Campbell Scientific SDS122 User Manual
SDS-122 Serial Data Switch
5/99
Copyright © 1996-1999
Campbell Scientific, Inc.
Warranty and Assistance
The SDS-122 SERIAL DATA SWITCH 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 (435) 753-2342. 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.
SDS-122 SERIAL DATA SWITCH
TABLE OF CONTENTS
PDF viewers note: These page numbers refer to the printed version of this document. Use
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1. INTRODUCTION.........................................................................................................................1
2. SPECIFICATIONS.....................................................................................................................1
2.1 Physical......................................................................................................................................1
2.2 Operational.................................................................................................................................2
2.3 Port Configuration/Connections.................................................................................................2
3. INSTALLATION..............................................................................................................................4
4. CONFIGURATION.........................................................................................................................4
4.1 Jumper Configuration.................................................................................................................5
4.2 Special Modes of Operation ......................................................................................................5
4.3 Default Jumper Settings.............................................................................................................8
LIST OF FIGURES
1. General View of SDS-122.....................................................................................................................1
2. Pin Positions for Datalogger Port: 9-way Male ‘D’ Type Connector .....................................................2
3. Pin Positions for Switched Datalogger Port ‘B’: 9-way Female ‘D’ Type Connector ............................3
4. Pin Positions for Switched RS232 Port ‘A’: 25-way Female ‘D’ Type Connector ..............................3
5. Default Jumper Positions on Circuit Board...........................................................................................6
6. SDS-122 Settings for COM200 and SRM-6A (RAD Short Haul Modem).............................................7
LIST OF TABLES
1. Current Consumption in Various Modes/Communication Activity ........................................................2
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SDS-122 SERIAL DATA SWITCH
The SDS-122 is a configurable two-way serial data switch which will allow two modem devices to be
connected to a datalogger simultaneously, so allowing both remote and local interrogation of the
datalogger to be carried out. It can support both DTE and DCE devices without the need for a null
modem cable, and can operate either in manual or automatic mode.
1. INTRODUCTION
The SDS-122 will normally be fitted in a
datalogger enclosure. It allows two modems
to be connected to a single datalogger at the
same time and can automatically switch the
datalogger to communicate with whichever
modem initiates communications.
The SDS-122 can support both DTE and DCE
devices without the need for a null modem
cable, and can emulate an SC932 (9-pin to
RS232-DCE) interface. One port of the SDS122 can also be configured to emulate an
optically isolated SC32A interface in either
DCE or DTE mode. A jumper switch is
provided for use with CR10/10X dataloggers
to block the transmission of synchronous
data.
The SDS-122 can be set either for fully
automatic mode, or manual mode, controlled
by a datalogger control port or any logic
signal. When in automatic mode, the SDS122 can be configured to either hold the last
port rung or to default to a specific port, when
communication finishes on either port.
2. SPECIFICATIONS
2.1 PHYSICAL
Length (over mounting lugs):
195mm
Width (over connectors):
75mm
Height:
22mm
Mounting Holes:
4.8mm dia. (0.1875in) at 177.8mm (7in)
spacing(suitable for mounting onto an
ENC 12/14 enclosure chassis plate)
Weight:
180g
FIGURE 1. General View of SDS-122
1
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