Campbell CR800 User Manual download pdf (Page 3)

Input Output Terminals

Analog Inputs

Three dierential (6 single-ended) channels measure voltage levels.

Resolution on the most sensitive range is 0.67 µV.

Pulse Counters

The CR800 and CR850 have two pulse channels that can count

pulses from high level (5 V square wave), switch closure, or low

level AC signals.

Switched Voltage Excitations

Two outputs provide precision excitation voltages for resistive

bridge measurements.

Digital I/O Ports

The CR800-series dataloggers include four ports for frequency mea-

surements, digital control, and triggering. Three of these ports can

also be used to measure SDM devices. The I/O ports can be paired

as transmit and receive. Each pair has 0 to 5 V UART hardware that

allows serial communications with serial sensors and devices. An

RS-232-to-logic level converter may be required in some cases.

CS I/O Port

AC-powered PCs and many communication peripherals connect

with the datalogger via this port. Connection to an AC-powered PC

requires either an SC32B or SC-USB interface. These interfaces isolate

the PC’s electrical system from the datalogger, thereby protecting

against ground loops, normal static discharge, and noise.

RS-232 Port

This non-isolated port is for connecting a battery-powered laptop,

serial sensor, or RS-232 modem. Because of ground loop potential on

some measurements (e.g., low level single-ended), AC-powered PCs

should use the CS I/O port instead of the RS-232 port (see above).

Switched 12 Volt

This terminal provides unregulated 12 Vdc that can be switched on

and o under program control.

Transient Protection

Gas Discharge Tube (GDT) protects the inputs from electrical tran-

sients. The CR800 series is CE compliant under the European Union’s

EMC Directive, meeting ESD, EMC, Fast Transient standards.

Communication Protocols

The CR800 series supports the PakBus, Modbus, DNP3,TCP/IP, FTP,

and SMTP communication protocols. With the PakBus protocol,

networks have the distributed routing intelligence to continually

evaluate links. Continually evaluating links optimizes delivery times

and, in the case of delivery failure, allows automatic switch over to a

congured backup route.

The Modbus RTU protocol supports both oating point and long

formats. The datalogger can act as a slave and/or master.

The DNP3 protocol supports only long data formats. The dataloggers

are level 2 slave compliant, with some of the operations found in a

level 3 implementation.

The TCP/IP, FTP, and SMTP protocols provide TCP/IP functionality

when the datalogger is used in conjunction with an NL201 or NL240.

Enclosure/Stack Bracket

A CR800 or CR850 housed in a weather-resistant enclosure can collect

data under extremely harsh conditions. The 31551 and 31143 stack

brackets allow a peripheral to be placed under the mounting bracket,

thus conserving space. The 31143 is hinged, allowing easy access to

the lower component during wiring or during maintenance.

Power Supplies

Typically, the CR800 and CR850 dataloggers are powered using a

PS200 power supply, PS150 power supply, or BPALK battery pack.

The PS200 and PS150 provide a 7 Ah sealed rechargeable battery

that should be connected to a charging source (either a power con-

verter or solar panel). The BPALK consists of eight non-rechargeable

D-cell alkaline batteries with a 7.5 Ah rating at 20°C.

Also available are the BP7, BP12, and BP24 battery, which provide

nominal ratings of 7, 12, and 24 Ah, respectively. The BP7 is typically

used instead of the PS150 or PS200 when the battery needs to be

mounted under the 31143 Hinged Stack Bracket. The BP12 and BP24

batteries are for powering systems that have higher current drain

equipment such as satellite transmitters. The BP7, BP12, and BP24

should be connected to a regulated charging source (e.g., a CH200 or

CH150 connected to a unregulated solar panel or power converter).

The PS200 (above) and CH200 can monitor charge input voltage, battery

voltage, on-board temperature, battery current, and load current.

The low-power requirements of our

equipment allow many remote sites to

be powered by a rechargeable battery

and a solar panel (SP10 shown above).

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Campbell CR800 User Manual Page 3

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