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Analog Inputs

Eight differential (16 single-ended) channels mea-

sure 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

 ree outputs provide precision excitation voltages for

resistive bridge measurements.

Digital I/O Ports

Eight ports are provided for frequency measurements,

digital control, and triggering.  ree of these ports can

also be used to measure SDM devices.  e I/O ports

can be paired as transmit and receive. Each pair has 0

to 5 V UART hardware that allows serial communica-

tions with serial sensors and devices. An RS232-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.  ese 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 measure-

ments (e.g., low level single-ended measurements),

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 NL115 Ethernet

Interface & CompactFlash Module, the NL120 Ether-

net Interface, or the CFM100 CompactFlash® Module.

Switched 12 Volt

 is terminal provides unregulated 12 V that can be

switched on and o under program control.

Storage Capacity

 e CR1000 has 2 MB of  ash memory for the Operat-

ing System, and 4 MB of battery-backed SRAM for CPU

usage, program storage, and data storage. Data is stored

in a table format.  e storage capacity of the CR1000

can be increased by using a CompactFlash card.

Communication Protocols

 e CR1000 supports the PB, Modbus, DNP3,

TCP/IP, FTP, and SMTP communication protocols.

With the PB protocol, networks have the distrib-

uted 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.

 e Modbus RTU protocol supports both  oating

point and long formats.  e datalogger can act as a

slave and/or master.

 e DNP3 protocol supports only long data formats.

 e dataloggers are level 2 slave compliant, with some

of the operations found in a level 3 implementation.

 e TCP/IP, FTP, and SMTP protocols provide TCP/IP

functionality when the CR1000 is used in conjunction

with an NL115, NL120, or third party serial IP device.

Refer to the CR1000 manual for more information.

Power Supplies

Any 12 Vdc source can power the CR1000; a PS100 or

BPALK is typically used.  e PS100 provides a 7-Ahr

sealed rechargeable battery that should be connected

to a charging source (either a wall charger or solar

panel).  e BPALK consists of eight non-rechargeable

D-cell alkaline batteries 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.  ese batteries should be connected to a

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

a unregulated solar panel or wall charger).

Enclosure/Stack Bracket

A CR1000 housed in a weather-resistant enclosure

can collect data under extremely harsh conditions.

The 17565 Stack Bracket allows a small peripheral

to be placed under the mounting bracket, thus

conserving space. With the bracket, the CR1000

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 enclosure).

Above shows a side view of the stack bracket. The

CR1000 is fastened to the bracket via Velcro straps.

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