Guralp Systems CD1.1 - Manual (Page 72)

CD1.1 Tools for Platinum
11 Configuring DM24s and CD24s
When data from CMG-DM24 and CMG-CD24 analogue to digital
converters (ADCs) are used (via the the GDI to CD1.1
converter), there are two configuration settings which should
be considered, state of health (SoH) reporting and block
latency. It is not absolutely necessary to reconfigure the ADC
but, if not done, sub-optimal CD1.1 subframes will be
generated.
11.1 SoH reporting
By default, the CMG-DM24 or CMG-CD24 will only output a
textual status block every 15 minutes or so. This is not
sufficient for the real-time channel status field for a CD1.1
subframe. Therefore, a new GCF block type, the Unified Status
block, was developed. This block is emitted every second, and
is used by the GDI subsystem on Platinum to acquire all the
status data needed for the CD1.1 channel status field.
If unified status blocks are unavailable, the CD1.1 frames will
still be valid, but will have several warning bits set (clock
differential too large, GPS receiver unlocked, GPS receiver off)
and there will be no way to determine the clock differential
from the subframe alone.
Unified status packets are turned on via a check-box near the
bottom of the digitiser configuration page of the CMG_EAM's
web interface (a menu item appears automatically for each
connected digitiser under “Configuration” → “System setup”).
Ticking this check-box issues the following sequence of
commands to the CMG-DM24 or CMG-CD24 (note: the CMG-
CD24 does not require the uspmonitor command):
ok-1
+monitor
uspmonitor
re-boot
Un-ticking this box issues the following:
ok-1
-monitor
72 Issue C