Appendix C: Options for the KPC-9612 Plus
Low Power Operation
Your KPC-9612 Plus is capable of very low power operation. In order to achieve
the lowest power consumption possible, you must turn the front panel LEDs off
with the command LEDS OFF. Also, the modem must be set for INTERNAL
carrier detection with the command CD INTERNAL. In this configuration, the
KPC-9612 Plus will draw less than 15 ma when no signal is being received.
Note, however, that the actual current drain may vary slightly depending on the
RS-232 connections to the unit. Some computers will cause the current drain to
be slightly higher than other computers.
If you use software carrier detection (CD SOFTWARE) the current drain will be
higher in the “idle” mode since the processor is actively looking for data even
when no signal is present.
Very Low Power Operation
KPC-9612 Plus circuitry is powered from a linear low dropout regulator at 5.0V
nominal. At this voltage, current requirements vary from approximately 16 ma
(unit idle and LEDs OFF) to 23 ma (unit transmitting and LEDs ON). By placing
a jumper on J24, the output of the voltage regulator is reduced from 5.0V to 3.3V
nominal, thus reducing power requirements nearly in half. The current require-
ments in this case vary from approximately 8.5 ma (unit idle and LEDs OFF) to
12 ma (unit transmitting and LEDs ON).
Notes on low power operation:
The 3.3 volt mode of operation has not been
thoroughly tested in the field and is not guaranteed. The unit may not function
properly over extreme temperature ranges when operating at 3.3 volts. Some
higher speeds (greater than 19200 baud) may not be possible with low power op-
eration. Also, the real time clock chip used in the KPC-9612 Plus (Dallas
DS1215) has not been rated for operation at 3.3 volts, so when using 3.3 volts, the
DS1215 chip (U25) must be removed and jumpers J22 and J23 set (see jumper
section).
Low Power Operation
Appendix C: Options for the KPC-9612 Plus
KPC-9612 Plus v 8.2
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User’s Guide
Содержание KPC-9612 Plus
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