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6. Front Panel Interaction
A center-biased three-position toggle switch is located to the left of the front panel display. This is used to show
the unit’s serial number and options, and to set the unit’s IP address.
Settings are stored in non-volatile memory and are restored when the unit is next powered-up.
A single movement of the switch, either upwards or downwards, enters the first step of the user interaction
where the unit’s serial number and option list is displayed. It is possible to return to the normal display by moving
the switch a second time in the same direction, or to inspect and/or set values by moving the switch a second
time, but in the opposite direction. Doing nothing will, after a few seconds, cause the display to return to normal.
Messages on the screen indicate the effect of moving the switch upwards (top line, left side) or downwards
(bottom line, left side).
After pushing the switch down, we see that the MSR serial number A202, with all options, is not time-
synchronised to other EtherSpaceLink units, is connected to a 100 Mb/s Ethernet, and that no user program is
connected to it:
Figure 6.1: The MSR serial number and configuration display
The chart below shows how to navigate the settings menus.
The current state is shown as a box with three sections. The top section shows a label that indicates the effect (if
any) of pushing the switch up. The middle section describes what is displayed. The bottom section shows a label
that indicates the effect (if any) of pushing the switch down.
Figure 6.2: Front panel navigation
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