ii General Description Date Code 20010518
SEL-2020 Instruction Manual
SET A - Auto-Message Settings (Ports 1-16) .....................................................................2-13
AUTOBUF ..................................................................................................................2-14
STARTUP ...................................................................................................................2-14
SEND_OPER...............................................................................................................2-14
MSG_CNT ..................................................................................................................2-14
ISSUEn ........................................................................................................................2-14
MESGn ........................................................................................................................2-14
PARSEn.......................................................................................................................2-14
NUMn..........................................................................................................................2-15
DELAYn......................................................................................................................2-15
CHECKn......................................................................................................................2-15
ORDERn......................................................................................................................2-15
STARTn ......................................................................................................................2-15
STOPn .........................................................................................................................2-15
CHKPOSn ...................................................................................................................2-15
ACKn...........................................................................................................................2-15
NACKn........................................................................................................................2-16
ARCH_EN...................................................................................................................2-16
USER...........................................................................................................................2-16
SET U - User-Defined Commands (Ports 1-16)..................................................................2-16
SET M - Data Movement (Ports 1-16)................................................................................2-16
SET L - Logic (Ports 1-16)..................................................................................................2-16
SET C - Calibration.............................................................................................................2-16
“Job Done” Example...................................................................................................................2-17
“Job Done!”.................................................................................................................................2-21
SEL-2020 Robust Design............................................................................................................2-21
Wide Temperature Operating Range...................................................................................2-21
Wide Voltage Range Power Supply....................................................................................2-21
Meets Tough IEEE & IEC Standards..................................................................................2-22
User-Friendly Features................................................................................................................2-22
Auto-Help............................................................................................................................2-22
COPY Command.................................................................................................................2-22
SWAP Command ................................................................................................................2-22
TOGGLE Command ...........................................................................................................2-22
Self-Testing .........................................................................................................................2-22
5 Vdc on Rear Ports ............................................................................................................2-22
Options ........................................................................................................................................2-23
Input/Output Board .............................................................................................................2-23
Internal Modem...................................................................................................................2-23
Nonvolatile Flash Memory..................................................................................................2-23
Applications ................................................................................................................................2-23
Intelligent Port Switch.........................................................................................................2-23
Substation Integrator ...........................................................................................................2-23
SCADA Interface ................................................................................................................2-24
Conclusion ..................................................................................................................................2-24
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