4-18 “Job Done” Examples - (Example 2) Date Code 20010518
SEL-2020 Instruction Manual
DEFINING THE SOLUTION
Complete Hardware Connections
1. Configure each SEL-251 Relay as in Example 1, except for the following:
• The SEL-251 on Port 7 is now connected through short-haul modems. Consequently,
there is no IRIG-B connection and we must supply the time using an ASCII command.
2. The computer connected to Port F and the configuration of Port F remain as in Example 1.
3. Connect a serial port printer to SEL-2020 Port 9 using an SEL-C223A cable or equivalent.
Ports 1 through 8 of the SEL-2020 remain configured as in Example 1.
Set the SEL-2020
1. Set SEL-2020 Port 7 to send a time and date command to the relay.
2. Use the SET P command to configure Port 9 as a printer port.
3. Use the SET A command to enable printing of unsolicited messages on Port 9 and clear the
buffers after printing.
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. Also use the WHO command to see a list of connected devices.
2. Test the connection with each port using the PORT command to enter transparent
communication. Check the connection with the printer by sending a message to Port 9. Use
the default disconnect sequence <CTRL-D> to terminate transparent communication.
3. Use the TOGGLE command to issue the time and date command to the relay on Port 7.
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