Campbell SC105 CS, SC105 User Manual

USER GUIDE

Issued: 30.12.13

Copyright © 2004-2013 Campbell Scientific Inc.

Printed under Licence by Campbell Scientific Ltd.

CSL 36

SC105 CS I/O

to RS-232 Interface

Guarantee

This equipment is guaranteed against defects in materials and workmanship.
This guarantee applies for twelve months from date of delivery. We will repair
or replace products which prove to be defective during the guarantee period
provided they are returned to us prepaid. The guarantee will not apply to:



Equipment which has been modified or altered in any way without the

written permission of Campbell Scientific



Batteries



Any product which has been subjected to misuse, neglect, acts of God or

damage in transit.

Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred

in removing and/or reinstalling equipment. This guarantee and the Company’s

obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.

Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. Quotations for repairs can be given on
request. It is the policy of Campbell Scientific to protect the health of its
employees and provide a safe working environment, in support of this policy a

“Declaration of Hazardous Material and Decontamination” form will be issued

for completion.

When returning equipment, the Repair Reference Number must be clearly

marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy

is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.

Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.

Campbell Scientific Ltd,

Campbell Park, 80 Hathern Road,

Shepshed, Loughborough, LE12 9GX, UK

Tel: [phone]

Fax: [phone]

Email: [e-mail]

www.campbellsci.co.uk

PLEASE READ FIRST

About this manual

Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the
North American market. Some spellings, weights and measures may reflect this origin.

Some useful conversion factors:

Area: 1 in2 (square inch) = 645 mm2

Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km

Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg

Pressure: 1 psi (lb/in2) = 68.95 mb

Volume: 1 UK pint = 568.3 ml
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres

In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.

Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please note,

however, that when a power supply adapter is ordered it will be suitable for use in your country.

Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.

Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.

Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.

Recycling information

At the end of this product’s life it should not be put in commercial or domestic refuse
but sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.

Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.

For further advice or support, please contact Campbell Scientific Ltd, or your local agent.

Campbell Scientific Ltd, Campbell Park, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX, UK

Tel: [phone] Fax: [phone]

Email: [e-mail]

www.campbellsci.co.uk

i

Contents

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

1. General Description ................................................... 1

2. Specifications ............................................................ 2

3. Set-up Menu ............................................................... 3

3.1 Set-up Menu Selections ........................................................................ 4

4. Installation .................................................................. 5

5. RAD Modem Application ........................................... 5

5.1 RAD Modem - Two Way ..................................................................... 6

5.2 RAD Modem Wiring and Grounding ................................................... 6

5.3 Testing RAD Modem Communication ................................................ 7

6. CDMA Modem Application ........................................ 8

7. Freewave Radio Application ..................................... 9

Figures

1-1. SC105 CS I/O to RS-232 Interface ...................................................... 1

3-1. Set-up Menu ......................................................................................... 4

5-1. Two Way Communication ................................................................... 6

5-2. Installation of Spark Gap Protection .................................................... 7

Tables

5-1. Approximate Range, miles and km ...................................................... 6

1

SC105 CS I/O to RS-232 Interface

1. General Description

Figure 1-1. SC105 CS I/O to RS-232 Interface

The SC105 (Figure 1-1) is used to interface a Campbell Scientific datalogger to
any modem that is configured with an RS-232 DCE (Data Communications
Equipment) serial port. The SC105 is an intelligent interface that buffers data
(1 kB buffer size), allowing many RS-232 data rates, and all CS I/O port modes.

Features include:

 True RS-232 signal levels.
 Power for the SC105 is supplied from the 5 V supply on pin 1 of the

datalogger’s CS I/O port. The SC105 will use the 5 V supply to power the
RS-232 modem if needed.

 Two way (interactive) communication.
 Supports most RS-232 baud rates.
 Supports all CS I/O port modes.

The SC105 is frequently used with a short haul modem to communicate across a
dedicated line made of two pairs of twisted wire with a shield. Section 3, Set-up
Menu, describes the details of this application using a short haul modem built by
RAD.

The SC105 is also commonly used with satellite transmitters, cellular modems,
and spread spectrum radios.

The SC105 also supports one-way output or printer communication.

SC105 CS I/O to RS-232 Interface

2

2. Specifications

RS-232 9-Pin Male Connector Pin-out:

Pin No.

I/O

Name

Description

1

In

DCD

Data Carrier Detect (No Connection)

2

In

RXD

Received Data

3

Out

TXD

Transmitted Data

4

Out

DTR

Data Terminal Ready

5 GND

Signal Ground

6

In

DSR

Data Set Ready (No Connection)

7

Out

RTS

Request to Send – Modem Enable

8

In

CTS

Clear to Send

9

In

Ring

Rings Datalogger

CS I/O 9-Pin Male Connector Pin-out:

Pin No.

