PB-7700 series Technical Manual 5 - 5
<18> and it has to be sent in same way like the ON only switch command. This
enhanced forced power off requires the user to keep the switch pressed for a longer
period between 10 to 20 seconds to function.
In case the system halt situation is so serious that some hardware/firmware
registrations are already confused, this above mentioned forced power off could though
very unlikely still fail. When such situation happens, please remove the external power
input from the adaptor and disconnect the UPS battery for few minutes to reset the
hardware registers.
One example of the need for this forced power off function could happen when
power switch is triggered within 10 seconds of last switching off. It is a common
practice that once the system power is switched off there should be some waiting time
before next switching back on. If the system power is switched off and on in very short
time, chances are the system LED could indicate power on status while the system
remains off. In such case, please use the forced power off function to cancel the error
and wait for 10 seconds before switching on again.
UPS FUNCTION ENABLING
The complete UPS function requires use of the optional UPS battery. The
Posiflex UPS functions can support the system against intermittent power failure.
However, in order to achieve best hardware stability against any possible memory or
CMOS data loss or even system crash, the UPS function should be enabled or disabled
depending on the existence of UPS battery. This setup is based on the consideration that
when UPS battery is present and ready to serve, the UPS function should be enabled so
that the hardware power good signal will be maintained for a smooth power transition
to UPS battery power. On the other hand, when there is no UPS battery, the UPS
function must be disabled so that the hardware power good signal will be shut down
early enough to inhibit any improper operation of any device.
This setup on UPS function is in fact automatically taken care of with the
Posiflex software installed in the preloaded operating system of Windows. However,
just incase the application programmer wants to manipulate this setting or if the
operating system used is some one else, this setting can be achieved by sending
following command string to COM1 port under protocol: 9600 bps, parity none, 8 data
bits, 1 stop bit.
Summary of Contents for PB-7700 Series
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