Guralp Systems CMG-DCM build <10,000 - Manual (Page 260)

Acquisition Modules and Platinum Firmware Technical operation
For more information on the ports see section 2.5 on page 14. The connector
pinouts are the same as those for the Cylindrical Digitiser and are are given in
16.5 on page 273 and listed in the table below:
Port Section
Data Section 16.5.11 on page 283
Net Section 16.5.4 on page 276
GPIO Section 16.5.6 on page 278
USB Section 16.5.8 on page 280
GPS Section 16.5.10 on page 282
MAN-EAM-0003 260 Issue E - February 2014