Campbell Scientific CR200/CR200X-series Dataloggers - Manual (Page 40)

Section 3. Overview
3.1.3.4 Power Terminals
Read More! See CR200(X) Power Supply (p. 53).
Power In
• Power Supply: External battery is connected to Battery+ and Battery-
terminals.
• Input voltages in excess of 18 V may damage the CR200 and/or power
supply. Power to charge a 12 V lead-acid battery (16-22 VDC) must be
connected to the Charge+ and Charge- terminals NOT to Battery+ and
Battery-.
Power Out
• Peripheral 12 V Power Source: 1 terminal (SWBattery) and the associated
ground (G) supply power to sensors and peripheral devices requiring
nominal 12 VDC. Sensors and peripheral devices may also share a
connection to the Battery+ and Battery- terminals which is the same as
connecting them directly to the battery. This supply may drop as low as 7
VDC before datalogger operation stops. Precautions should be taken to
minimize the occurrence of invalid data from underpowered sensors.
3.1.3.5 Communications Ports
Read More! See Telecommunications and Data Retrieval (p. 131) and PakBus
Overview (p. 133).
The CR200(X) is equipped with an RS-232 communications port. This port
allows the CR200(X) to communicate with other computing devices, such as a
PC, or with other Campbell Scientific dataloggers.
Note RS-232 communications normally operate well up to a transmission cable
capacitance of 2500 picofarads, or approximately 50 feet of commonly available
serial cable.
• 9-pin RS-232: Non-isolated port for communicating with a PC through the
supplied serial cable, serial sensors, or through 3rd party serial
telecommunications devices. Acts as a DTE device with a null-modem
cable.
Read More! See APPENDIX. Serial Port Pin Outs (Appendix p. 21).
Some versions of the CR200(X) include an optional spread spectrum radio for
wireless communication with other devices equipped with a spread spectrum
radio.
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