Campbell CDM-VW300 Series Manuel d'utilisateur télécharger 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.

Enclosure/Stack Bracket

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

lect data under extremely harsh conditions. The 28960 Enclosure

Stack Mounting Kit allows a small peripheral to be placed under the

mounting bracket, thus conserving space.

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.

Power Supplies

Typically, the CR800 and CR850 dataloggers are powered using a

PS200 power supply, PS100 power supply, or BPALK battery pack.

The PS200 and PS100 provide a 7 A h 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 batteries with a 7.5 A h rating at 20°C.

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

nominal ratings of 12 and 24 A h, respectively. These batteries should

be connected to a regulated charging source (e.g., a CH200 or CH100

connected to a unregulated solar panel or wall charger).

The PS200 and CH200 (above) are micro-controller-based smart char-

gers that have two input terminals that allow simultaneous connec-

tion of two charging sources.

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Campbell CDM-VW300 Series Manuel d'utilisateur Page 3

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