Date Code 20010518 “Job Done” Examples - (Example 2) 4-17
SEL-2020 Instruction Manual
EXAMPLE 2: PRINT RELAY MESSAGES
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
Optional
Modem
Port 8
(Remote)
Port 7Port 6Port 5Port 4Port 3Port 2Port 1
SEL-2020
Port 2R
Telephone
Line
DWG: 2020_12.vsd
Local
Terminal
Port F
Cable
C234A
Printer with
Serial Port
Port 9
Cable
C223A
Port 2R Port 2R
Port 2R Port 2R Port 2R Port 2R
Figure 4.2: SEL-2020 with Relays and Printers
INTRODUCTION
Example 2 is similar to Example 1, but minor changes and additions have been made to
demonstrate additional SEL-2020 features and capabilities. The cable for the relay connected to
the SEL-2020 Port 7 is replaced with a short-haul modem that supports communication, but not
IRIG-B signal, and a serial printer is added to SEL-2020 Port 9.
IDENTIFYING THE PROBLEM
Your objective in Example 2 is to accomplish the following tasks:
• You want the SEL-2020 to print all unsolicited messages (e.g., summary event reports,
power-up messages) that are generated by the relays connected to the SEL-2020.
• You want to time-synchronize the clock/calendars on all of the connected relays, including
one that cannot accept IRIG-B because it is remotely connected through short-haul
modems.
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