Campbell Scientific SC932C User Manual
INSTRUCTION MANUAL
SC932C 9-Pin to
RS-232-DCE Interface
Revision: 6/97
Copyright (c) 1997
Campbell Scientific, Inc.
Warranty and Assistance
The SC932C 9-PIN TO RS232-DCE 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 (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.
SC932C 9-Pin to RS232-DCE Interface
Table of Contents
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1. Installation...................................................................1
2. Use with Intelligent Telephone Modems ...................1
3. Other Applications......................................................1
Appendices
A. SC932C to RS232 Device Connection Details......A-1
A.1 Cable for Connection to a 25-Pin DCE Interface.................................A-1
A.2 Cable for Connection to a 9-Pin DCE Interface...................................A-1
B. Technical Details of Special Modes of Operation B-1
B.1 Power Modes........................................................................................B-1
B.2 Handshaking Lines...............................................................................B-1
B.3 ‘Printer Only’ Output ...........................................................................B-1
B.4 Maximum Recall Interval.....................................................................B-2
C. Specifications.........................................................C-1
List of Figures
1. SC932C Connected to RAD Short-Haul Modem........................................1
A-1. Minimum Connections for SC932C to 25-pin DCE Interface ............A-1
A-2. Minimum Connections for SC932C to 9-pin DCE Interface ..............A-1
B-1. Connections for Using SC932C in ‘Printer’ Mode .............................B-2
List of Tables
C-1. 25-Pin Male Connector Pin-out ..........................................................C-2
C-2. 9-Pin Male Connector Pin-out ............................................................C-2
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SC932C 9-PIN TO RS232-DCE INTERFACE
The SC932C is used to interface a Campbell Scientific datalogger to modem devices that are configured
with an RS232 DCE (Data Communications Equipment) serial port. The most common application is to
allow the connection of a RAD short haul modem or third party telephone modem to a datalogger.
The SC932C has the following features:
• Generates true RS232 signal levels to the DCE device, resulting in good noise immunity.
• Powered from the 5V supply of the datalogger, which is also available to provide power to the DCE,
if required for line-powered modems.
• Generates the required ring signal to wake up the datalogger, either when characters are received
or when there is a ring signal from the DCE.
• Allows simultaneous connection of synchronous devices (e.g., Storage Modules) to the datalogger.
• Provides a mechanism for the datalogger to control the line state of intelligent modems via DTR
handshaking control.
• Convenient ‘jumperless’ design.
1. INSTALLATION
Use the SC12 ribbon cable (provided) to
connect the datalogger’s 9-pin CS I/O port to
the 9-pin connector on the SC932C. The
SC932C can usually be connected to the
RS232 device by plugging the SC932C directly
into the serial connector on the RS232 device.
No further configuration is normally required.
A typical application with a RAD modem would
comprise:
SC932C
FIGURE 1. SC932C Connected to RAD
Short-Haul Modem
If the RS232 device does not have a suitable
25-pin ‘D’ socket, you may need an adaptor
cable (see Appendix A).
2. USE WITH INTELLIGENT TELEPHONE MODEMS
prevent the modem staying on-line
unnecessarily, which can lead to excessive
telephone charges and also delay reconnection
to the datalogger.
Most phone modems can be configured to
respond to the DTR line, although this is not
always the default setting. Although this feature
is sometimes controlled by a hardware
configuration switch, more often it is a software
setting, e.g. AT&D2&W is the command for a
Hayes-compatible modem to force the modem
to follow the DTR status.
3. OTHER APPLICATIONS
The SC932C can be used in more specialized
applications. Appendix B gives installation
details where even lower power consumption
may be possible, and also for applications
where higher power outputs for the RS232
device are required.
If an ‘intelligent’ telephone modem is being
used, configure it to allow the SC932C to
control its line status via the DTR line. This can
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