Date Code 20010518 General Description 2-23
SEL-2020 Instruction Manual
OPTIONS
Three options are available to meet additional customer needs:
Input/Output Board
Sixteen opto-isolated input terminals and four output contacts provide additional sensing and
control capability to the SEL-2020. You can set the control input voltage for each input at
48 Vdc (30 - 60 V range), 125 Vdc (80 - 150 V range), or 250 Vdc (150 - 300 V range),
according to the internal jumper you select. Output contacts are trip rated and can be
individually configured as form A or form B using soldered board jumpers.
Internal Modem
The SEL-2020 internally mounted and powered modem is AT command set compatible and
capable of up to 14400 baud communication. The modem uses the Port 8 communication line
with access through an RJ11C modular connection jack on the rear panel. You can configure the
modem for auto-dial or auto-answer.
Nonvolatile Flash Memory
Two megabytes of nonvolatile Flash memory are available with this option. This addition
expands the capabilities of the SEL-2020 to permit long-term data storage without risk of losing
the data if power to the SEL-2020 is turned off.
APPLICATIONS
The SEL-2020's features make it extremely versatile and powerful. The most obvious
applications include:
Intelligent Port Switch
Flexible communications parameters make the SEL-2020 a great choice for almost any port
switching application. The multi-tasking/multi-user capability and data handling capability make
the SEL-2020 more of a self-contained network hub than a port switch, but it is still an
economical choice for port switching applications. The time synchronization capabilities of the
SEL-2020 add to its value in this application.
Substation Integrator
The SEL-2020’s communication processing and database capability are designed to collect and
store data from numerous devices, parse it into useful pieces, and distribute just the needed data
to other devices or systems. This is the fundamental purpose of substation integration, making
the SEL-2020 a natural choice for this application. Its networking capabilities allow it to be the
communication network for small substation integration projects, or it can serve as a sub-network
integrator with one or more ties to a larger substation network.
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