NHRC-10 User Guide
Copyright
1999, 2000, 2001, NHRC LLC. All Rights Reserved.
Page 11
2.8 Optional NHRC-10-DOUT Eight-Port Digital Control Output Board
The NHRC-10 can be equipped with the optional NHRC-10-DOUT eight-port digital
control output board. The NHRC-10-DOUT allows the NHRC-10 repeater controller to
control up to eight external loads. These outputs can be used to select power amplifiers,
disable voter channels, etc.
The NHRC-10-DOUT outputs are “open-drain” connections to power MOSFETs. These
outputs are active-low, and when activated, will pull the control signals to within a few
ohms of ground. These outputs can sink 100 mA or so. NHRC recommends that diodes be
used to protect the MOSFETs from back-EMF if these signals are used to drive relays.
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Note:
See Sections 4.7 and 4.8 for information on the configuration and operation
of the NHRC-10-DOUT.
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Note:
See Section 2.3 for information about the NHRC-10s built-in digital
output/fan control output.