Guralp Systems CD1.1 - Manual (Page 30)

CD1.1 Tools for Platinum
•
Digitising equipment open;
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Vault door opened;
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Authentication seal broken;
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Equipment moved;
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Future use (channel security bit 6);
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Future use (channel security bit 7); and
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Future use (channel security bit 8).
For each of these, the “tamper line” that should set this bit can
be selected from a drop-down menu. The options on those
menus vary considerably depending on the precise hardware
configuration of the CMG-EAM. You must enable tamper line
monitoring for each line you wish to use here: this is done in
the GPIO configuration page (directly accessible from the top-
level configuration menu).
Various continuous values, such as voltages and temperatures,
can also be monitored and compared to configurable threshold
values. If the threshold is exceeded, a status bit can be set in
the CD1.1 header.
The bits that can be controlled in this way are “Main power
failure” and “Backup power unstable”. For each of these, a
value to be monitored and a threshold value can be configured.
The value to be monitored is chosen from a drop-down menu.
The items on this menu vary with the precise hardware
configuration of the CMG-EAM but typically include the choice
of voltage, current or power for each monitored power bus.
You must enable line monitoring for each value that you wish
to use here: this is done in the GPIO configuration page
(directly accessible from the top-level configuration menu).
After the voltage indicator byte in the CD1.1 header, there are
three reserved bytes available for future use. If desired, these
can be populated with three sets of eight-bit digitised property
values. The final part of the “System monitoring” table allows
the operator to select which properties are used to populate
these bit-fields and the scaling (units) to be used.
30 Issue C