Campbell CDM-A100 Series, Instruction Manual

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CDM-A100 Series
11
•
Earth Ground Lug (
⏚
) – connection point for a heavy-gage earth-
ground wire. A good earth connection is necessary to secure the
ground potential of the CDM-A100 and shunt transients away from
electronics. 14 AWG wire, minimum, is recommended.
5.1.5 Power Terminals
5.1.5.1 Power In
The removable Power connector is the connection point for external power
supply components. The power supply must be in the range of 10 to 32 Vdc.
5.1.5.2 Power Out
The CDM-A100 can be used as a power source for sensors. The following
voltage terminals are available:
•
12V and SW12V – Regulated 12 Vdc when the supply voltage is 14.5
to 32 Vdc. Below 14.5 Vdc, the voltage tracks the power supply.
Current output is limited to 200 mA.
•
SW5V – See Section 6.5.3 , Switched 5 Vdc
(p. 16)
, for information on
voltage and current sourcing limits.
5.1.6 Communication Ports
5.1.6.1 USB Port
One micro-B USB port, labeled USB, for communicating with a PC through
Device Configuration Utility
(p. 32)
software.
5.1.6.2 CPI Port
CPI
(p. 32)
is a proprietary protocol that supports CDMs. Two RJ45 ports labeled
CPI enable communications with a Campbell Scientific datalogger and other
CDMs.
5.1.7 LED Indicators
5.1.7.1 COMM Status
When the CDM-A100 has successfully been configured by a datalogger, the
COMM Status
LED
(p. 32)
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 TABLE
10-2 , COMM Status LED Activity
(p. 31)
.
5.1.7.2 CPI Port
When the CDM-A100 has successfully been configured by a datalogger, the
green
LED
(p. 32)
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. See TABLE
10-3 , CPI Port LED Activity
(p. 31)
.
6. Specifications
All CDM-A100 units are tested to meet electrical specifications in a standard
–40 to 70 °C, or extended –55 to 85 °C, non-condensing environment.
Recommended calibration interval is every three years.