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Watch-Dog RESET
The design of the RD105 module is of a conventional nature with the exception of the
RESET circuit. Due to the overall importance of the system's continuous operation, the
reset circuit is actually a Watch-Dog RESET circuit. Its function is as follows:
While the RD105 module is operating normally, a continually pulsing output is generated
by the on-board RD105 subrack management software. This pulsating signal is
monitored by the hardware circuit, being the watch-dog reset. If the pulsing output
should cease for more than 500msec, then the watch-dog reset circuit generates a new
hardware RESET to the microprocessor, restarting the module's management software
and attempts correcting the fault condition. Note, that the RD105 module also generates
a RESET command string that is sent to the MAXPRO-Net Server to force a re-
initialization of the system.
RD105 LED Indicators
There are four LED indicators on the RD105 module. Their functions are as follows.
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•
•
•
The 'SEL' and 'COMM' LED indicators are useful for following data communications
between the MAXPRO-Net Server and any module within a subrack.
Rev. C
RESET: Whenever the RD105 module resets, this RED LED (L1) illuminates. It
actually displays the logic condition of the CPU-FAIL signal on the bus.
POWER: Whenever power is applied to the RD105 module, this GREEN LED
(L2) becomes on, and remains on until the power is removed.
SEL: This YELLOW LED (L3) indicator blinks when any slot in the subrack is
written to.
COMM: When a MAX protocol command is received by the RD105 module, this
YELLOW LED indicator (L4) blinks.
7.6-2
HMXMU001018
10/06
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