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10-4
Maintenance
Date Code 20010518
SEL-2020 Instruction Manual
Table 10.3: Communications Problems
Symptom
Probable Cause
Corrective Action
SEL-2020 does not
communicate with PC.
Serial cable damaged or wrong
cable connected.
Inspect the cabling for damage and
proper connection.
SEL-2020 baud rate default
jumper installed.
1. Set the PC terminal to 2400 baud
to communicate with the
SEL-2020.
2. Using the SET command, set the
SEL-2020 baud rate.
3. Access the main board using
steps 1 through 4 in Battery
Replacement section.
4. Remove jumper JMP9 A (see
Figure 3.2). Place the jumper on
one pin of the connector for safe
keeping.
5. Set the baud rate of the
PC terminal to match the
SEL-2020.
6. Cycle SEL-2020 power and
reconnect.
Port and baud rate settings of PC
may be incorrect.
Set the port and baud rate settings of
the PC terminal to match the
SEL-2020. If you do not know what
the settings are, install the baud rate
jumper and then make the settings.
SEL-2020 does not
communicate with
connected IED.
Serial cable damaged or wrong
cable connected.
Inspect the cabling for damage and
proper connection. Make sure
appropriate cable is connected (see
Table 3.2).
Port settings do not match the
IED settings.
Using the SET command, set the port
settings to match those of the IED
connected to the port.
Port may be locked up due to
hardware handshaking.
Reset IED and/or reset port settings
using SET P and accepting settings.
Component failure. Port F
LED(s) illuminates but others do
not illuminate when port is
addressed.
Remove power and contact the factory.
SEL-2020 F
IRMWARE
U
PGRADES
SEL may occasionally offer upgrades to improve the performance of this device. To install
firmware upgrades, refer to the instructions supplied with the firmware upgrades.
Summary of Contents for SEL-2020
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