Product Description:
You may order one or more options installed as
mentioned in the opening paragraph of this description. The following
paragraphs describe these options.
- Computer Power Monitor: Three computer power supplies (+5V, +12V,
and -12V) are monitored. If one or more of those voltages are more than
+6% outside of their nominal values, then two bits of a
Status Register indicate whether there is an overvoltage or an
undervoltage. In addition, an interrupt request can be generated.
- Computer Temperature Monitor: If this option is installed, Option
01 must also be installed. This option monitors ambient temperature
inside the computer chassis. The temperature monitor circuit compares
the output of an LM334 temperature sensor with a preset DC voltage
level. The output of the comparator circuit can be read at a bit
location of the Status Register and, also, can cause an interrupt
request if that temperature exceeds the factory preset limit (50oC).
- Computer Temperature Measurement: This option requires presence
of both Option 01 and 02. When this option is included, an onboard 8
bit A/D converter provides means for a software read of the measured
temperature. Resolution is to approx. 0.7oF.
- This option provides three functions as follows:
- Change of State: Differential digital inputs are accepted
through pins 17 & 18 (ISOIN0) and pins 19 & 20 (ISOIN1), are
opto-isolated and reported in the Status Register. The change-of-state
also generates an IRQ interrupt request.
- Buzzer: The buzzer is under software control and can be turned
on by programming a "write" to Base Address + 4 or off by programming a
"write" to Base Address +5 if Counter #2 is configured in mode 1.
Configuring Counter #2 in mode 0 will defeat the buzzer entirely.
- Opto-Isolated Outputs This option provides an opto-isolated
reset signal at pins 4 and 5 (Isolated Reset Output) of the DB25F
connector. An opto-isolated inverse of the reset signal is also
provided across pins 6 and 7 (Isolated NOT Reset Output) of the same
connector.
- This option replaces the opto-isolated reset output capability of
Option 04 with capability for two isolated digital outputs under
computer control. Option 04 must be installed.
- Fan Speed: This function is usable only in computers which use
fans that have a tachometer output. If fan speed falls to unsafe levels
(i.e., if the tachometer output falls to less than 50pps), an interrupt
request is generated. (Both Options 01 and 02 must be installed)
Status Monitor Options
- Option 1: IRQ and status register indication if +5, +12, or -12 V
exceed +/- 6% of nominal.
- Option 2: Temp. Alarm IRQ and status register indication at 122o
F and above.
- Option 3: Temp. Measurement from A/D converter, LSB = 0.7o
F (factory adjustable).
- Option 4: Fan Speed: IRQ and status register indication whenever
fan's tachometer output drops below 50pps (custom factory settings
available).
- Buzzer: Audio Alert signals watchdog timeout. Can be disabled
by software.
- LED Output: 5VDC, through 470 ohm resistor
- Isolated Outputs: Complementary opto-isolated reset outputs
(2).
- Isolated Inputs: Two, opto-isolated, 5 mA typical load. Can
be read at base address + 4. These bits generate Change-of-State IRQs.
- Option 5: Replaces opto-isolated Reset outputs with computer
generated digital outputs. The Buzzer does not function when this
option is installed.
- Option 6: Pulse-width modulates power to the fan to control fan
speed. Speeds fan up when excessive internal computer temperature is
sensed.
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