I/O

Name

Description

1

In

+5 V

Regulated 5 Volt supply

2 GND

Ground

3

Out

Ring

Ring signal to datalogger

4

Out

RXD

SC105 transmits on this line

5

In

ME

Modem Enable—must be high for transfer in
ME mode

6

In

SDE

Synchronous Device Enable

7

In

CLK/HS

Clock/Handshake (for synchronous
communication)

8 +12 V

Not Used

9

In

TXD

SC105 receives on this line

User Guide

3

RS-232 Baud Rates: The SC105 will support the following baud rates:

1200, 9600, 19200, 38400, 57600, and 115200

RS-232 Parity and Data

The SC105 supports the following:
Parity: Even, Odd, None
Data Bits: 7, 8

CS I/O Port Modes: CSDC, SDC, ME, Addressed Print Device for P96

output

Electrical: The SC105 uses power from the +5 V line on the

9-pin interface connected to the datalogger

Current

Standby: 0.16 mA
Communicating: 1 to 4 mA
Additional current (up to 8 mA) from the 5 V

supply may be used by the RS-232 device
connected to the SC105

Physical

Height: 2.3 cm (0.9 in)
Width: 4.1 cm (1.6 in)
Length: 8.9 cm (3.5 in)
Weight: 45.4 g (1.6 oz)

Environmental

Temperature: –25° to +50°C
Humidity: up to 95% non-condensing

3. Set-up Menu

The SC105 has a built-in set-up menu for configuring communication mode, CS
I/O port configuration, RS-232 port configuration, and other parameters. The Set­up Menu is shown in Figure 3-1. It is accessed by connecting the SC105’s RS­232 port to a PC with the included null modem cable. The SC105 also needs to
have power. Usually, the SC105 is powered by connecting the SC105’s CS I/O
port to the CS I/O port of a datalogger.

With the null modem connection to the PC, typically Campbell Scientific’s Device

Configuration Utility (DevConfig) is used, but a terminal program such as
HyperTerminalTM or ProcommTM (always 9600 baud, 8-N-1) can also be used.

Press the Program button on the SC105 for one second to access the Set-up
Menu. Changed settings are saved in flash memory by selecting Apply in
DevConfig or menu item 4 if using HyperTerminal or Procomm. If left idle, the
Set-up Menu will time out 60 seconds after the last received character and exit
without saving any parameter changes with the message “Set-up Timeout.” A
datalogger can remain connected to the CS I/O port (to provide power to SC105)
while setting SC105 parameters on the RS-232 port, although CS I/O
communications would be inactive until exiting the Set-up Menu.

SC105 CS I/O to RS-232 Interface

4

SC105 - SW Version 2.0

Main Menu: Current Configuration

(1) CS I/O Port Configuration [Modem Enable]

(2) RS-232 Port Configuration [9600]

(3) Restore Factory Defaults

(4) Save and Exit

(5) Exit w/o Saving Settings

(9) Help

Enter Choice:

Figure 3-1. Set-up Menu

3.1 Set-up Menu Selections

1) CS I/O Port Configuration

An SC105 may be activated either by the Modem Enable signal or by a
Synchronous Device (SDC) address (7, 8, 9, 10, or 11).

If PakBus Networking is being used, SDC address 7, 8, 10, or 11 should be
selected.

Addressed Print Device is a mode that allows output from the datalogger
when it executes the P96 instruction.

2) RS-232 Port Configuration

RS-232 baud rate, data bits, and parity are configured here, as well as the RS­232 Auto Power Down (APD) Mode. The APD mode should be left enabled,
unless the attached RS-232 device requires power from the
RS-232 lines.

The DTR and RTS Mode setting allows control over how these two lines
behave.

DTR is on pin 4 of the RS-232 connector; RTS is on pin 7.

‘PC/PDA mode’: DTR and RTS are both driven to 5 V.

‘Modem mode’: DTR will be driven to +5 V when the CS I/O interface is

active for Modem Enable, SDC Address 9, and Addressed
Print Device configurations. When the
CS I/O is inactive, DTR will be 0 V.

Additionally, there will be a ‘dead time’ after DTR is
dropped of 2 seconds when data coming in on the RS-232
will be ignored.

User Guide

5

For SDC Address 7, 8, 10, or 11, DTR will always be
driven to +5 V.

RTS will ‘key’ the data; it will be driven (+5 V) 20 ms
prior to data being sent out the RS-232, and remain driven
for 5 seconds after the last data is sent out the RS-232.

‘Custom mode’: This mode is identical to the ‘Modem mode’, except the

delays between RTS HI and data, data and RTS LO, and
the ‘dead time’ are all configurable.

4. Installation

Connect the SC105 to the RS-232 device and to the datalogger with the SC12
9-pin cable (included). If the device has a 25-pin connector, a 9-pin female to
25-pin male adapter is required (pn #15751).

