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40 S&C Instruction Sheet 1041-540
Updating Control Software
The update process may take 5 to 20 minutes. The progress is shown in the lower right
corner of the window. Once the update is complete, the window automatically closes.
Note:
If the software on the disk is not the same type as the software in the switch con-
trol, an error message appears. Note which software version is in the switch control,
and then press the <Enter> key to abort the update process. After securing the correct
new software version, repeat the steps on page 39.
S&C recommends the switch control have both battery and ac control power (or battery
and sensor power, if applicable) when updating the control software. If the control
software must be updated at a location where no ac control power is available, then the
user must follow the instructions in this document to override the automatic shut-down.
Protection System Logic
All functions of the switch control are directed by the CPU, including charging and
monitoring the battery system. If the CPU program stops or hangs, the control will not
function and the battery or circuits might be damaged. To indicate the CPU program is
functioning properly, it sets a bit on the PS/IO board every few seconds. If that bit goes
unset for 60 seconds, the PS/IO board disconnects the battery, shutting down the control
and preventing damage to the control circuits and battery.
During the update process, the CPU is unable to function and does not set the bit on
the PS/IO board. The protection logic disconnects the battery 60 seconds or less after the
update process begins. When ac control power (or sensor power) is present, the control
continues to operate without battery power and completes the software update. However,
if ac control power (or sensor power) is not present, the control shuts down, terminating
the software update. There is no damage to the control, and the update process can be
started again.
Manually Overriding the Battery Disconnect Command
The control software can be manually updated using only battery power by manually
sending a
Battery On
command to the PS/IO board. To do so, press the BAT ON switch
every 30 seconds. This white momentary-contact switch is located on the PS/IO board.
See Figure 12.
Updating the control software usually takes less than 5 minutes. Pushing the BAT ON
switch is generally easier than moving the control to a location with ac control power
or sensor power.
Updating Control
Software with Battery
Power Only
Figure 12. The BAT ON switch on the PS/IO board.
BAT ON
Switch