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參數(shù)資料
| 型號： | PCSYSCON |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 19/36頁 |
| 文件大?。?/td> | 383K |
| 代理商： | PCSYSCON |
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It is well worth using the DACs as explained earlier to measure the
voltages in your PC. The example software has a simple program to
do this.
Temperature monitoring
The PCSYSCON has a on-board temperature monitor to measure
the internal temperature of the PC. This generates an alarm when
the temperature is in excess of that set by the voltage from the
DACTEMP DAC. The correct temperature to set depends on
ambient temperature, fan cooling efficiency and PC design. It is a
good idea to measure temperature rise for some hours after switch
on using the program mentioned above.
Option inputs
The two option inputs can each be used with either analogue or
opto-isolated digital inputs. They are intended for use with power-fail
signals from power-supply units, fan-fail signals from electronically-
controlled fans, or general-purpose alarm inputs. The difference
between Opt1 and Opt2 is that one works in the presence of the
signals and the other works in their absence. Either or both can be
masked out by the mask registers.
In analogue input mode the single-ended analogue signals are fed
to comparators whose trip points are set by potentiometers VR1 (for
Opt2) and VR2 (for Opt1). LEDs D7 and D6 indicate when the trip
points are reached. Trip points can be set for analogue voltages of 0
to +20V.
In digital mode, currents are passed through resistors to
optoisolators. The resistors are suitable for input voltages of 12 to
24V.
Because the analogue and digital inputs both drive the same alarm
signal, only certain combinations of signals are possible.
The analogue high and low refer to the input voltage compared to
the potentiometer setting. With no signal wire connected to the
analogue input each potentiometer can be adjusted to allow the
digital input to function. Opt2 will give an alarm with nothing
connected, however. If you do not wish to use this, make sure that
you have masked off alarms from Opt2 in the mask registers.
2192-09065-000-000
Section 3. Using the PCSYSCON
Page 19
J278 PCSYSCON
Digital
ignored
high
low
ignored
high
low
alarm
alarm
no alarm
no alarm
no alarm
alarm
opto current
no current
no current
opto current
no current
no current
Opt1
Opt2
Analogue
Result
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