Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 54)

CDM-VW300 Series Dynamic Vibrating-Wire Analyzers
7.7.5 Earth Ground Connections
Earth grounding provides protection from static discharge, transients, and
power surges. Ground lugs are provided on the CDM-VW300 and the
datalogger for connection to earth ground with high-gage wire. Minimum 14
AWG ground wire is recommended. The earth side of the connection should
be to a grounding rod or other grounded device. Consult the datalogger manual
for more information on earth grounding.
FIGURE 7-14. Earth ground connections
7.7.6 Communication Connections
A CDM-VW300 analyzer can connect to both PC software via USB (DVWTool
or DevConfig) and the datalogger (through the SC-CPI, via RJ-45)
simultaneously. When connecting to a CDM-VW300 analyzer that is active
via CPI in this way, the device settings are locked. The settings shown in
DVWTool will reflect the settings that were configured on the device by the
datalogger CRBasic program using the CDM_VW300Config() instruction.
Even if the interface of the DVWTool software appears to make a change to one
of these locked settings, it will not be executed at the hardware level, so it will
have no impact on the operation of the device.
7.7.6.1 SC-CPI to CPI Bus Connection
See Appendix B, SC-CPI Datalogger to CPI Interface.
7.7.6.2 Datalogger to SC-CPI Connection
CR3000, CR1000, and CR800 dataloggers require a SC-CPI interface to
connect with the CDM-VW300. Connect 12V, G, C1,C2 and C3 from the SC-
CPI to the corresponding 12V, G, C1, C2, C3 ports of the datalogger, as
shown in FIGURE 7-15.
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