CMG-DCM / AM - Güralp Systems Limited
CMG-DCM / AM - Güralp Systems Limited
CMG-DCM / AM - Güralp Systems Limited
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>CMG</strong>-<strong>DCM</strong> Data Communications Module<br />
• If the digitizer is not responding at all, check the power supply<br />
to the digitizer and the cable between it and the <strong>DCM</strong>.<br />
The <strong>DCM</strong> is receiving streams, but they do not contain any data.<br />
If the data you see is zero:<br />
• Increase the Y axis scale using the icon in<br />
Scream!'s Waveview window or the corresponding icon in the<br />
<strong>DCM</strong>'s Data Viewer.<br />
• Check the mass position outputs to see if the masses are locked.<br />
A properly unlocked and centred mass should show a mass<br />
position within 1000 counts of zero; a locked mass will give a<br />
value greater than 32,000 (or less than −32,000) counts. If your<br />
sensor has remote mass locking, you can unlock the masses by<br />
navigating to Actions → Digitizer setup and clicking Unlock<br />
sensor.<br />
Locking or unlocking the sensor mass typically takes several<br />
minutes to complete.<br />
• Check the connection between the sensor and digitizer and try<br />
again.<br />
If you cannot see the data in the stream, remove any constant offsets<br />
by clicking on the Zero streams icon<br />
window or the <strong>DCM</strong>'s Data Viewer.<br />
in Scream!'s Waveview<br />
The <strong>DCM</strong> receives streams, but gaps appear in the data some<br />
minutes after boot-up.<br />
Check that the baud rate between the digitizer and the <strong>DCM</strong> is<br />
sufficient for all the data streams you want to transmit. If it is not, the<br />
digitizer's output buffer will gradually fill up until no more data can be<br />
stored. Increase the baud rate of the digitizer through the <strong>DCM</strong> (or<br />
using Scream!), then set the baud rate of the <strong>DCM</strong>'s input port to the<br />
same value.<br />
If you are using triggered output streams, be especially careful to allow<br />
a high enough baud rate to transmit data from all possible output<br />
streams simultaneously, or you will observe gaps when an event<br />
triggers the digitizer.<br />
42 Issue F