Installation
C-11
Power should be supplied to the controller via the 2.5mm x 5.5mm DC power
plug (supplied).
• The center hold forms the positive (+) connection.
• The sleeve forms the negative (-) connection.
Note: Owners of alternatively-powered repeaters (solar, fuel cell, battery, etc.)
should be aware that the 7K has been designed to behave predictably when
the DC power source is slowly reduced. Such behavior is important to prevent
damage to the energy source. For example, some controllers will suddenly stop
operating (i.e. reset) when a low voltage limit is reached. If an output, such as
the transmitter PTT line, was enabled at the time, and the transmitter PTT line,
was likewise enabled, the transmitter could stay keyed until the power source
failed.
Your S-COM controller will cease microprocessor operation when the power
supply voltage fails, but it will also reset the digital outputs at that time. This
condition will be held until the power source voltage drops considerably. With
little load on the source. This will take a long time to occur.
Logic Inputs
The controller has the ability to monitor logical (ON/OFF) devices at the
repeater site. There are 7 Logic Inputs for this purpose. Any of the 3 Receiver
COR Inputs and the 3 CTCSS Decoder Inputs may be used as additional logic
inputs. Each logic input has a hardware interface that is similar to the repeater
receiver COR input. Refer to the Repeater Receiver COR section on page C-3
for details on the design of the input circuit.
The controller can sense either a low-to-high or a high-to-low transition, or
both, on each logic input. Therefore, there is no need for Sense-Reversal DIP
Switches on the 7 logic inputs.
Logic inputs are very handy for informing the controller when some external
condition has changed. Examples include detection of high water, high SWR,
power failure, intrusion, and so on. Since the controller will execute macro
commands upon sensing a change, the owner can control the action that will
be taken. (This is a big improvement over controllers that take fixed action
when an input is tripped, such as appending an alarm CW message to the tail.)
Logic Outputs
The controller has the ability to control logical (ON/OFF) devices at the
repeater site. There are 7 Logic Outputs for this purpose.
Each logic output has a hardware interface that is similar to the transmitter PTT
output, except that the power MOSFET devices are smaller. Refer to the
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