Campbell MD9 Instrukcja Użytkownika Pobierz pdf

Local Area Datalogger Networks

Model MD9 Multidrop Interface

The MD9 Multidrop Interfaces* link a computer to as

many as 200 dataloggers (CR510, CR500, CR10(X), 21X,

CR23X, and CR7) over a single coaxial cable. Each data-

logger in the network is connected to an MD9 that has a

unique, user-assigned address. Communication

between the computer and a specific datalogger is rout-

ed through the MD9’s address allowing the rest of the

network to remain in quiescent mode. Total coax cable

length can be up to three miles; each MD9 in the net-

work slightly reduces the maximum transmission dis-

tance (see page 2).

The network is accessed through the computer’s serial port. LoggerNet Datalogger Support Software supports

station addressing, data retrieval, and monitoring. Remote MD9 networks are accessed by telephone (see

page 3) or radio telemetry (contact Campbell Scientific).

Features

• Cost-effective network of multiple dataloggers connect to a computer via one coaxial cable

• BNC connectors simplify system installation and expansion

• Low current consumption allows remote MD9s to be powered by the datalogger’s power supply

• Telecommunications supported at rates up to 9600 baud over a three mile distance

SERIAL I/O

COAX

MULTIDROP INTERFACE

MD9

MADE IN USA

2121

PS12 POWER SUPPLY

WITH 12V CHARGING REGULATOR

MADE IN USA

WARNING:

PERMANENT DAMAGE TO RECHARGEABLE

CELLS MAY RESULT IF DISCHARGED

BELOW 10.5 VOLTS

FUNCTION

INT

EXT

BAT

CHG

OFF

CHG

+12

PS12 BATTERY

EXTERNAL BATTERY - DO NOT USE WITH

INTERNAL RECHARGEABLE BATTERY

CHARGE VOLTAGE PRESENT

INPUT FROM CHARGER OR SOLAR PANEL

16-26 VDC OR AC RMS: POSITIVE TO

EITHER TERMINAL, NEGATIVE TO OTHER

POWER TO DATALOGGER OR

12V PERIPHERALS

DIFF

GH L

AG H L AG H L AG E1 AG E2 G

DIFF

GH L

AG H L AG H L AG E3 AG G G

910

11 12

P1 G P2 G C8 C7 C6 C5 C4 C3 C2 C1 G 12V 12V

SDM

5V 5V G G

SW 12V

SW 12V CTRL

Logan, Utah

G 12V

POWER

CR10X WIRING PANEL

MADE IN USA

WIRING

PANEL NO.

EARTH

GROUND

CS I/O

CAMPBELL

SCIENTIFIC

INC.

MD9

MULTIDROP INTERFACE

MADE IN USA

SERIAL I/O

COAX

A Typical Station

The components of a typical

data acquisition station fit

within a 12” x 14” enclosure.

The PS100 supplies 12 Vdc to a

CR510, CR500 or CR10(X)

datalogger which powers and

communicates with the MD9

via the SC12 cable. The coaxial

cable is fitted with BNC con-

nectors which attach to a BNC

“T” connector at the MD9. The

station shown at right is the

final station on the cable, as

the continuation of the coaxial

cable has been replaced by the

MD9CT. This device attenu-

ates the signal to prevent it

from reflecting back through

the coaxial cable and causing

interference.

12 V Power Supply

ENC 12/14 Enclosure

CR10X

SC12 Cable

MD9CT Coaxial Terminator

BNC “T” Connector

BNC Connector

Coaxial Cable

*The MD9 cannot be used in an MD485 network.

1 2 3 4

Podsumowanie treści

Strona 1 - A Typical Station

Local Area Datalogger NetworksModel MD9 Multidrop InterfaceThe MD9 Multidrop Interfaces* link a computer to asmany as 200 dataloggers (CR510, CR500, C

Strona 2 - Network Design Considerations

MD9 Network ConfigurationEach MD9 network requires:1) User-supplied IBM-compatiblecomputer, -PC or greater. LoggerNet Software recommended.2) RS-232 s

Strona 3 - Specifications

HayesCompatibleModemMD9DataloggerMD9DataloggerMD9DataloggerMD9SurgeProtectorCSI FieldModemPS100/A100Environmental EnclosureAC Power orSolar PanelBNC

Strona 4 - Campbell Scientific, Inc