Campbell CR800 Instrukcja Użytkownika Pobierz pdf (Strona 3)

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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

Two pulse channels 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

Four ports are provided for frequency measurements,

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

RS232-tologic 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 measure-

ments), 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 V that can be

switched on and o under program control.

Communication Protocols

The CR800 series supports the PakBus, Modbus, and

DNP3 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.

Transient Protection

Gas Discharge Tube (GDT) protects the inputs from

electrical transients. The CR800 series is CE compliant

under the European Union’s EMC Directive, meeting

ESD, EMC, Fast Transient standards.

Enclosure/Stack Bracket

A CR800 or CR850 housed in a weather-resistant enclosure

can collect data under extremely harsh conditions. The en-

closure protects the datalogger from dust, water, sunlight, or

pollutants.

The 17565 Stack Bracket allows a small peripheral to be

placed under the mounting bracket, thus conserving space.

With the bracket, a CR800 or CR850 can can be attached in

a “horizontal” orientation in an ENC10/12 enclosure (i.e., the

long axis of the CR1000 spanning the short axis of the enclo-

sure).

Power Supplies

Any 12-Vdc source can power the CR800-series dataloggers; a

PS100 or BPALK is typically used. The PS100 provides a 7-Ahr

sealed rechargeable battery that should be connected to a

charging source (either a wall charger or solar panel). The

BPALK consists of eight non-rechargeable D-cell alkaline bat-

teries with a 7.5-Ahr rating at 20°C.

Also available are the BP12 and BP24 battery packs, which

provide nominal ratings of 12 and 24 Ahrs, respectively.

These batteries should be connected to a regulated charging

source (e.g., a CH100 connected to a unregulated solar panel

or wall charger).

The CR800 series

can operate for

up to one year

using the PS100

power supply,

depending on

scan rate, number

of sensors, data

retrieval method,

and external

temperature.

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