Proper transient protection should be installed to protect the computer and
datalogger in areas where damage due to lightning is possible. If this is a RAD
modem application, see Section 5.2, RAD Modem Wiring and Grounding.

5. RAD Modem Application

The SC105 can be used with a short-range modem to communicate across a
4-wire, unconditioned dedicated line. Campbell Scientific offers a mounting
bracket (pn #6282) that will mount the RAD, SC105, and adapter (pn #15751) to
the back plate in a Campbell Scientific enclosure. This section describes using a
short-range asynchronous modem built by RAD*.

* SRM - 5A RAD Modem
RAD Data Communications, Inc.
900 Corporate Drive
Mahwah, NJ 07430
Tel: [phone]
Fax: [phone]
Email: [e-mail]
www.rad.com

For transmission, the RAD modem uses a cable made of two pairs of twisted wires
with a shield. Data rates up to 9600 bps are possible. The low voltage
transmission levels minimize cross talk between adjacent lines within the same
cable. Data are transmitted and received at a balanced impedance, providing
excellent immunity to circuit noise. Table 5-1 gives the data rate possible for
several gauge cables across several distances.

SC105 CS I/O to RS-232 Interface

6

Table 5-1. Approximate Range, miles and km

Data Rate

19 Gauge (0.9 mm)

24 Gauge (0.5 mm)

26 Gauge (0.4 mm)

bps

miles

km

miles

km

miles

km

9,600

6.2

10.0

2.8

4.5

2.0

3.3

1,200

7.6

12.2

3.4

5.5

2.5

4.0

5.1 RAD Modem – Two Way

4-WIRE UNCONDITIONED

TELEPHONE LINE

OR

TWO TWISTED PAIRS

SRM

9 TO 25 PIN

ADAPTOR

SC105

DATALOGGER

PC

SRM

Figure 5-1. Two Way Communication

When using Campbell Scientific’s datalogger support software to communicate
through the SC105/RAD modem, “Set-up” the link as a direct connect between

the datalogger and the desired COM port. Start two way communication using the
Connect button on the tool bar and the Connect button in the Connect window.

5.2 RAD Modem Wiring and Grounding

Figure 5-2 shows a typical set-up of the RAD modems. Installation is as follows:

1. Set the DCE/DTE switch on the back of the RAD modem connected to the
SC105 to DCE. For a RAD modem connected to a PC, set the DCE/DTE
switch to DCE. For a RAD modem connected to a serial printer, set the
DCE/DTE switch to DTE.

2. Select a cable with two or more twisted pairs. A recommended direct burial
rodent resistant cable is listed below. They also sell several gopher resistant
cables for even greater protection.

Company Part Number AWG.

Anixter F-02P22BPN 22
Tel: [phone]
www.anixter.com

3. Wiring connections are made as shown in Figure 5-2. Note wires labelled A
and B are one twisted pair of the cable. Wires labelled C and D are the other
twisted pair.

4. Transients induced on the communication line may damage any electronics
connected at either end of the line. To decrease the chances for damage,
spark gaps should be installed as shown in Figure 5-2. The transient
protection shown may be purchased from Campbell Scientific (pn #5563
shown in Figure 5-2, pn #6536 includes a plastic case, pn #6361 includes
hardware for mounting to ground lug of Campbell Scientific enclosures
models ENC10/12, ENC12/14, or ENC16/18). Spark gap wiring is straight
through such that pin to pin continuity exists between the two modems. If
the modems are installed entirely within a building, the transient spark gap
protection is probably not needed.

User Guide

7

Figure 5-2. Installation of Spark Gap Protection

Occasionally, a customer needs to transmit data across longer or smaller gage
wires or at higher speeds than can be done with the RAD modem powered by the
SC105. RAD does sell a 9-volt power supply that will boost the signals enough to
meet some of these more demanding applications. Please contact RAD for more
information.

5.3 Testing RAD Modem Communication

The modem communication link is divided into the following three sections:

1) RAD modem computer end, 2) cable from computer modem to datalogger
modem, 3) RAD modem datalogger end. When unable to establish
communication with the datalogger, test each of the three sections.

Before proceeding through the testing procedures, a terminal emulator software
program such as HyperTerminalTM or Campbell Scientific’s datalogger support
software (Test Terminal Emulator) must be used to communicate through the

SC105 CS I/O to RS-232 Interface

8

COM port of the computer. Once the emulator program is set up, testing can
proceed as follows:

1. Disconnect the four conductor cables from the SRM-6A RAD modem at the
computer end. Jumper the XMT + to RCV + and jumper the XMT – to
RCV –. This creates a transmit loop which allows any key pressed at the
computer keyboard to be seen on the screen. If the key pressed is not seen,
check the following: COM port configuration, 25-pin cable from the
computer to the modem, and the RAD modem.

