Date Code 20010518 Introduction 1-3
SEL-2020 Instruction Manual
LIST OF ACRONYMS, ABBREVIATIONS, AND GLOSSARY TERMS
Acronym/
Abbreviation Definition
ASCII American National Standard Code for Information Interchange
CPU Central Processor Unit
CTS Clear-To-Send
DNP Distributed Network Protocol
EEPROM Electronically Erasable Programmable Read-Only Memory
EIA Electronic Industries Association
ESD Electrostatic Discharge
FID Firmware Identification
Flash Memory Nonvolatile memory (retains data when power is removed)
GOES Geostationary Operational Environmental Satellite
GPS Global Positioning System
HMI Human Machine Interface
IED Intelligent Electronic Device
IRIG-B Inter-Range Instrumentation Group (U.S. Government)
LMD LMD Protocol
LPS Linear Power Supply
LSB Least Significant Bit
MOV Metal Oxide Varistor
MSB Most Significant Bit
Parse To separate an item into its component parts and decide which
parts to keep
PS Power Supply
RTS Request-To-Send
RTU Remote Terminal Unit
RXD Receive
SCADA Supervisory Control and Data Acquisition
TTL Transistor-Transistor Logic (0 Vdc to +5 Vdc)
TXD Transmit
XON Transmit ON character
XOFF Transmit OFF character
INITIAL CHECKOUT
Perform the following steps to ensure that the SEL-2020 communicates:
1. Visually inspect the SEL-2020 for loose or damaged parts.
2. Connect and apply power to the SEL-2020. (See the PWR SUP field on the rear-panel
nameplate for power requirements.) If you do not have the proper voltage source available,
use a power supply, like the SEL-LPS, to power the unit.
3. Press and hold the LED TEST button and confirm that all LEDs illuminate.
4. Connect a terminal (or computer equipped with terminal emulation software) to the front-
panel connector Port F of the SEL-2020 using an SEL-C234A cable or equivalent.
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