PB-7700 series Technical Manual 5 - 4
system is rebooted or every time the program is executed to ensure the proper action of
the power switch. This function can also be achieved by use of the Posiflex Power
Switch Manager.
SOFTWARE SWITCH OFF
An easy method for software control to turn the system off is the software off
switch
if UM-7700 is installed
. The hexadecimal command string for software switch
off function is : <06> <16> <19> <1D> <n>.
In the above, the “n” indicates the time delay in seconds for actual power off
after the command string given to COM1. However, an alternative command string
<1B> <00> <00> <00> <00> <00> <00> <00> can be used instead to turn off the
system power immediately.
Some operating system or software may require complete termination of
application programs before system power off for the sake of system maintenance. In
that case the programmer has to program the command to close the application
programs (just like “Alt+F4” in Windows), and then at the end of the closing operation,
the application program should issue the above mentioned software switch off
command string to COM1 under the protocol: 9600 bps, parity none, 8 data bits, 1 stop
bit.
FORCED POWER OFF
In case of serious system halt due to system resources conflict or any reason, the
system could fail to power off through normal means. The Forced Power Off method is
designed for such occasions.
If there is no UM-7700 installed, press and hold down the power switch will
force the system power to shut down.
If the power management kit UM-7700 is installed, with the power switch
defined as power ON/OFF switch (default status), push down and hold this Power
ON/OFF Switch. The system will be powered off within 10 seconds in this way.
Whenever the machine receives a software command to change the power switch to ON
only, the forced power off function is disabled unless an enhance power off command is
received by the power management kit after changing the switch to be ON only. The
enhance forced power off command string is <1B> <00> <00> <00> <00> <00> <18>
Summary of Contents for PB-7700 Series
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