Campbell CR1000 Uživatelský manuál stáhnout pdf (Strana 3)

Communication Protocols

The CR1000 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g-

ured 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 datalog-

gers 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 CR1000 is used in conjunction with an NL240, NL201,

NL116, or NL121. Refer to the CR1000 manual for more information.

Power Supplies

Typically, the CR1000 is powered with a PS200, PS150, or BPALK. The

PS200 and PS150 provide a 7 Ah sealed rechargeable battery that

should be connected to a charging source (either a power converter

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).

Analog Inputs

Eight dierential (16 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

Three outputs provide precision excitation voltages for resistive

bridge measurements.

Digital I/O Ports

Eight 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 communi-

cations 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 CR1000 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).

Peripheral Port

One 40-pin port interfaces with the NL116 Ethernet Interface and

CompactFlash Module, the NL121 Ethernet Interface, or the CFM100

CompactFlash® Module.

Switched 12 Volt

This terminal provides unregulated 12 V that can be switched on and

o under program control.

Storage Capacity

The CR1000 has 2 MB of ash memory for the Operating System, and

4 MB of battery-backed SRAM for CPU usage, program storage, and

data storage. Data is stored in a table format. The storage capacity

of the CR1000 can be increased by using a CompactFlash card.

Enclosure/Stack Bracket

A CR1000 housed in a weather-resistant enclosure can collect data

under extremely harsh conditions. The 31551 and 31143 stack brack-

ets 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.

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

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

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