2. Reconnect the four conductor cables to the modem at the computer end and
disconnect the cable from the modem at the datalogger end. Twist together
the XMT + wire and RCV + wire, twist together the XMT – wire and the
RCV – wire. Repeat step 1 by pressing a key on the computer keyboard. If
the key pressed is not returned, then the cable from the modem at the
computer to the datalogger modem is defective and will need to be repaired
or replaced.

3. If steps 1 and 2 pass, the modem at the datalogger is suspect. Disconnect the
modem from the SC105 and bring the modem to the computer site. Attach
the modem to the computer, and repeat step 1 by jumpering the terminals of
the modem and pressing a key on the computer keyboard.

If the above tests pass and communication to the datalogger still has not been
established, perform tests 4, 5, and 6.

4. A 12 V lead acid battery supply should not be discharged below 11.76 V. If
this occurs, the batteries will go into a deep discharge state and will need to
be replaced. The CR10 will function properly on a battery voltage of 10 to
15 volts. Check the 12 V supply with a voltmeter.

5. On the wiring panel of most Campbell Scientific dataloggers there is a
terminal marked 5 V. Check the 5 V supply with a voltmeter. This 5 V
supply should be within a tenth of a volt. If not, it would indicate a problem.

6. To verify that the datalogger and its serial I/O port are working, try to access
input memory locations using a laptop PC with the SC105 (using a null
modem cable connection). Configure the SC105 CS I/O Port to Modem
Enable for this test.

7. If test 6 fails, use a CR10KD Keyboard Display to access input locations.

If the datalogger passes tests 4, 5, and 7, but fails test 6, then the SC105 is suspect
and will need to be repaired or replaced.

6. CDMA Modem Application

In most modem applications, the SC105 can be used with the factory defaults.
This sets the SC105 up as modem enable 9600 baud, 8 data bits, Parity None and
1 stop bit. It also sets the DTR dead time to 2 seconds. This dead time is used to
prevent characters produce by the modem from waking the datalogger right after
communications has been terminated. The dead time can be adjusted by changing
the RS-232 DTR and RTS mode to Custom.

The CS I/O port configuration has several other modes that can be used depending
on the operating system used in the datalogger. These other modes offer
advantages for some applications. When using the PakBus OS, SDC 7, SDC 8,
SDC 10, or SDC 11 can be used. This allows communications from multiple
sources at the same time (for example, CDMA modem, RF400, and CR10KD).

User Guide

9

Valid modes by Operating System:

Modem Enable

SDC 7, SDC 8,

SDC 10, SDC 11

SDC 9

Standard OS (Array)

X

X

Table Data OS

X

PakBus OS X X

7. Freewave Radio Application

Typically, the Freewave radios will be used in a PakBus network, with PakBus OS
dataloggers.

With a PakBus datalogger, the CS I/O port configuration on the SC105 should be
set to SDC 7, SDC 8, SDC 10, or SDC 11. The RS-232 baud rate should be set to
match the baud rate on the Freewave radios (38.4 k or 115 k are good choices).

If the low power modes of the Freewave radios are to be used, the SC105 DTR
and RTS mode setting will need to be configured to compensate for the turn-on
latency of the Freewave radio. The radio uses the RTS signal to go in and out of
its low power mode. The radio requires a delay from the time that it is brought out
of the low power mode and the time it receives data over the RS-232 port.

To do this, the default DTR and RTS mode will have to be changed to Custom
with RTS High = 100, and RTS Low = 20. This gives 100 ms between RTS HI
and data on the RS-232 port, and 2 seconds between data on the RS-232 port and
RTS going LO.

For a detailed application note on using Freewave Radios, see PakBus Networking
with Freewave Radios. This application note gives complete details on the set-up
of the datalogger, the SC105, the Freewave radio, and LoggerNet PC software for
this application.

CAMPBELL SCIENTIFIC COMPANIES

Campbell Scientific, Inc. (CSI)

815 West 1800 North

Logan, Utah 84321
UNITED STATES

www.campbellsci.com  [e-mail]

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Somerset West 7129

SOUTH AFRICA

www.csafrica.co.za  [e-mail]

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Garbutt Post Shop

QLD 4814 AUSTRALIA

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Rua Luisa Crapsi Orsi, 15 Butantã

CEP: 005543-000 São Paulo SP BRAZIL

www.campbellsci.com.br  [e-mail]

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11564 - 149th Street NW

Edmonton, Alberta T5M 1W7

CANADA

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300N Cementerio, Edificio Breller

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Shepshed, Loughborough LE12 9GX

UNITED KINGDOM

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3 Avenue de la Division Leclerc

92160 ANTONY

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Local 1 - 08024 BARCELONA

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Please visit www.campbellsci.com to obtain contact information for your local US or International representative.