Campbell SC32B User manual

INSTRUCTION MANUAL
Issued: 17.3.14
Copyright © 1987-2013 Campbell Scientific Inc.
Printed under Licence by Campbell Scientific Ltd.
CSL 482
SC32B Optically Isolated
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: [email protected]
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: [email protected]
www.campbellsci.co.uk

i
Contents
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1. Function .....................................................................1
2. Specifications ............................................................2
3. Connector Descriptions ............................................2
3.1 RS-232 .................................................................................................2
3.2 9 Pin .....................................................................................................2
4. Operation....................................................................2
5. Application.................................................................3
Figure
1-1. SC32B Optically Isolated RS-232 Interface.........................................1
Table
3-1. SC32B Connector Descriptions ...........................................................2

1
SC32B Optically Isolated RS-232
Interface
1. Function
Figure 1-1. SC32B Optically Isolated RS-232 Interface
The SC32B interfaces an RS-232 peripheral, commonly a computer or terminal, to
the CS I/O port of a Campbell Scientific datalogger. The SC32B has the same
functions as the SC32A. Functions include:
1. Converting datalogger logic levels to RS-232 logic levels.
2. Optically isolating the datalogger and the RS-232 peripheral. Optical
isolation separates the SC32B into a datalogger section and an RS-232
section. Signals entering from either side are electrically independent,
protecting against ground loops, normal static discharge, and noise.
3. Passing data when modem enable pin 5 is high and SDE/printer enable pin 6
is low (normal telecommunications mode).
The SC32B blocks data sent out the datalogger CS I/O port when the SDE/print
enable pin 6 is high. This prevents data sent to an SDE device (for example,
storage module) or printer output from being sent out the RS-232 port. The
SC32B cannot be configured to pass Instruction 96 serial printer or computer data.
Contact Campbell Scientific if this capability is required.

SC32B Optically Isolated RS-232 Interface
2
2. Specifications
Operating Temperature: –25° to +50C (typical)
Power: Powered by datalogger; see Section 4, Operation
Ports: 9 pin female RS-232 configured as DCE.
9 pin male CS I/O
Baud Rate: 1200 bps to 115.2 kbps; see Section 4, Operation
Size: 4.1 x 2.3 x 7.6 cm (1.6 x 0.9 x 3 in)
Weight: 45.4 g (1.6 oz)
3. Connector Descriptions
Table 3-1. SC32B Connector Descriptions
RS-232
9 Pin Female Connector
CS I/O
9 Pin Male Connector
Pin #
I/O
Description
Pin #
I/O
Description
1
Out
DCD
1
In
+5 V
2
Out
RXD
2
Ground
3
In
TXD
3
Out
Ring
4
In
DTR
4
Out
RX
5
Ground
5
In
ME
6
Out
DSR
6
In
PE (SDE)
7
In
RTS
7
No Connection
8
Out
CTS
8
No Connection
9
No Connection
9
In
TX
3.1 RS-232
The DB9 RS-232 port is configured as Data Communications Equipment (DCE)
for direct cable connection to Data Terminal Equipment (DTE). Most computers
are configured as DTE. For connection to DCE devices such as modems, the
SC932 or SC932A should be used in place of the SC32B.
3.2 9 Pin
The CS I/O port connects to the datalogger through the SC12 Two Peripheral
Cable supplied with the SC32B. Pin descriptions and direction (Input/Output) are
given in Table 3-1.
4. Operation
Power for the SC32B datalogger section comes from the 5 V supply on pin 1 of
the datalogger CS I/O. Communication logic levels to and from the datalogger are
referenced to this voltage, ranging from 0 to slightly less than 5 V.

Instruction Manual
3
Power for the RS-232 section is isolated from the datalogger 5 V supply via a
transformer/isolator. An on-board DC to DC converter supplies the negative
voltage required for RS-232 signals.
When the SC32B first receives a character from the RS-232 peripheral (pin 3),
5 V is applied to the datalogger Ring line (pin 3) until the datalogger Modem
Enable (ME) goes high, putting the datalogger into the Telecommunications
Mode.
The SC32B does not perform baud rate translation. The data speed going out will
match the data speed coming in. If you are having trouble communicating, check
that the datalogger’s CS I/O ME baud rate matches that being used by the
computer/LoggerNet. When other devices are also connected to the datalogger’s
CS I/O port, it may be necessary to lower the baud rate used for the SC32B. If
you encounter communication issues, consider starting at 9600. If communication
is successful, you can increase the baud rate until communication problems
return.
5. Application
The SC32B provides a direct interface between the CS I/O port on a Campbell
Scientific datalogger and the RS-232 port on a computer. Some Campbell
Scientific dataloggers (for example, the CR23X and CR5000) have a built-in
RS-232 port in addition to the CS I/O port. With these dataloggers, the SC32B is
only necessary if you wish to connect to the CS I/O port instead of the
RS-232 port.
The SC32B blocks data sent out the CS I/O port when the datalogger sets the
printer enable/SDE (pin 6) high. The SC932 or SC932A (CS I/O to RS-232 DTE
interface) can be used to interface to an RS-232 modem.

SC32B Optically Isolated RS-232 Interface
4

Instruction Manual
5

6
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