Campbell RWIS STATIONS Instruction Manual

INSTRUCTION MANUAL

RWIS Stations

3/05

Copyright (c) 2005

Campbell Scientific, Inc.

Warranty and Assistance

The RWIS STATIONS are warranted by CAMPBELL SCIENTIFIC, INC. to
be free from defects in materials and workmanship under normal use and
service for twelve (12) months from date of shipment unless specified
otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s
obligation under this warranty is limited to repairing or replacing (at
CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer
shall assume all costs of removing, reinstalling, and shipping defective products
to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will
return such products by surface carrier prepaid. This warranty shall not apply
to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to
modification, misuse, neglect, accidents of nature, or shipping damage. This
warranty is in lieu of all other warranties, expressed or implied, including
warranties of merchantability or fitness for a particular purpose. CAMPBELL
SCIENTIFIC, INC. is not liable for special, indirect, incidental, or
consequential damages.

Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs
for customers within their territories. Please visit www.campbellsci.com to
determine which Campbell Scientific company serves your country. To obtain
a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC, INC., phone [phone]. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container.
CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____
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CS500 Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.

1. General........................................................................1

2. Specifications .............................................................1

2.1 Temperature Sensor ..................................................................................1

2.2 Relative Humidity Sensor .........................................................................2

3. Installation...................................................................2

4. Wiring ..........................................................................6

5. Example Programs .....................................................6

5.1 Example for CR1000 ................................................................................7

5.2 Example for CR10X .................................................................................7

6. Long Lead Lengths.....................................................8

7. Absolute Humidity......................................................9

8. Maintenance..............................................................11

9. References ................................................................11

Figures

1. CS500 and 41301 Radiation Shield on a CM6/CM10 Tripod Mast ...........3

2. CS500 and 41303 Radiation Shield ............................................................4

3. CS500 and 41003 Radiation Shield on a CM6/CM10 Tripod Mast ...........4

4. Radiation Shield, CS500, and 41381 Adapter ............................................5

5. CS500 Wiring .............................................................................................5

Tables

1. Datalogger Connections..............................................................................6

2. Calibration for Temperature .......................................................................6

3. Calibration for Relative Humidity...............................................................6

4. Wiring for CR1000 and CR10X Examples.................................................7

5. CR10(X) Wiring for Example 1..................................................................9

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RWIS Stations

Campbell Scientific RWIS stations are intended to automatically collect
weather and road information. Standard met sensors are used with surface­specific sensors to measure additional site conditions. As with all Campbell
Scientific stations, these are configurable by the customer to their
requirements.

RWIS stations conform to national standards defined by the National
Transportation Communications for ITS Protocol (NTCIP). They have
developed standards for implementation of several aspects of RWIS. The
NTCIP guide is available at http://www.ntcip.com/library/guide.asp. The
specification that we conform to is ESS-1204. ESS (Environmental Sensor
Station) is a term that refers to the weather station.

Each station that we supply has the following components listed below.

Power enclosure for the batteries:

Equipment enclosure:

AC recharge
DC recharge/tripod for solar panels

CR10X-2M or CR1000
SDM-SIO4
NL110
Modem

In addition to the standard met sensors, there are options that add function to
the station to allow it to make road-related measurements. Some are listed
below. As with any station, if a customer needs another measurement that they
feel is appropriate, it will be added if possible.

SR50 (acoustic snow sensor)
Lufft IRS21 (road sensor – 2 ea generally)
Present weather (such as Vaisala PWD22)
Camera
107 probes for sub surface temperatures

The purpose for the instruments in the equipment enclosure doesn't need a lot
of explanation with the exception of the SDM-SIO4 and the modem.

The SDM-SIO4 is used primarily for interfacing to the IRS21. The handshake
required to communicate with the sensor doesn’t allow for operation with the
CR10X alone since four control ports are required. In addition, many of the
sensors used with this application have serial interfaces making the SDM-SIO4
a good addition to the application.

The modem used needs an RS-232 interface and also needs to be faster than the
9600 baud offered in Campbell modems. This is due to the requirement for
image retrieval from a camera. If using FTP (desired) to extract an image from
the logger, FTP shuts down before the image can be retrieved.

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RWIS Stations

Theory of operation

The NL110 provides communication for all system devices, converts logger
measurements to NTCIP compliant data, routes images from an installed
camera to the logger, provides SNMP communication, and stores text
generated in the CR10X to text values required by NTCIP.

Customers call in through the modem and establish a PPP connection. This
connection makes a private network and has its own IP address.

The NL110 also provides the necessary function for providing NTCIP
compliant data to ANY NTCIP compliant software that can interrogate NTCIP
compliant systems. This makes the RWIS system compatible with other
systems supplied by other manufacturers.

The logger makes all measurements. As they are made, output is generated
that the NL110 accepts. The NL100 then converts the data to NTCIP
compliant values by changing the variable names to variable names that
comply with the specification.

The camera installed outputs an image automatically on a fixed interval. As
the image is sent, it is routed from the camera to the 10 base t input on the
NL110. The NL110 then routes the image to the logger for later use. One
image is stored in the logger, and when a new image is sent, it replaces the
image last sent.

All sensors have their own measurement instructions, but there are some
unique setups for the equipment installed in the ESS. The following pages
describe those setups.

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RWIS Stations

Loggermap

diff
channelsechannel sensor/color function 12v/color AG/color G/color
1 1H humidity

2L Air temp

2 3H open option(oo)

4L wind direction

35H solrad

6L solrad

4 7H sub surface

8L sub surface

5 9H sub surface

10L sub surface

6 11H rain y/n(oo)*

12L rainy/n(oo)*
p1 wind speed
p2 tipping bucket
e1
e2 sub surface
e3 wind direction
c1 sdm-sio4
c2 sdm-sio4
c3 sdm-sio4
c4
c5
c6
c7
c8 snow depth

Logger Setup

The CR10X-2M *D and *A menus set the logger for image collection and pb
operation.

*D15 location 1 is the pakbus address and is set to 1

fill in the remainder of the table with values of 4

*D16 location is the amount of memory to set aside for the image in the logger
and is set to 6

*D18 location is the beacon and is set to 60

*D19 location 01 is set to 17 with nothing after

*A location 6 is set to 3000 for the text values that ess1204 requires

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