Campbell SC32B User manual

INSTRUCTION MANUAL
SC32B Optically Isolated
RS-232 Interface
Revision: 2/03
Copyright (c) 1987-2003
Campbell Scientific, Inc.

Warranty and Assistance
The SC32B OPTICALLY ISOLATED RS-232 INTERFACE is 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#_____
815 West 1800 North
Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

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SC32B Table of Contents
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1. Function.......................................................................1
2. Specifications .............................................................1
3. Connector Descriptions .............................................2
3.1 RS-232......................................................................................................2
3.2 9 Pin..........................................................................................................2
4. Operation.....................................................................2
5. Application..................................................................3

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1
SC32B Optically Isolated RS-232
Interface
Datalogger
Computer
SN:
SC32B
MadeinUSA
CAMPBELL
SCIENTIFIC,INC.
Logan,Utah
1. Function
The SC32B interfaces an RS-232 peripheral, commonly a computer or
terminal, to the CS I/O of a CSI 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 (e.g., 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 CSI if this capability is required.
2. Specifications
Operating temperature: -25 to +50°C (typical)
Power: Powered by datalogger, see "Operation" section
Ports: 9 pin female RS-232 configured as DCE. 9 pin male CS I/O
Size: 1.6” x 0.9” x 3” (4.1 x 2.3 x 7.6 cm)
Weight: 1.6 oz. (45.4 g)

SC32B Optically Isolated RS-232 Interface
2
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
1OutDCD 1In+5V
2 Out RXD 2 Ground
3InTXD 3OutRing
4InDTR 4OutRX
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.
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.

SC32B Optically Isolated RS-232 Interface
3
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 (e.g., 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
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Campbell Scientific Companies
Campbell Scientific, Inc. (CSI)
815 West 1800 North
Logan, Utah 84321
UNITED STATES
www.campbellsci.com
[e-mail]
Campbell Scientific Africa Pty. Ltd. (CSAf)
PO Box 2450
Somerset West 7129
SOUTH AFRICA
www.csafrica.co.za
[email protected]
Campbell Scientific Australia Pty. Ltd. (CSA)
PO Box 444
Thuringowa Central
QLD 4812 AUSTRALIA
www.campbellsci.com.au
[email protected]m.au
Campbell Scientific do Brazil Ltda. (CSB)
Rua Luisa Crapsi Orsi, 15 Butantã
CEP: 005543-000 São Paulo SP BRAZIL
www.campbellsci.com.br
[e-mail]
Campbell Scientific Canada Corp. (CSC)
11564 - 149th Street NW
Edmonton, Alberta T5M 1W7
CANADA
www.campbellsci.ca
[email protected]
Campbell Scientific Ltd. (CSL)
Campbell Park
80 Hathern Road
Shepshed, Loughborough LE12 9GX
UNITED KINGDOM
www.campbellsci.co.uk
[email protected]k
Campbell Scientific Ltd. (France)
Miniparc du Verger - Bat. H
1, rue de Terre Neuve - Les Ulis
91967 COURTABOEUF CEDEX
FRANCE
www.campbellsci.fr
[e-mail]
Campbell Scientific Spain, S. L.
Psg. Font 14, local 8
08013 Barcelona
SPAIN
www.campbellsci.es
[e-mail]
Please visit www.campbellsci.com to obtain contact information for your local US or International representative.