CPI is a proprietary protocol that supports GRANITE Measurement Modules. Two RJ45 ports
labeled CPI enable communications with a Campbell Scientific data logger and other GRANITE
Measurement Modules.
7.1.7 LED indicators
7.1.7.1 COMM status
When the VOLT 100 series has successfully been configured by a data logger, the COMM Status
LED will flash green. For scan rates 500 ms or slower, it will flash at the scan rate. For faster scan
rates, the LED will flash green every few scans. See
7.1.7.2 CPI port
When the VOLT 100 series has successfully been configured by a data logger, the green LED on
the CPI port will flash. For scan rates 500 ms or slower, it will flash at the scan rate. For faster scan
rates, the green LED will flash every few scans. A flashing orange LED indicates bus activity. A
solid orange LED indicates a bus error. See
8. Specifications
All VOLT 100 series units meet electrical specifications in a standard temperature range of –40 to
70 °C, non-condensing environment. XD units are tested over an extended temperature range of
–55 to 85 °C. Recommended calibration interval is every three years.
8.1 Voltage measurements
Voltage measurements use a 24-bit Analog-to-Digital (A-to-D) converter. One channel at a time
is measured in numeric succession. Differential and single-ended channels can be mixed.
Terminals
Differential configuration
VOLT 108:
DIFF 1H/1L – 8H/8L
VOLT 116:
DIFF 1H/1L – 16H/16L
Single-ended configuration
VOLT 108:
SE 1 – 16
VOLT 116:
SE 1 – 32
Range:
±5000, ±1000, ±250 mV. See
VOLT 100 series
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