4-4 “Job Done” Examples - (Example 1) Date Code 20010518
SEL-2020 Instruction Manual
DEFINING THE SOLUTION
Complete Hardware Connections
1. Connect each SEL-251 Relay as follows:
a. On the relay, install cable SEL-C239 connectors to Port 2R and AUX INPUT.
b. Plug the other end of cable SEL-C239 into the desired SEL-2020 serial port.
2. Connect the IRIG-B time source to the SEL-2020 IRIG-B input. (You need to know if the
time source has a modulated or demodulated IRIG-B signal. Set the IRIG-B jumpers in the
SEL-2020 to match the type of signal.)
3. Connect a telephone line to the phone line connector at Port 8.
4. Connect your computer’s serial port to the SEL-2020’s Port F with an SEL-C234A cable.
Note: You do not need to modify the baud rate of Port 2 at the relay; the SEL-2020 will
match the baud rate during auto-configuration.
Set the SEL-2020
1. Issue the ACCESS and 2ACCESS commands and associated passwords to go to
Access Level 2.
2. Use SET P F to set Port F parameters.
3. Set Port 1 configuration communications options using the SET P 1 command.
4. Use SET A 1 to define a timed trigger condition in the form of (Thh:mm:ss) to send a date
message at a specific time once each day to the relay connected to Port 1.
5. Use the COPY 1 ALL command to copy Port 1 settings to the other ports (2, 3, 4, 5, 6, and 7)
with devices attached.
6. Use SET P 8 to set Port 8 as a modem port.
Verify and Test All Communication Paths
1. Use the STATUS command to check that IRIG-B signal is present and devices are connected
to ports as expected.
2. Check transparent communication with each port. Use PORT n command to enter
transparent communication with Port n, where n is any port number (1-16); use <CTRL-D>
to end transparent communication.
3. Check that all SEL relays are receiving proper IRIG-B signal from the SEL-2020, that all
relays have their Port 2 set to issue auto-messages, and that the relay Port 2 time-out is OFF.
• Enter Transparent Communication with each port, Access Level 1, and issue the IRIG
command.
• Issue the SHO command to check the relay’s AUTO and TIME settings.
• Exit transparent communication using the default disconnect sequence, <CTRL-D>.
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