Date Code 20010518 Introduction 1-1
SEL-2020 Instruction Manual
SECTION 1: INTRODUCTION
Section 1 provides you with a useful introduction to this manual and to the SEL-2020
Communications Processor. This section includes four parts: an Overview of the Manual; a List
of Acronyms, Abbreviations, and Glossary Terms; Procedure for Initial Checkout; and an
SEL-2020 Data Sheet with specifications.
We, the employee owners of Schweitzer Engineering Laboratories, Inc., are dedicated to making
electric power safer, more reliable, and more economical. The SEL-2020 Communications
Processor is designed to meet that goal.
We appreciate your interest in SEL products and we are dedicated to making sure you are
satisfied. If you have any questions about the SEL-2020 or the manual, please contact us at :
Schweitzer Engineering Laboratories, Inc.
2350 NE Hopkins Court
Pullman, WA USA 99163-5603
Tel: (509) 332-1890
Fax: (509) 332-7990
We guarantee prompt, courteous, and professional service.
We appreciate any comments and suggestions about new products or product improvements that
would help us make your job easier.
OVERVIEW OF THE MANUAL
Background Information
This manual is designed to help you make the most effective use of the SEL-2020
Communications Processor, from the most basic to the most advanced applications. Each section
begins with a detailed table of contents followed by a short paragraph summarizing the main
areas of the section. The manual also includes the following helpful aids:
• Cross-references.
• Sample screens with notations
• Numbered steps for sequential instructions and diamond-shaped bullets for nonsequential
instructions.
• Many explanatory figures, tables, and illustrations.
• Caution symbols to ensure your safety and the protection of the equipment.
• Pull-out lists on SEL-2020 commands and on special characters and pre-defined strings.
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