080505
OPERATIONS MANUAL PPM-GX500
5
WinSystems does not provide software support for implementing the Interrupt
Status Register to share interrupts. Some operating systems, such as Windows
XP and Linux, have support for sharing serial port interrupts and examples are
available. The user will need to implement the appropriate software to share
interrupts for the other devices.
Power and Reset Interface
An optional reset button can be connected between pin 8 and ground. Momentary
contact between pin 8 and ground will cause the PPM-GX500 to reset. There is also a
reset push-button supplied on the
CBL-251-1
Multi-I/O cable.
Interrupt Status Register - 1ECH
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
N/A
N/A
N/A
PPS
N/A
N/A
COM4
COM3
Note:
A
1
will be read for the device(s) with an interrupt pending.
Power is supplied to the PPM-GX500 through the 8-pin Molex connector at
J7
. The
definitions for
J7
are:
Power Fail Reset
A precision voltage comparator monitors the +5V status. Upon detection of an
out-of-tolerance condition, the board is reset. This action is critically important
in the event of brown-out or power fail conditions. The reset circuit also ensures
that the power is nominal before executing a power-on reset. This circuit inhibits
the processor’s memory write line, preventing invalid data from being written to
nonvolatile memory during power fluctuations.
Visual
Index
1 2 3 4 5 6 7 8
o o o o o o o o
-12V
+12V
+5V
+5V
GND
GND
GND
RESET
J7
