Campbell Scientific SC932A User Manual
INSTRUCTION MANUAL
SC932A 9-Pin to
RS-232-DCE Interface
Revision: 2/04
Copyright (c) 1987-2004
Campbell Scientific, Inc.
Warranty and Assistance
The SC932A 9-PIN TO RS-232-DCE INTERFACE is warranted by
CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and
workmanship under nor mal use and service for twelve (12) months from date of
shipment unless specifi ed 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 wi thin their territories. Please visi t 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.
SC932A Table of Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.
1. General Description ....................................................1
2. Specifications .............................................................2
3. Installation...................................................................3
4. RAD Modem Application ............................................3
4.1 RAD Modem - Two Way..........................................................................4
4.2 RAD Modem Wiring and Grounding........................................................4
4.3 Testing RAD Modem Communication.....................................................6
Figures
1. SC932A 9-Pin to RS-232-DCE Interface....................................................1
2. Two Way Communication..........................................................................4
3. Installation of Spark Gap Protection...........................................................5
Table
1. Approximate Range, miles and km.............................................................4
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SC932A 9-Pin to RS-232-DCE Interface
CAMPBELL
SCIENTIFIC,INC.
Logan,Utah
Datalogger
SC932A
DCEDevice
MadeinUSA
SN:
FIGURE 1. SC932A 9-Pin to RS-232-DCE Interface
1. General Description
The SC932A (Figure 1) is used to interface a CSI datalogger to any modem that
is configured with an RS-232 DCE (Data Communications Equipment) serial
port. Features include:
• True RS-232 signal levels.
• Power for the SC932A is supplied from the 5 V supply on pin 1 of the
datalogger’s I/O port. The SC932A will use the 5 V supply to power the
RS-232 modem if needed.
• Two way (interactive) communication.
The SC932A is frequently used with a short haul modem to communicate
across a dedicated line made of 2 pairs of twisted wire with a shield. Section 3
describes the details of this application using a short haul modem built by RAD.
The SC932A is also commonly used with the satellite transmitters, cellular
modems, and spread spectrum radios.
The SC932A does not support one way output or printer communication. Data
transfer is blocked when pin 6 from the datalogger is high (SDE/printer enable).
1
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