,
and the relay is de-energized.
3.Interlocking -- press a button, and the correspondingrelay is
energized until another button is pushed.
Programming is very simple.Momentarily press the programming button on
the receiver unit.The LED next to it will light.Then press the button on
the controller corresponding to the mode you want, as numbered above.The
LED will flash quickly a number of times, indicating that the receiver
has been programmed.To clear the programming and return the unit to its
original state, press the programming button again.
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
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